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[85.229.40.155]) by smtp.gmail.com with ESMTPSA id z1sm6666242edq.54.2021.12.20.04.25.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Dec 2021 04:25:23 -0800 (PST) From: Anders Roxell To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, woojung.huh@microchip.com, UNGLinuxDriver@microchip.com, davem@davemloft.net, netdev@vger.kernel.org, linux-usb@vger.kernel.org, clang-built-linux@googlegroups.com, ulli.kroll@googlemail.com, linux@armlinux.org.uk, linux-arm-kernel@lists.infradead.org, amitkarwar@gmail.com, nishants@marvell.com, gbhat@marvell.com, huxinming820@gmail.com, kvalo@codeaurora.org, linux-wireless@vger.kernel.org, rostedt@goodmis.org, mingo@redhat.com, dmitry.torokhov@gmail.com, ndesaulniers@google.com, nathan@kernel.org, linux-input@vger.kernel.org, Nathan Chancellor , Anders Roxell Subject: [PATCH 4.14 1/6] net: lan78xx: Avoid unnecessary self assignment Date: Mon, 20 Dec 2021 13:25:01 +0100 Message-Id: <20211220122506.3631672-2-anders.roxell@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211220122506.3631672-1-anders.roxell@linaro.org> References: <20211220122506.3631672-1-anders.roxell@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Nathan Chancellor commit 94e7c844990f0db92418586b107be135b4963b66 upstream. Clang warns when a variable is assigned to itself. drivers/net/usb/lan78xx.c:940:11: warning: explicitly assigning value of variable of type 'u32' (aka 'unsigned int') to itself [-Wself-assign] offset = offset; ~~~~~~ ^ ~~~~~~ 1 warning generated. Reorder the if statement to acheive the same result and avoid a self assignment warning. Link: https://github.com/ClangBuiltLinux/linux/issues/129 Signed-off-by: Nathan Chancellor Signed-off-by: David S. Miller Signed-off-by: Anders Roxell --- drivers/net/usb/lan78xx.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c index 838b6fe9dfaa..e286188b6ea1 100644 --- a/drivers/net/usb/lan78xx.c +++ b/drivers/net/usb/lan78xx.c @@ -920,11 +920,9 @@ static int lan78xx_read_otp(struct lan78xx_net *dev, u32 offset, ret = lan78xx_read_raw_otp(dev, 0, 1, &sig); if (ret == 0) { - if (sig == OTP_INDICATOR_1) - offset = offset; - else if (sig == OTP_INDICATOR_2) + if (sig == OTP_INDICATOR_2) offset += 0x100; - else + else if (sig != OTP_INDICATOR_1) ret = -EINVAL; if (!ret) ret = lan78xx_read_raw_otp(dev, offset, length, data); From patchwork Mon Dec 20 12:25:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anders Roxell X-Patchwork-Id: 526306 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B1AC4C43217 for ; Mon, 20 Dec 2021 12:25:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232662AbhLTMZi (ORCPT ); Mon, 20 Dec 2021 07:25:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57040 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232589AbhLTMZc (ORCPT ); Mon, 20 Dec 2021 07:25:32 -0500 Received: from mail-ed1-x52b.google.com (mail-ed1-x52b.google.com [IPv6:2a00:1450:4864:20::52b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CADF6C061747 for ; Mon, 20 Dec 2021 04:25:26 -0800 (PST) Received: by mail-ed1-x52b.google.com with SMTP id y22so37642499edq.2 for ; Mon, 20 Dec 2021 04:25:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=T/8LJRgZvz6xLlkqDCeJ4cjJNm0uXZzaYpYyxO0JE80=; b=MpTcWqSqCzceCxeUNSeKDODUwUx2jYL+Qck7+AkZE9HTTLl+++tBkDGFbhLXKVsSqP uFwQKsNCYvsMe+ojoShDqHyeDzWF7gj5mrcMYbM+Au9Q33usu8QqCi0GeQVH/mgMi1y+ gwhjWJfXm5AlXfVtA7EbxC/AuffB89bKloPNc9vhsHTbb9DCC9t24Z8NUu2EBTW7PN7L fveDMoVpwyVU5502ww1qG2YwUDk71EosEMTJc+nGWP3VQTTJbFg+EzLwRHhefbETkgYW gwZSkJDgoVu23r2OyYD5BO1ZA1T4EsNzgMxDXnrMwxB22GGyB5IT1W8H/9xJ7mwaTPkd Ttiw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=T/8LJRgZvz6xLlkqDCeJ4cjJNm0uXZzaYpYyxO0JE80=; b=IgjfXcovOFi933XIh/sXZtyxUJGAe2esR7egLPnuoD6NG86PfwyNzqioIAz2T84M4j C+UWfS4tpR2mAWLWCjzc74c/80bivlyc4xuvZRUn8HJqQ2/l7JD0cyWPvPFLW68nm1p0 zzDmzDP7k/8TuALZlAWajk2Uvfky1BYbfCuTafFSjYvhe6rClddHcPssLMH6FmIwizGu JjBwyDP+g5AGUuPAYglsyJKaAim9qsXdi2JKjeQ85qkKxoqQB1/liuf2jsG8KwJOCmKk +v6BzX2IfT+rEBRFzvF4SVaYn+wqt8ajL5ZytfGK2WN/WfP563GR6vHQ7vCmwVIV8Wgv /riQ== X-Gm-Message-State: AOAM533YdBv0IpbHeTvnfC6N6isyefKXQ9MipsrLML8l5koHKFWwCkCF mF4HI1XrwW4jtTYD6ufkVRsBTQ== X-Google-Smtp-Source: ABdhPJxOSdx4kSWl3Fh3O9FSAKdkpnh4Q3iNR6FW02xLmteOhYQ3ogPO7p5EWskfJd2Vf10Z+IeG3A== X-Received: by 2002:aa7:cb1a:: with SMTP id s26mr15727768edt.19.1640003125090; Mon, 20 Dec 2021 04:25:25 -0800 (PST) Received: from localhost (c-9b28e555.07-21-73746f28.bbcust.telenor.se. [85.229.40.155]) by smtp.gmail.com with ESMTPSA id mr38sm4691638ejc.109.2021.12.20.04.25.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Dec 2021 04:25:24 -0800 (PST) From: Anders Roxell To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, woojung.huh@microchip.com, UNGLinuxDriver@microchip.com, davem@davemloft.net, netdev@vger.kernel.org, linux-usb@vger.kernel.org, clang-built-linux@googlegroups.com, ulli.kroll@googlemail.com, linux@armlinux.org.uk, linux-arm-kernel@lists.infradead.org, amitkarwar@gmail.com, nishants@marvell.com, gbhat@marvell.com, huxinming820@gmail.com, kvalo@codeaurora.org, linux-wireless@vger.kernel.org, rostedt@goodmis.org, mingo@redhat.com, dmitry.torokhov@gmail.com, ndesaulniers@google.com, nathan@kernel.org, linux-input@vger.kernel.org, Nicolas Pitre , Nicolas Pitre , Stefan Agner , Russell King , Anders Roxell Subject: [PATCH 4.14 2/6] ARM: 8805/2: remove unneeded naked function usage Date: Mon, 20 Dec 2021 13:25:02 +0100 Message-Id: <20211220122506.3631672-3-anders.roxell@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211220122506.3631672-1-anders.roxell@linaro.org> References: <20211220122506.3631672-1-anders.roxell@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Nicolas Pitre commit b99afae1390140f5b0039e6b37a7380de31ae874 upstream. The naked attribute is known to confuse some old gcc versions when function arguments aren't explicitly listed as inline assembly operands despite the gcc documentation. That resulted in commit 9a40ac86152c ("ARM: 6164/1: Add kto and kfrom to input operands list."). Yet that commit has problems of its own by having assembly operand constraints completely wrong. If the generated code has been OK since then, it is due to luck rather than correctness. So this patch also provides proper assembly operand constraints, and removes two instances of redundant register usages in the implementation while at it. Inspection of the generated code with this patch doesn't