From patchwork Tue May 16 19:35:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 683177 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 AA65DC77B7A for ; Tue, 16 May 2023 19:38:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230211AbjEPTiW (ORCPT ); Tue, 16 May 2023 15:38:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56914 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230214AbjEPTiI (ORCPT ); Tue, 16 May 2023 15:38:08 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 592EDA24F; Tue, 16 May 2023 12:37:48 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 71AA863EA8; Tue, 16 May 2023 19:37:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 31EEEC433D2; Tue, 16 May 2023 19:37:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1684265840; bh=HzuyPJn9FfyStpC9b/gY3UOkJ1RIpy94E010iL3VMAA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lyMTmn90wbr/qFgLkHQFxSX2cjoGcxvnL1nVSavn0cO0jwQAdZ0abIUvOOmHaJE4h SRKGKH4YuALaqYyeDXwC2rmXjbD8x3uOm+2hb9k6zSm0RE9k2ye4pRA7pKDh/KFcUg 74ThzTAjh7UyyblnQImUp9i/blUb9mBsmos5h+x7AgL6jhJm2i+7HlTCuZjmpcKHzQ a92UzT+0fGfuHuE9dTXbB60MlSLud/EeFS1nvtAW1I2R9HUD4pSyK9Lo7mDNBfABSe uLCctFq8BxZkKc2zL5wl5wy4XGrTMum5M9PugMRDnqjPC1nckk1AZSNKzdl5PpJ2N5 Yjoqi6uLxWodA== From: Arnd Bergmann To: x86@kernel.org Cc: Arnd Bergmann , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Andy Lutomirski , Steven Rostedt , Masami Hiramatsu , Mark Rutland , Juergen Gross , "Srivatsa S. Bhat (VMware)" , Alexey Makhalov , VMware PV-Drivers Reviewers , Peter Zijlstra , Darren Hart , Andy Shevchenko , Boris Ostrovsky , "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-pci@vger.kernel.org, platform-driver-x86@vger.kernel.org, xen-devel@lists.xenproject.org, linux-pm@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 12/20] x86: qspinlock