show any obvious quality degradation either, so not relying on __naked at all will make the code less fragile, and avoid some issues with clang. The only remaining __naked instances (excluding the kprobes test cases) are exynos_pm_power_up_setup(), tc2_pm_power_up_setup() and cci_enable_port_for_self(. But in the first two cases, only the function address is used by the compiler with no chance of inlining it by mistake, and the third case is called from assembly code only. And the fact that no stack is available when the corresponding code is executed does warrant the __naked usage in those cases. Signed-off-by: Nicolas Pitre Reviewed-by: Stefan Agner Tested-by: Stefan Agner Signed-off-by: Russell King Signed-off-by: Anders Roxell --- arch/arm/mm/copypage-fa.c | 35 ++++++------ arch/arm/mm/copypage-feroceon.c | 98 ++++++++++++++++----------------- arch/arm/mm/copypage-v4mc.c | 19 +++---- arch/arm/mm/copypage-v4wb.c | 41 +++++++------- arch/arm/mm/copypage-v4wt.c | 37 ++++++------- arch/arm/mm/copypage-xsc3.c | 71 +++++++++++------------- arch/arm/mm/copypage-xscale.c | 71 ++++++++++++------------ 7 files changed, 178 insertions(+), 194 deletions(-) diff --git a/arch/arm/mm/copypage-fa.c b/arch/arm/mm/copypage-fa.c index d130a5ece5d5..bf24690ec83a 100644 --- a/arch/arm/mm/copypage-fa.c +++ b/arch/arm/mm/copypage-fa.c @@ -17,26 +17,25 @@ /* * Faraday optimised copy_user_page */ -static void __naked -fa_copy_user_page(void *kto, const void *kfrom) +static void fa_copy_user_page(void *kto, const void *kfrom) { - asm("\ - stmfd sp!, {r4, lr} @ 2\n\ - mov r2, %0 @ 1\n\ -1: ldmia r1!, {r3, r4, ip, lr} @ 4\n\ - stmia r0, {r3, r4, ip, lr} @ 4\n\ - mcr p15, 0, r0, c7, c14, 1 @ 1 clean and invalidate D line\n\ - add r0, r0, #16 @ 1\n\ - ldmia r1!, {r3, r4, ip, lr} @ 4\n\ - stmia r0, {r3, r4, ip, lr} @ 4\n\ - mcr p15, 0, r0, c7, c14, 1 @ 1 clean and invalidate D line\n\ - add r0, r0, #16 @ 1\n\ - subs r2, r2, #1 @ 1\n\ + int tmp; + + asm volatile ("\ +1: ldmia %1!, {r3, r4, ip, lr} @ 4\n\ + stmia %0, {r3, r4, ip, lr} @ 4\n\ + mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ + add %0, %0, #16 @ 1\n\ + ldmia %1!, {r3, r4, ip, lr} @ 4\n\ + stmia %0, {r3, r4, ip, lr} @ 4\n\ + mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ + add %0, %0, #16 @ 1\n\ + subs %2, %2, #1 @ 1\n\ bne 1b @ 1\n\ - mcr p15, 0, r2, c7, c10, 4 @ 1 drain WB\n\ - ldmfd sp!, {r4, pc} @ 3" - : - : "I" (PAGE_SIZE / 32)); + mcr p15, 0, %2, c7, c10, 4 @ 1 drain WB" + : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp) + : "2" (PAGE_SIZE / 32) + : "r3", "r4", "ip", "lr"); } void fa_copy_user_highpage(struct page *to, struct page *from, diff --git a/arch/arm/mm/copypage-feroceon.c b/arch/arm/mm/copypage-feroceon.c index 49ee0c1a7209..cc819732d9b8 100644 --- a/arch/arm/mm/copypage-feroceon.c +++ b/arch/arm/mm/copypage-feroceon.c @@ -13,58 +13,56 @@ #include #include -static void __naked -feroceon_copy_user_page(void *kto, const void *kfrom) +static void feroceon_copy_user_page(void *kto, const void *kfrom) { - asm("\ - stmfd sp!, {r4-r9, lr} \n\ - mov ip, %2 \n\ -1: mov lr, r1 \n\ - ldmia r1!, {r2 - r9} \n\ - pld [lr, #32] \n\ - pld [lr, #64] \n\ - pld [lr, #96] \n\ - pld [lr, #128] \n\ - pld [lr, #160] \n\ - pld [lr, #192] \n\ - pld [lr, #224] \n\ - stmia r0, {r2 - r9} \n\ - ldmia r1!, {r2 - r9} \n\ - mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ - add r0, r0, #32 \n\ - stmia r0, {r2 - r9} \n\ - ldmia r1!, {r2 - r9} \n\ - mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ - add r0, r0, #32 \n\ - stmia r0, {r2 - r9} \n\ - ldmia r1!, {r2 - r9} \n\ - mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ - add r0, r0, #32 \n\ - stmia r0, {r2 - r9} \n\ - ldmia r1!, {r2 - r9} \n\ - mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ - add r0, r0, #32 \n\ - stmia r0, {r2 - r9} \n\ - ldmia r1!, {r2 - r9} \n\ - mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ - add r0, r0, #32 \n\ - stmia r0, {r2 - r9} \n\ - ldmia r1!, {r2 - r9} \n\ - mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ - add r0, r0, #32 \n\ - stmia r0, {r2 - r9} \n\ - ldmia r1!, {r2 - r9} \n\ - mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ - add r0, r0, #32 \n\ - stmia r0, {r2 - r9} \n\ - subs ip, ip, #(32 * 8) \n\ - mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ - add r0, r0, #32 \n\ + int tmp; + + asm volatile ("\ +1: ldmia %1!, {r2 - r7, ip, lr} \n\ + pld [%1, #0] \n\ + pld [%1, #32] \n\ + pld [%1, #64] \n\ + pld [%1, #96] \n\ + pld [%1, #128] \n\ + pld [%1, #160] \n\ + pld [%1, #192] \n\ + stmia %0, {r2 - r7, ip, lr} \n\ + ldmia %1!, {r2 - r7, ip, lr} \n\ + mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ + add %0, %0, #32 \n\ + stmia %0, {r2 - r7, ip, lr} \n\ + ldmia %1!, {r2 - r7, ip, lr} \n\ + mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ + add %0, %0, #32 \n\ + stmia %0, {r2 - r7, ip, lr} \n\ + ldmia %1!, {r2 - r7, ip, lr} \n\ + mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ + add %0, %0, #32 \n\ + stmia %0, {r2 - r7, ip, lr} \n\ + ldmia %1!, {r2 - r7, ip, lr} \n\ + mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ + add %0, %0, #32 \n\ + stmia %0, {r2 - r7, ip, lr} \n\ + ldmia %1!, {r2 - r7, ip, lr} \n\ + mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ + add %0, %0, #32 \n\ + stmia %0, {r2 - r7, ip, lr} \n\ + ldmia %1!, {r2 - r7, ip, lr} \n\ + mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ + add %0, %0, #32 \n\ + stmia %0, {r2 - r7, ip, lr} \n\ + ldmia %1!, {r2 - r7, ip, lr} \n\ + mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ + add %0, %0, #32 \n\ + stmia %0, {r2 - r7, ip, lr} \n\ + subs %2, %2, #(32 * 8) \n\ + mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ + add %0, %0, #32 \n\ bne 1b \n\ - mcr p15, 0, ip, c7, c10, 4 @ drain WB\n\ - ldmfd sp!, {r4-r9, pc}" - : - : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE)); + mcr p15, 0, %2, c7, c10, 4 @ drain WB" + : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp) + : "2" (PAGE_SIZE) + : "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr"); } void feroceon_copy_user_highpage(struct page *to, struct page *from, diff --git a/arch/arm/mm/copypage-v4mc.c b/arch/arm/mm/copypage-v4mc.c index 1267e64133b9..db624170854a 100644 --- a/arch/arm/mm/copypage-v4mc.c +++ b/arch/arm/mm/copypage-v4mc.c @@ -40,12 +40,11 @@ static DEFINE_RAW_SPINLOCK(minicache_lock); * instruction. If your processor does not supply this, you have to write your * own copy_user_highpage that does the right thing. */ -static void __naked -mc_copy_user_page(void *from, void *to) +static void mc_copy_user_page(void *from, void *to) { - asm volatile( - "stmfd sp!, {r4, lr} @ 2\n\ - mov r4, %2 @ 1\n\ + int tmp; + + asm volatile ("\ ldmia %0!, {r2, r3, ip, lr} @ 4\n\ 1: mcr p15, 0, %1, c7, c6, 1 @ 1 invalidate D line\n\ stmia %1!, {r2, r3, ip, lr} @ 4\n\ @@ -55,13 +54,13 @@ mc_copy_user_page(void *from, void *to) mcr p15, 0, %1, c7, c6, 1 @ 1 invalidate D line\n\ stmia %1!, {r2, r3, ip, lr} @ 4\n\ ldmia %0!, {r2, r3, ip, lr} @ 4\n\ - subs r4, r4, #1 @ 1\n\ + subs %2, %2, #1 @ 1\n\ stmia %1!, {r2, r3, ip, lr} @ 4\n\ ldmneia %0!, {r2, r3, ip, lr} @ 4\n\ - bne 1b @ 1\n\ - ldmfd sp!, {r4, pc} @ 3" - : - : "r" (from), "r" (to), "I" (PAGE_SIZE / 64)); + bne 1b @ " + : "+&r" (from), "+&r" (to), "=&r" (tmp) + : "2" (PAGE_SIZE / 64) + : "r2", "r3", "ip", "lr"); } void v4_mc_copy_user_highpage(struct page *to, struct page *from, diff --git a/arch/arm/mm/copypage-v4wb.c b/arch/arm/mm/copypage-v4wb.c index 067d0fdd630c..cd3e165afeed 100644 --- a/arch/arm/mm/copypage-v4wb.c +++ b/arch/arm/mm/copypage-v4wb.c @@ -22,29 +22,28 @@ * instruction. If your processor does not supply this, you have to write your * own copy_user_highpage that does the right thing. */ -static void __naked -v4wb_copy_user_page(void *kto, const void *kfrom) +static void v4wb_copy_user_page(void *kto, const void *kfrom) { - asm("\ - stmfd sp!, {r4, lr} @ 2\n\ - mov r2, %2 @ 1\n\ - ldmia r1!, {r3, r4, ip, lr} @ 4\n\ -1: mcr p15, 0, r0, c7, c6, 1 @ 1 invalidate D line\n\ - stmia r0!, {r3, r4, ip, lr} @ 4\n\ - ldmia r1!, {r3, r4, ip, lr} @ 4+1\n\ - stmia r0!, {r3, r4, ip, lr} @ 4\n\ - ldmia r1!, {r3, r4, ip, lr} @ 4\n\ - mcr p15, 0, r0, c7, c6, 1 @ 1 invalidate D line\n\ - stmia r0!, {r3, r4, ip, lr} @ 4\n\ - ldmia r1!, {r3, r4, ip, lr} @ 4\n\ - subs r2, r2, #1 @ 1\n\ - stmia r0!, {r3, r4, ip, lr} @ 4\n\ - ldmneia r1!, {r3, r4, ip, lr} @ 4\n\ + int tmp; + + asm volatile ("\ + ldmia %1!, {r3, r4, ip, lr} @ 4\n\ +1: mcr p15, 0, %0, c7, c6, 1 @ 1 invalidate D line\n\ + stmia %0!, {r3, r4, ip, lr} @ 4\n\ + ldmia %1!, {r3, r4, ip, lr} @ 4+1\n\ + stmia %0!, {r3, r4, ip, lr} @ 4\n\ + ldmia %1!, {r3, r4, ip, lr} @ 4\n\ + mcr p15, 0, %0, c7, c6, 1 @ 1 invalidate D line\n\ + stmia %0!, {r3, r4, ip, lr} @ 4\n\ + ldmia %1!, {r3, r4, ip, lr} @ 4\n\ + subs %2, %2, #1 @ 1\n\ + stmia %0!, {r3, r4, ip, lr} @ 4\n\ + ldmneia %1!, {r3, r4, ip, lr} @ 4\n\ bne 1b @ 1\n\ - mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB\n\ - ldmfd sp!, {r4, pc} @ 3" - : - : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE / 64)); + mcr p15, 0, %1, c7, c10, 4 @ 1 drain WB" + : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp) + : "2" (PAGE_SIZE / 64) + : "r3", "r4", "ip", "lr"); } void v4wb_copy_user_highpage(struct page *to, struct page *from, diff --git a/arch/arm/mm/copypage-v4wt.c b/arch/arm/mm/copypage-v4wt.c index b85c5da2e510..8614572e1296 100644 --- a/arch/arm/mm/copypage-v4wt.c +++ b/arch/arm/mm/copypage-v4wt.c @@ -20,27 +20,26 @@ * dirty data in the cache. However, we do have to ensure that * subsequent reads are up to date. */ -static void __naked -v4wt_copy_user_page(void *kto, const void *kfrom) +static void v4wt_copy_user_page(void *kto, const void *kfrom) { - asm("\ - stmfd sp!, {r4, lr} @ 2\n\ - mov r2, %2 @ 1\n\ - ldmia r1!, {r3, r4, ip, lr} @ 4\n\ -1: stmia r0!, {r3, r4, ip, lr} @ 4\n\ - ldmia r1!, {r3, r4, ip, lr} @ 4+1\n\ - stmia r0!, {r3, r4, ip, lr} @ 4\n\ - ldmia r1!, {r3, r4, ip, lr} @ 4\n\ - stmia r0!, {r3, r4, ip, lr} @ 4\n\ - ldmia r1!, {r3, r4, ip, lr} @ 4\n\ - subs r2, r2, #1 @ 1\n\ - stmia r0!, {r3, r4, ip, lr} @ 4\n\ - ldmneia r1!, {r3, r4, ip, lr} @ 4\n\ + int tmp; + + asm volatile ("\ + ldmia %1!, {r3, r4, ip, lr} @ 4\n\ +1: stmia %0!, {r3, r4, ip, lr} @ 4\n\ + ldmia %1!, {r3, r4, ip, lr} @ 4+1\n\ + stmia %0!, {r3, r4, ip, lr} @ 4\n\ + ldmia %1!, {r3, r4, ip, lr} @ 4\n\ + stmia %0!, {r3, r4, ip, lr} @ 4\n\ + ldmia %1!, {r3, r4, ip, lr} @ 4\n\ + subs %2, %2, #1 @ 1\n\ + stmia %0!, {r3, r4, ip, lr} @ 4\n\ + ldmneia %1!, {r3, r4, ip, lr} @ 4\n\ bne 1b @ 1\n\ - mcr p15, 0, r2, c7, c7, 0 @ flush ID cache\n\ - ldmfd sp!, {r4, pc} @ 3" - : - : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE / 64)); + mcr p15, 0, %2, c7, c7, 0 @ flush ID cache" + : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp) + : "2" (PAGE_SIZE / 64) + : "r3", "r4", "ip", "lr"); } void v4wt_copy_user_highpage(struct page *to, struct page *from, diff --git a/arch/arm/mm/copypage-xsc3.c b/arch/arm/mm/copypage-xsc3.c index 03a2042aced5..55cbc3a89d85 100644 --- a/arch/arm/mm/copypage-xsc3.c +++ b/arch/arm/mm/copypage-xsc3.c @@ -21,53 +21,46 @@ /* * XSC3 optimised copy_user_highpage - * r0 = destination - * r1 = source * * The source page may have some clean entries in the cache already, but we * can safely ignore them - break_cow() will flush them out of the cache * if we eventually end up using our copied page. * */ -static void __naked -xsc3_mc_copy_user_page(void *kto, const void *kfrom) +static void xsc3_mc_copy_user_page(void *kto, const void *kfrom) { - asm("\ - stmfd sp!, {r4, r5, lr} \n\ - mov lr, %2 \n\ - \n\ - pld [r1, #0] \n\ - pld [r1, #32] \n\ -1: pld [r1, #64] \n\ - pld [r1, #96] \n\ + int tmp; + + asm volatile ("\ + pld [%1, #0] \n\ + pld [%1, #32] \n\ +1: pld [%1, #64] \n\ + pld [%1, #96] \n\ \n\ -2: ldrd r2, [r1], #8 \n\ - mov ip, r0 \n\ - ldrd r4, [r1], #8 \n\ - mcr p15, 0, ip, c7, c6, 1 @ invalidate\n\ - strd r2, [r0], #8 \n\ - ldrd r2, [r1], #8 \n\ - strd r4, [r0], #8 \n\ - ldrd r4, [r1], #8 \n\ - strd r2, [r0], #8 \n\ - strd r4, [r0], #8 \n\ - ldrd r2, [r1], #8 \n\ - mov ip, r0 \n\ - ldrd r4, [r1], #8 \n\ - mcr p15, 0, ip, c7, c6, 1 @ invalidate\n\ - strd r2, [r0], #8 \n\ - ldrd r2, [r1], #8 \n\ - subs lr, lr, #1 \n\ - strd r4, [r0], #8 \n\ - ldrd r4, [r1], #8 \n\ - strd r2, [r0], #8 \n\ - strd r4, [r0], #8 \n\ +2: ldrd r2, [%1], #8 \n\ + ldrd r4, [%1], #8 \n\ + mcr p15, 0, %0, c7, c6, 1 @ invalidate\n\ + strd r2, [%0], #8 \n\ + ldrd r2, [%1], #8 \n\ + strd r4, [%0], #8 \n\ + ldrd r4, [%1], #8 \n\ + strd r2, [%0], #8 \n\ + strd r4, [%0], #8 \n\ + ldrd r2, [%1], #8 \n\ + ldrd r4, [%1], #8 \n\ + mcr p15, 0, %0, c7, c6, 1 @ invalidate\n\ + strd r2, [%0], #8 \n\ + ldrd r2, [%1], #8 \n\ + subs %2, %2, #1 \n\ + strd r4, [%0], #8 \n\ + ldrd r4, [%1], #8 \n\ + strd r2, [%0], #8 \n\ + strd r4, [%0], #8 \n\ bgt 1b \n\ - beq 2b \n\ - \n\ - ldmfd sp!, {r4, r5, pc}" - : - : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE / 64 - 1)); + beq 2b " + : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp) + : "2" (PAGE_SIZE / 64 - 1) + : "r2", "r3", "r4", "r5"); } void xsc3_mc_copy_user_highpage(struct page *to, struct page *from, @@ -85,8 +78,6 @@ void xsc3_mc_copy_user_highpage(struct page *to, struct page *from, /* * XScale optimised clear_user_page - * r0 = destination - * r1 = virtual user address of ultimate destination page */ void xsc3_mc_clear_user_highpage(struct page *page, unsigned long vaddr) { diff --git a/arch/arm/mm/copypage-xscale.c b/arch/arm/mm/copypage-xscale.c index 0fb85025344d..c775d4b7adb0 100644 --- a/arch/arm/mm/copypage-xscale.c +++ b/arch/arm/mm/copypage-xscale.c @@ -36,52 +36,51 @@ static DEFINE_RAW_SPINLOCK(minicache_lock); * Dcache aliasing issue. The writes will be forwarded to the write buffer, * and merged as appropriate. */ -static void __naked -mc_copy_user_page(void *from, void *to) +static void mc_copy_user_page(void *from, void *to) { + int tmp; + /* * Strangely enough, best performance is achieved * when prefetching destination as well. (NP) */ - asm volatile( - "stmfd sp!, {r4, r5, lr} \n\ - mov lr, %2 \n\ - pld [r0, #0] \n\ - pld [r0, #32] \n\ - pld [r1, #0] \n\ - pld [r1, #32] \n\ -1: pld [r0, #64] \n\ - pld [r0, #96] \n\ - pld [r1, #64] \n\ - pld [r1, #96] \n\ -2: ldrd r2, [r0], #8 \n\ - ldrd r4, [r0], #8 \n\ - mov ip, r1 \n\ - strd r2, [r1], #8 \n\ - ldrd r2, [r0], #8 \n\ - strd r4, [r1], #8 \n\ - ldrd r4, [r0], #8 \n\ - strd r2, [r1], #8 \n\ - strd r4, [r1], #8 \n\ + asm volatile ("\ + pld [%0, #0] \n\ + pld [%0, #32] \n\ + pld [%1, #0] \n\ + pld [%1, #32] \n\ +1: pld [%0, #64] \n\ + pld [%0, #96] \n\ + pld [%1, #64] \n\ + pld [%1, #96] \n\ +2: ldrd r2, [%0], #8 \n\ + ldrd r4, [%0], #8 \n\ + mov ip, %1 \n\ + strd r2, [%1], #8 \n\ + ldrd r2, [%0], #8 \n\ + strd r4, [%1], #8 \n\ + ldrd r4, [%0], #8 \n\ + strd r2, [%1], #8 \n\ + strd r4, [%1], #8 \n\ mcr p15, 0, ip, c7, c10, 1 @ clean D line\n\ - ldrd r2, [r0], #8 \n\ + ldrd r2, [%0], #8 \n\ mcr p15, 0, ip, c7, c6, 1 @ invalidate D line\n\ - ldrd r4, [r0], #8 \n\ - mov ip, r1 \n\ - strd r2, [r1], #8 \n\ - ldrd r2, [r0], #8 \n\ - strd r4, [r1], #8 \n\ - ldrd r4, [r0], #8 \n\ - strd r2, [r1], #8 \n\ - strd r4, [r1], #8 \n\ + ldrd r4, [%0], #8 \n\ + mov ip, %1 \n\ + strd r2, [%1], #8 \n\ + ldrd r2, [%0], #8 \n\ + strd r4, [%1], #8 \n\ + ldrd r4, [%0], #8 \n\ + strd r2, [%1], #8 \n\ + strd r4, [%1], #8 \n\ mcr p15, 0, ip, c7, c10, 1 @ clean D line\n\ - subs lr, lr, #1 \n\ + subs %2, %2, #1 \n\ mcr p15, 0, ip, c7, c6, 1 @ invalidate D line\n\ bgt 1b \n\ - beq 2b \n\ - ldmfd sp!, {r4, r5, pc} " - : - : "r" (from), "r" (to), "I" (PAGE_SIZE / 64 - 1)); + beq 2b " + : "+&r" (from), "+&r" (to), "=&r" (tmp) + : "2" (PAGE_SIZE / 64 - 1) + : "r2", "r3", "r4", "r5", "ip"); } void xscale_mc_copy_user_highpage(struct page *to, struct page *from, From patchwork Mon Dec 20 12:25:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anders Roxell X-Patchwork-Id: 526815 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 91972C433F5 for ; Mon, 20 Dec 2021 12:25:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232699AbhLTMZk (ORCPT ); Mon, 20 Dec 2021 07:25:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57050 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231877AbhLTMZc (ORCPT ); Mon, 20 Dec 2021 07:25:32 -0500 Received: from mail-ed1-x533.google.com (mail-ed1-x533.google.com [IPv6:2a00:1450:4864:20::533]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 88B11C061748 for ; Mon, 20 Dec 2021 04:25:27 -0800 (PST) Received: by mail-ed1-x533.google.com with SMTP id j21so33136542edt.9 for ; Mon, 20 Dec 2021 04:25:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=9zZ2iIKjtnIzIajYT+GIxyKCjYpTcdEClasnE1DL9fE=; b=XJM0sxVa1/NGRk+2y/djXlnvrrZCKLzZKv/OEwdWfk9Zyf38nXFnHeK2/nABe8KddQ 4FRg1oJlYYxpW1hr+jo/viX/2b6tcL8vXnWSK1XbslCAEg25em6JgGBd2f3zez4RxFu/ VSK47QNaR/I6j5zkyGdNcOkXiuZUSjScdWPVfbqbxZdDrLtqOsWrv5x4XYiRiXUoW5mM 1xp/KuZ+Lt1Z2heUWiEluqBRK0YIhb5NyPWJlru8/vDhW3py1TonTRW+La+q+ztkJDjN GZAXgv+6znNMeG7yyGuAan6gTn46xzteUYvYx4Ojrxb27KceGZj6cihxSMm3s+Nc3URA aVLw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=9zZ2iIKjtnIzIajYT+GIxyKCjYpTcdEClasnE1DL9fE=; b=ZxtVBdUbDGoN+/C+TUUlJh7AKfsOF7vPLQVhdsrm0joheyenvgNeW50XfmOfokWTIg WT1/7MQ5+GltGWWWTcs6oxCk3CtCdXoK6DB77jquxsQgajw97mb4tKmQ7K1wU1mugz3W pwbWB3JaOnIdR1OwI5y7pCfXQaQY6Jjf0KQG9k2VDi2sQRIvaQ7Emy6Q3r41wDuQIg/D eY9PuuBXY7PYRlPAnwy4acdXc5Fd55CGFeM/uTNHCe7QhiGwi+csy8WKg1n1X1VHAS6H +WucgK0p8MFMYpwxL4wOvun3uDTmobHdhl8pjUBMSBKryBxpMQpGMdKXIWv4wuopHvl9 flnQ== X-Gm-Message-State: AOAM5317AwxObTDK7wtU3ftSq/15Lkn8imT5oxGOfS45k6TOjAd35VLO i4rgRLd/xqs/jsdkHrbaLtS/PA== X-Google-Smtp-Source: ABdhPJy1EpKyVaxwroCMhEoEILe7wDpRAzPVoYD0LdsyOvkVF7DZXv9DRuVZ3s6VPQm2ijVhVBlHhw== X-Received: by 2002:a17:906:dfea:: with SMTP id lc10mr4522007ejc.459.1640003126034; Mon, 20 Dec 2021 04:25:26 -0800 (PST) Received: from localhost (c-9b28e555.07-21-73746f28.bbcust.telenor.se. [85.229.40.155]) by smtp.gmail.com with ESMTPSA id e26sm6759811edr.82.2021.12.20.04.25.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Dec 2021 04:25:25 -0800 (PST) From: Anders Roxell To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, woojung.huh@microchip.com, UNGLinuxDriver@microchip.com, davem@davemloft.net, netdev@vger.kernel.org, linux-usb@vger.kernel.org, clang-built-linux@googlegroups.com, ulli.kroll@googlemail.com, linux@armlinux.org.uk, linux-arm-kernel@lists.infradead.org, amitkarwar@gmail.com, nishants@marvell.com, gbhat@marvell.com, huxinming820@gmail.com, kvalo@codeaurora.org, linux-wireless@vger.kernel.org, rostedt@goodmis.org, mingo@redhat.com, dmitry.torokhov@gmail.com, ndesaulniers@google.com, nathan@kernel.org, linux-input@vger.kernel.org, Nathan Chancellor , Andy Lavr , Anders Roxell Subject: [PATCH 4.14 3/6] mwifiex: Remove unnecessary braces from HostCmd_SET_SEQ_NO_BSS_INFO Date: Mon, 20 Dec 2021 13:25:03 +0100 Message-Id: <20211220122506.3631672-4-anders.roxell@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211220122506.3631672-1-anders.roxell@linaro.org> References: <20211220122506.3631672-1-anders.roxell@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Nathan Chancellor commit 6a953dc4dbd1c7057fb765a24f37a5e953c85fb0 upstream. A new warning in clang points out when macro expansion might result in a GNU C statement expression. There is an instance of this in the mwifiex driver: drivers/net/wireless/marvell/mwifiex/cmdevt.c:217:34: warning: '}' and ')' tokens terminating statement expression appear in different macro expansion contexts [-Wcompound-token-split-by-macro] host_cmd->seq_num = cpu_to_le16(HostCmd_SET_SEQ_NO_BSS_INFO ^~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/wireless/marvell/mwifiex/fw.h:519:46: note: expanded from macro 'HostCmd_SET_SEQ_NO_BSS_INFO' (((type) & 0x000f) << 12); } ^ This does not appear to be a real issue. Removing the braces and replacing them with parentheses will fix the warning and not change the meaning of the code. Fixes: 5e6e3a92b9a4 ("wireless: mwifiex: initial commit for Marvell mwifiex driver") Link: https://github.com/ClangBuiltLinux/linux/issues/1146 Reported-by: Andy Lavr Signed-off-by: Nathan Chancellor Reviewed-by: Nick Desaulniers Signed-off-by: Kalle Valo Signed-off-by: Anders Roxell --- drivers/net/wireless/marvell/mwifiex/cmdevt.c | 4 ++-- drivers/net/wireless/marvell/mwifiex/fw.h | 8 ++++---- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/net/wireless/marvell/mwifiex/cmdevt.c b/drivers/net/wireless/marvell/mwifiex/cmdevt.c index 0edc5d621304..a9cee3dac97b 100644 --- a/drivers/net/wireless/marvell/mwifiex/cmdevt.c +++ b/drivers/net/wireless/marvell/mwifiex/cmdevt.c @@ -323,9 +323,9 @@ static int mwifiex_dnld_sleep_confirm_cmd(struct mwifiex_adapter *adapter) adapter->seq_num++; sleep_cfm_buf->seq_num = - cpu_to_le16((HostCmd_SET_SEQ_NO_BSS_INFO + cpu_to_le16(HostCmd_SET_SEQ_NO_BSS_INFO (adapter->seq_num, priv->bss_num, - priv->bss_type))); + priv->bss_type)); mwifiex_dbg(adapter, CMD, "cmd: DNLD_CMD: %#x, act %#x, len %d, seqno %#x\n", diff --git a/drivers/net/wireless/marvell/mwifiex/fw.h b/drivers/net/wireless/marvell/mwifiex/fw.h index 1d86d29b64cc..c802b73a15c5 100644 --- a/drivers/net/wireless/marvell/mwifiex/fw.h +++ b/drivers/net/wireless/marvell/mwifiex/fw.h @@ -498,10 +498,10 @@ enum mwifiex_channel_flags { #define RF_ANTENNA_AUTO 0xFFFF -#define HostCmd_SET_SEQ_NO_BSS_INFO(seq, num, type) { \ - (((seq) & 0x00ff) | \ - (((num) & 0x000f) << 8)) | \ - (((type) & 0x000f) << 12); } +#define HostCmd_SET_SEQ_NO_BSS_INFO(seq, num, type) \ + ((((seq) & 0x00ff) | \ + (((num) & 0x000f) << 8)) | \ + (((type) & 0x000f) << 12)) #define HostCmd_GET_SEQ_NO(seq) \ ((seq) & HostCmd_SEQ_NUM_MASK) From patchwork Mon Dec 20 12:25:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anders Roxell X-Patchwork-Id: 526305 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 00AF7C4321E for ; Mon, 20 Dec 2021 12:25:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232762AbhLTMZq (ORCPT ); Mon, 20 Dec 2021 07:25:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57042 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232588AbhLTMZh (ORCPT ); Mon, 20 Dec 2021 07:25:37 -0500 Received: from mail-ed1-x52a.google.com (mail-ed1-x52a.google.com [IPv6:2a00:1450:4864:20::52a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AEC2FC061761 for ; Mon, 20 Dec 2021 04:25:28 -0800 (PST) Received: by mail-ed1-x52a.google.com with SMTP id bm14so24702176edb.5 for ; Mon, 20 Dec 2021 04:25:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Hl+ryow41wi2SaGEsd9ekcLiVIZ1XeLL/2x+u6A5DI4=; b=ySXDbKpAQDvqd1KrQTCpKrrUdahL3ZhLdFVTEKN/Q2EKUyM05WYjpqrSUoJGpxmpjV 6IwEyq4mqK7OUfprSz7xlHYLVDBOanZrlb7dP0BqgCk1+mGUzrcChGv+KXCwGkV+5dm6 y3Rn78yADkPHO4MgtvQASZx53Ae6lGFDrEj+397ljnhlhvhsqeWZLv6/0xJ9aryUGN/q RF/UR+BRbaCfazfb/NRQU8sJn2kzA5v6k1IAax8NCP6tIHxvkUHU1E1Sic8OKBBhf19H nJu0cHsL9WM9sw6PCLhkR4i4cERgq1x4csGvShaKXZk+anad3qJcz/tz28LwHujjC08z S6FQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Hl+ryow41wi2SaGEsd9ekcLiVIZ1XeLL/2x+u6A5DI4=; b=r85IXhK0rDwU47iXRhsAdx1j9x8BMYbwBnoTYYkZRAdxkl6/M8QJ2aTRqSTOdME6lS w9QCQn4LlvU8NcOSBCL0rN8tcbSvfoiVSH1f6a283Da1vHIjlA3ygbnKnXEfF9cNcRco ai2t2JYPAujEzfIYEgf1VqYyTbu4jVOc4gbZubupBj2zPSf7vKtYQtUMwvB3AxKKRLu9 +Xc3nm81M9EhD2CdWu44SUsE20OEUmQQGctfim40A6rE0uHk5T2FvGleaXgi+/vHtsIg O3SNog+cybdmicNlsyESGmY2ewAiv1R0sU86THc4J8uh1N9ad+gAbq2pxYnQcuDEbKDq gaMQ== X-Gm-Message-State: AOAM531AGLsgyAy9EeQTaJsAKW6GM3k9RZTRT77wdGDvPfja2+olOMjy SgKP50zLyetxQZssJgIJSZXn8w== X-Google-Smtp-Source: ABdhPJz8Er9dgu/RM1Q8UYWfCgZhMuHYfuPV3UUY5O/KX+SXO9evYAOe/OrFlAxOKtfwPpm4d1c4Zg== X-Received: by 2002:a17:906:6996:: with SMTP id i22mr13335152ejr.293.1640003127203; Mon, 20 Dec 2021 04:25:27 -0800 (PST) Received: from localhost (c-9b28e555.07-21-73746f28.bbcust.telenor.se. [85.229.40.155]) by smtp.gmail.com with ESMTPSA id y5sm3044716edm.39.2021.12.20.04.25.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Dec 2021 04:25:26 -0800 (PST) From: Anders Roxell To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, woojung.huh@microchip.com, UNGLinuxDriver@microchip.com, davem@davemloft.net, netdev@vger.kernel.org, linux-usb@vger.kernel.org, clang-built-linux@googlegroups.com, ulli.kroll@googlemail.com, linux@armlinux.org.uk, linux-arm-kernel@lists.infradead.org, amitkarwar@gmail.com, nishants@marvell.com, gbhat@marvell.com, huxinming820@gmail.com, kvalo@codeaurora.org, linux-wireless@vger.kernel.org, rostedt@goodmis.org, mingo@redhat.com, dmitry.torokhov@gmail.com, ndesaulniers@google.com, nathan@kernel.org, linux-input@vger.kernel.org, Stefan Agner , Arnd Bergmann , Russell King , Anders Roxell Subject: [PATCH 4.14 4/6] ARM: 8800/1: use choice for kernel unwinders Date: Mon, 20 Dec 2021 13:25:04 +0100 Message-Id: <20211220122506.3631672-5-anders.roxell@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211220122506.3631672-1-anders.roxell@linaro.org> References: <20211220122506.3631672-1-anders.roxell@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Stefan Agner commit f9b58e8c7d031b0daa5c9a9ee27f5a4028ba53ac upstream. While in theory multiple unwinders could be compiled in, it does not make sense in practise. Use a choice to make the unwinder selection mutually exclusive and mandatory. Already before this commit it has not been possible to deselect FRAME_POINTER. Remove the obsolete comment. Furthermore, to produce a meaningful backtrace with FRAME_POINTER enabled the kernel needs a specific function prologue: mov ip, sp stmfd sp!, {fp, ip, lr, pc} sub fp, ip, #4 To get to the required prologue gcc uses apcs and no-sched-prolog. This compiler options are not available on clang, and clang is not able to generate the required prologue. Make the FRAME_POINTER config symbol depending on !clang. Suggested-by: Arnd Bergmann Signed-off-by: Stefan Agner Reviewed-by: Arnd Bergmann Signed-off-by: Russell King Signed-off-by: Anders Roxell --- arch/arm/Kconfig.debug | 44 +++++++++++++++++++++++++++--------------- lib/Kconfig.debug | 6 +++--- 2 files changed, 31 insertions(+), 19 deletions(-) diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index b14f154919a5..d6cf18a0cb0a 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -16,30 +16,42 @@ config ARM_PTDUMP kernel. If in doubt, say "N" -# RMK wants arm kernels compiled with frame pointers or stack unwinding. -# If you know what you are doing and are willing to live without stack -# traces, you can get a slightly smaller kernel by setting this option to -# n, but then RMK will have to kill you ;). -config FRAME_POINTER - bool - depends on !THUMB2_KERNEL - default y if !ARM_UNWIND || FUNCTION_GRAPH_TRACER +choice + prompt "Choose kernel unwinder" + default UNWINDER_ARM if AEABI && !FUNCTION_GRAPH_TRACER + default UNWINDER_FRAME_POINTER if !AEABI || FUNCTION_GRAPH_TRACER + help + This determines which method will be used for unwinding kernel stack + traces for panics, oopses, bugs, warnings, perf, /proc//stack, + livepatch, lockdep, and more. + +config UNWINDER_FRAME_POINTER + bool "Frame pointer unwinder" + depends on !THUMB2_KERNEL && !CC_IS_CLANG + select ARCH_WANT_FRAME_POINTERS + select FRAME_POINTER help - If you say N here, the resulting kernel will be slightly smaller and - faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled, - when a problem occurs with the kernel, the information that is - reported is severely limited. + This option enables the frame pointer unwinder for unwinding + kernel stack traces. -config ARM_UNWIND - bool "Enable stack unwinding support (EXPERIMENTAL)" +config UNWINDER_ARM + bool "ARM EABI stack unwinder" depends on AEABI - default y + select ARM_UNWIND help This option enables stack unwinding support in the kernel using the information automatically generated by the compiler. The resulting kernel image is slightly bigger but the performance is not affected. Currently, this feature - only works with EABI compilers. If unsure say Y. + only works with EABI compilers. + +endchoice + +config ARM_UNWIND + bool + +config FRAME_POINTER + bool config OLD_MCOUNT bool diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 428eaf16a1d2..f63a4faf244e 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1131,7 +1131,7 @@ config LOCKDEP bool depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT select STACKTRACE - select FRAME_POINTER if !MIPS && !PPC && !ARM_UNWIND && !S390 && !MICROBLAZE && !ARC && !SCORE && !X86 + select FRAME_POINTER if !MIPS && !PPC && !ARM && !S390 && !MICROBLAZE && !ARC && !SCORE && !X86 select KALLSYMS select KALLSYMS_ALL @@ -1566,7 +1566,7 @@ config FAULT_INJECTION_STACKTRACE_FILTER depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT depends on !X86_64 select STACKTRACE - select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND && !ARC && !SCORE && !X86 + select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !SCORE && !X86 help Provide stacktrace filter for fault-injection capabilities @@ -1575,7 +1575,7 @@ config LATENCYTOP depends on DEBUG_KERNEL depends on STACKTRACE_SUPPORT depends on PROC_FS - select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND && !ARC && !X86 + select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86 select KALLSYMS select KALLSYMS_ALL select STACKTRACE From patchwork Mon Dec 20 12:25:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anders Roxell X-Patchwork-Id: 526814 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D3939C433EF for ; Mon, 20 Dec 2021 12:25:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232784AbhLTMZr (ORCPT ); Mon, 20 Dec 2021 07:25:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57096 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232680AbhLTMZk (ORCPT ); Mon, 20 Dec 2021 07:25:40 -0500 Received: from mail-ed1-x532.google.com (mail-ed1-x532.google.com [IPv6:2a00:1450:4864:20::532]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E284FC06179C for ; Mon, 20 Dec 2021 04:25:30 -0800 (PST) Received: by mail-ed1-x532.google.com with SMTP id z29so37461545edl.7 for ; Mon, 20 Dec 2021 04:25:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=y9p66fbbXmmdoe66+VpQbolcPKBKj6fnJ63vNfrT6S4=; b=YVJMyKZ8Oh1GNZ0whPOV2vitwbTlWCKRfomQnVzp9B+YoAZua8W04gMYE09bNG6LEm e7kAQhEV5HpvxSDqjuyh/VKUQqP31868vOOMlNs9o7c2DmwRSdLc3+VOa0eeEOzCOr2x PIaCIYNiivckTCUF/I1kkJjFbgpSIOnUhlnGq/q8l5RunT7MVt46D498BFnPUlkNrwyh 9SrxWTI1I8Txk3RcIfncWVvVOmxcJRq34DXZMB1o/4172wNdKiVBGDlnILoqJ1+/nqN9 vSPV292l+w74a73wFbHFQ2u4WKV0qi2yQ/5Hr+f5+SDlkE3UWi+Hg/qmXQoUJsuP/oB1 2zKw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=y9p66fbbXmmdoe66+VpQbolcPKBKj6fnJ63vNfrT6S4=; b=h/VnzImVXx1xYYnan2m73QfO1x4LJyzDWaVnTbx2UTsv5FVefj7/1KptlcRj02C8Pt Bcq1jYB0TckUbHD/n1yZRQw6gWFvnwLqcIEJskUZrseGzzE2NYDAGpFbfzdA3X0fyWga JyyCSSSdu5KlV7Qy4i4v7lOsmEzm8ubE/pEJLCb2yyVLGXXcGHtPbv993ydGJcjA7n2/ LiPOHVlHokKHSkmg1gM0LtTdAvvQ8Xd/NcXMTh2ZinPuKwXhVhQFzNpEy48zIq6cnxOI lQoF3fZ27loS30fnhx221Vqjs9+B4upy4RsiRIV2nH1IHL2TukbXx0MUrkhtUmCfhJUQ Meug== X-Gm-Message-State: AOAM53343/ethOX7w6p7mLK9eiRLA0MWJrG83evkRTedPDvHgs+FYvhz xyFqB4mb4UDQ/219/aatfhWSig== X-Google-Smtp-Source: ABdhPJxhEedLLpq/rgZ6+N+c5hVymQYTWBOyXdRvdoYBZkGsI8iGxhDm1QSjP+MFXYLW7oZDvD211w== X-Received: by 2002:aa7:d818:: with SMTP id v24mr5403691edq.298.1640003129502; Mon, 20 Dec 2021 04:25:29 -0800 (PST) Received: from localhost (c-9b28e555.07-21-73746f28.bbcust.telenor.se. [85.229.40.155]) by smtp.gmail.com with ESMTPSA id sd23sm1027245ejc.155.2021.12.20.04.25.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Dec 2021 04:25:29 -0800 (PST) From: Anders Roxell To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, woojung.huh@microchip.com, UNGLinuxDriver@microchip.com, davem@davemloft.net, netdev@vger.kernel.org, linux-usb@vger.kernel.org, clang-built-linux@googlegroups.com, ulli.kroll@googlemail.com, linux@armlinux.org.uk, linux-arm-kernel@lists.infradead.org, amitkarwar@gmail.com, nishants@marvell.com, gbhat@marvell.com, huxinming820@gmail.com, kvalo@codeaurora.org, linux-wireless@vger.kernel.org, rostedt@goodmis.org, mingo@redhat.com, dmitry.torokhov@gmail.com, ndesaulniers@google.com, nathan@kernel.org, linux-input@vger.kernel.org, Stefan Agner , Russell King , Anders Roxell Subject: [PATCH 4.14 5/6] ARM: 8788/1: ftrace: remove old mcount support Date: Mon, 20 Dec 2021 13:25:05 +0100 Message-Id: <20211220122506.3631672-6-anders.roxell@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211220122506.3631672-1-anders.roxell@linaro.org> References: <20211220122506.3631672-1-anders.roxell@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Stefan Agner commit d3c61619568c88d48eccd5e74b4f84faa1440652 upstream. Commit cafa0010cd51 ("Raise the minimum required gcc version to 4.6") raised the minimum GCC version to 4.6. Old mcount is only required for GCC versions older than 4.4.0. Hence old mcount support can be dropped too. Signed-off-by: Stefan Agner Signed-off-by: Russell King Signed-off-by: Anders Roxell --- arch/arm/Kconfig.debug | 5 --- arch/arm/include/asm/ftrace.h | 3 -- arch/arm/kernel/armksyms.c | 3 -- arch/arm/kernel/entry-ftrace.S | 75 ++-------------------------------- arch/arm/kernel/ftrace.c | 51 ----------------------- 5 files changed, 4 insertions(+), 133 deletions(-) diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index d6cf18a0cb0a..55ce348b693e 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -53,11 +53,6 @@ config ARM_UNWIND config FRAME_POINTER bool -config OLD_MCOUNT - bool - depends on FUNCTION_TRACER && FRAME_POINTER - default y - config DEBUG_USER bool "Verbose user fault messages" help diff --git a/arch/arm/include/asm/ftrace.h b/arch/arm/include/asm/ftrace.h index faeb6b1c0089..15bd9af13497 100644 --- a/arch/arm/include/asm/ftrace.h +++ b/arch/arm/include/asm/ftrace.h @@ -16,9 +16,6 @@ extern void __gnu_mcount_nc(void); #ifdef CONFIG_DYNAMIC_FTRACE struct dyn_arch_ftrace { -#ifdef CONFIG_OLD_MCOUNT - bool old_mcount; -#endif #ifdef CONFIG_ARM_MODULE_PLTS struct module *mod; #endif diff --git a/arch/arm/kernel/armksyms.c b/arch/arm/kernel/armksyms.c index 5266fd9ad6b4..62c62c651766 100644 --- a/arch/arm/kernel/armksyms.c +++ b/arch/arm/kernel/armksyms.c @@ -168,9 +168,6 @@ EXPORT_SYMBOL(_find_next_bit_be); #endif #ifdef CONFIG_FUNCTION_TRACER -#ifdef CONFIG_OLD_MCOUNT -EXPORT_SYMBOL(mcount); -#endif EXPORT_SYMBOL(__gnu_mcount_nc); #endif diff --git a/arch/arm/kernel/entry-ftrace.S b/arch/arm/kernel/entry-ftrace.S index efcd9f25a14b..0be69e551a64 100644 --- a/arch/arm/kernel/entry-ftrace.S +++ b/arch/arm/kernel/entry-ftrace.S @@ -15,23 +15,8 @@ * start of every function. In mcount, apart from the function's address (in * lr), we need to get hold of the function's caller's address. * - * Older GCCs (pre-4.4) inserted a call to a routine called mcount like this: - * - * bl mcount - * - * These versions have the limitation that in order for the mcount routine to - * be able to determine the function's caller's address, an APCS-style frame - * pointer (which is set up with something like the code below) is required. - * - * mov ip, sp - * push {fp, ip, lr, pc} - * sub fp, ip, #4 - * - * With EABI, these frame pointers are not available unless -mapcs-frame is - * specified, and if building as Thumb-2, not even then. - * - * Newer GCCs (4.4+) solve this problem by introducing a new version of mcount, - * with call sites like: + * Newer GCCs (4.4+) solve this problem by using a version of mcount with call + * sites like: * * push {lr} * bl __gnu_mcount_nc @@ -46,17 +31,10 @@ * allows it to be clobbered in subroutines and doesn't use it to hold * parameters.) * - * When using dynamic ftrace, we patch out the mcount call by a "mov r0, r0" - * for the mcount case, and a "pop {lr}" for the __gnu_mcount_nc case (see - * arch/arm/kernel/ftrace.c). + * When using dynamic ftrace, we patch out the mcount call by a "pop {lr}" + * instead of the __gnu_mcount_nc call (see arch/arm/kernel/ftrace.c). */ -#ifndef CONFIG_OLD_MCOUNT -#if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 4)) -#error Ftrace requires CONFIG_FRAME_POINTER=y with GCC older than 4.4.0. -#endif -#endif - .macro mcount_adjust_addr rd, rn bic \rd, \rn, #1 @ clear the Thumb bit if present sub \rd, \rd, #MCOUNT_INSN_SIZE @@ -209,51 +187,6 @@ ftrace_graph_call\suffix: mcount_exit .endm -#ifdef CONFIG_OLD_MCOUNT -/* - * mcount - */ - -.macro mcount_enter - stmdb sp!, {r0-r3, lr} -.endm - -.macro mcount_get_lr reg - ldr \reg, [fp, #-4] -.endm - -.macro mcount_exit - ldr lr, [fp, #-4] - ldmia sp!, {r0-r3, pc} -.endm - -ENTRY(mcount) -#ifdef CONFIG_DYNAMIC_FTRACE - stmdb sp!, {lr} - ldr lr, [fp, #-4] - ldmia sp!, {pc} -#else - __mcount _old -#endif -ENDPROC(mcount) - -#ifdef CONFIG_DYNAMIC_FTRACE -ENTRY(ftrace_caller_old) - __ftrace_caller _old -ENDPROC(ftrace_caller_old) -#endif - -#ifdef CONFIG_FUNCTION_GRAPH_TRACER -ENTRY(ftrace_graph_caller_old) - __ftrace_graph_caller -ENDPROC(ftrace_graph_caller_old) -#endif - -.purgem mcount_enter -.purgem mcount_get_lr -.purgem mcount_exit -#endif - /* * __gnu_mcount_nc */ diff --git a/arch/arm/kernel/ftrace.c b/arch/arm/kernel/ftrace.c index 1a5edcfb0306..2fb63ece5c85 100644 --- a/arch/arm/kernel/ftrace.c +++ b/arch/arm/kernel/ftrace.c @@ -47,30 +47,6 @@ void arch_ftrace_update_code(int command) stop_machine(__ftrace_modify_code, &command, NULL); } -#ifdef CONFIG_OLD_MCOUNT -#define OLD_MCOUNT_ADDR ((unsigned long) mcount) -#define OLD_FTRACE_ADDR ((unsigned long) ftrace_caller_old) - -#define OLD_NOP 0xe1a00000 /* mov r0, r0 */ - -static unsigned long ftrace_nop_replace(struct dyn_ftrace *rec) -{ - return rec->arch.old_mcount ? OLD_NOP : NOP; -} - -static unsigned long adjust_address(struct dyn_ftrace *rec, unsigned long addr) -{ - if (!rec->arch.old_mcount) - return addr; - - if (addr == MCOUNT_ADDR) - addr = OLD_MCOUNT_ADDR; - else if (addr == FTRACE_ADDR) - addr = OLD_FTRACE_ADDR; - - return addr; -} -#else static unsigned long ftrace_nop_replace(struct dyn_ftrace *rec) { return NOP; @@ -80,7 +56,6 @@ static unsigned long adjust_address(struct dyn_ftrace *rec, unsigned long addr) { return addr; } -#endif int ftrace_arch_code_modify_prepare(void) { @@ -151,15 +126,6 @@ int ftrace_update_ftrace_func(ftrace_func_t func) } #endif -#ifdef CONFIG_OLD_MCOUNT - if (!ret) { - pc = (unsigned long)&ftrace_call_old; - new = ftrace_call_replace(pc, (unsigned long)func, true); - - ret = ftrace_modify_code(pc, 0, new, false); - } -#endif - return ret; } @@ -233,16 +199,6 @@ int ftrace_make_nop(struct module *mod, new = ftrace_nop_replace(rec); ret = ftrace_modify_code(ip, old, new, true); -#ifdef CONFIG_OLD_MCOUNT - if (ret == -EINVAL && addr == MCOUNT_ADDR) { - rec->arch.old_mcount = true; - - old = ftrace_call_replace(ip, adjust_address(rec, addr), true); - new = ftrace_nop_replace(rec); - ret = ftrace_modify_code(ip, old, new, true); - } -#endif - return ret; } @@ -320,13 +276,6 @@ static int ftrace_modify_graph_caller(bool enable) #endif -#ifdef CONFIG_OLD_MCOUNT - if (!ret) - ret = __ftrace_modify_caller(&ftrace_graph_call_old, - ftrace_graph_caller_old, - enable); -#endif - return ret; } From patchwork Mon Dec 20 12:25:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anders Roxell X-Patchwork-Id: 526304 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 57FF4C4332F for ; Mon, 20 Dec 2021 12:25:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232240AbhLTMZz (ORCPT ); Mon, 20 Dec 2021 07:25:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57062 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232712AbhLTMZk (ORCPT ); Mon, 20 Dec 2021 07:25:40 -0500 Received: from mail-ed1-x52a.google.com (mail-ed1-x52a.google.com [IPv6:2a00:1450:4864:20::52a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CD5FFC061397 for ; Mon, 20 Dec 2021 04:25:31 -0800 (PST) Received: by mail-ed1-x52a.google.com with SMTP id w16so9102669edc.11 for ; Mon, 20 Dec 2021 04:25:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=w5l6X42Q1hhXCCV2zsPbnIHkIz6QpyD+5/B2sPrSWbY=; b=uHtnQauXfEDehUTW3/mo9D+1L4N9XvyEnrV3PWHgIVKLDI0+YN6JE59jYmRUu8ttAt snnxXD/D/LfL4gCCzkyGoT80nqJCm1pv9GEQCuWz73zs71md02zDrXnEZafgTrP8lHiN UFGQAGnwigOuPBvE182PuL34GxLCmKBT7N+5VSyIWaJBN7u1pFH5voc5Kypo2PSwKpo1 VLuyc3Q5ZSJcUql9Jfue73VA6vpf94pys2R1tl8svSpsz0XNuncp4eL3NSbhaN+sNimc mRmAWdH6kcbsjeE/VO1HfmRMvdycysQ2XRzDqxjp2fKCrBMfp9NjlEd2abN0RWaMITmZ P5+w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=w5l6X42Q1hhXCCV2zsPbnIHkIz6QpyD+5/B2sPrSWbY=; b=hw5Vgq0xqGLKogobTumi0EM1AhgExXP0XEDABMdxcMCn30Q9h1Iu2jVgqrEzMI+CpP kMflh50IBaUDCcUuxVIXruI5hR2AcgeHWCHtfEIzRNLqZiHXPiuLD2ft3kiplJURChDz YbjDn38MX1NOtrOXFu285hIXGWquTqoe3hVVe/ESykTHQLCn1qGayOIivEeeKG/jFWAN aHm3uKLX+dQRIsqJSLojHhyShpmVwg9+KLilxyEGCDS71LAlI8HUgse7weLCGXGlFuBr sddx/aueMfOw1yGUEvDVEUViKa5w1uVi8VvdmiEzdVLFwWtxk1ljrmlhWLlzL35zN9/d G1kg== X-Gm-Message-State: AOAM531sFwCYfeVhjjSWXi/47P6d8q7TJs5PjOKGR4Cz6o1ycsv1SDiO 4aoJhMV5pdJU8hXd8Shp6ol9Zg== X-Google-Smtp-Source: ABdhPJy7gIVM+o8shhal/Gr1KRTZnigRs3pcnv4cEkYdnY7HfAegHCfmBO0COi70irMOHyzh7/q03A== X-Received: by 2002:a17:907:16a8:: with SMTP id hc40mr10497296ejc.210.1640003130404; Mon, 20 Dec 2021 04:25:30 -0800 (PST) Received: from localhost (c-9b28e555.07-21-73746f28.bbcust.telenor.se. [85.229.40.155]) by smtp.gmail.com with ESMTPSA id f27sm4335374ejc.137.2021.12.20.04.25.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Dec 2021 04:25:30 -0800 (PST) From: Anders Roxell To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, woojung.huh@microchip.com, UNGLinuxDriver@microchip.com, davem@davemloft.net, netdev@vger.kernel.org, linux-usb@vger.kernel.org, clang-built-linux@googlegroups.com, ulli.kroll@googlemail.com, linux@armlinux.org.uk, linux-arm-kernel@lists.infradead.org, amitkarwar@gmail.com, nishants@marvell.com, gbhat@marvell.com, huxinming820@gmail.com, kvalo@codeaurora.org, linux-wireless@vger.kernel.org, rostedt@goodmis.org, mingo@redhat.com, dmitry.torokhov@gmail.com, ndesaulniers@google.com, nathan@kernel.org, linux-input@vger.kernel.org, Anders Roxell Subject: [PATCH 4.14 6/6] Input: touchscreen - avoid bitwise vs logical OR warning Date: Mon, 20 Dec 2021 13:25:06 +0100 Message-Id: <20211220122506.3631672-7-anders.roxell@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211220122506.3631672-1-anders.roxell@linaro.org> References: <20211220122506.3631672-1-anders.roxell@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Nathan Chancellor commit a02dcde595f7cbd240ccd64de96034ad91cffc40 upstream. A new warning in clang points out a few places in this driver where a bitwise OR is being used with boolean types: drivers/input/touchscreen.c:81:17: warning: use of bitwise '|' with boolean operands [-Wbitwise-instead-of-logical] data_present = touchscreen_get_prop_u32(dev, "touchscreen-min-x", ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This use of a bitwise OR is intentional, as bitwise operations do not short circuit, which allows all the calls to touchscreen_get_prop_u32() to happen so that the last parameter is initialized while coalescing the results of the calls to make a decision after they are all evaluated. To make this clearer to the compiler, use the '|=' operator to assign the result of each touchscreen_get_prop_u32() call to data_present, which keeps the meaning of the code the same but makes it obvious that every one of these calls is expected to happen. Signed-off-by: Nathan Chancellor Reported-by: Nick Desaulniers Reviewed-by: Nick Desaulniers Link: https://lore.kernel.org/r/20211014205757.3474635-1-nathan@kernel.org Signed-off-by: Dmitry Torokhov Signed-off-by: Anders Roxell --- drivers/input/touchscreen/of_touchscreen.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/drivers/input/touchscreen/of_touchscreen.c b/drivers/input/touchscreen/of_touchscreen.c index 8d7f9c8f2771..db499ef6ccff 100644 --- a/drivers/input/touchscreen/of_touchscreen.c +++ b/drivers/input/touchscreen/of_touchscreen.c @@ -79,8 +79,8 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch, data_present = touchscreen_get_prop_u32(dev, "touchscreen-size-x", input_abs_get_max(input, axis) + 1, - &maximum) | - touchscreen_get_prop_u32(dev, "touchscreen-fuzz-x", + &maximum); + data_present |= touchscreen_get_prop_u32(dev, "touchscreen-fuzz-x", input_abs_get_fuzz(input, axis), &fuzz); if (data_present) @@ -90,8 +90,8 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch, data_present = touchscreen_get_prop_u32(dev, "touchscreen-size-y", input_abs_get_max(input, axis) + 1, - &maximum) | - touchscreen_get_prop_u32(dev, "touchscreen-fuzz-y", + &maximum); + data_present |= touchscreen_get_prop_u32(dev, "touchscreen-fuzz-y", input_abs_get_fuzz(input, axis), &fuzz); if (data_present) @@ -101,11 +101,11 @@ void touchscreen_parse_properties(struct input_dev *input, bool multitouch, data_present = touchscreen_get_prop_u32(dev, "touchscreen-max-pressure", input_abs_get_max(input, axis), - &maximum) | - touchscreen_get_prop_u32(dev, - "touchscreen-fuzz-pressure", - input_abs_get_fuzz(input, axis), - &fuzz); + &maximum); + data_present |= touchscreen_get_prop_u32(dev, + "touchscreen-fuzz-pressure", + input_abs_get_fuzz(input, axis), + &fuzz); if (data_present) touchscreen_set_params(input, axis, maximum, fuzz);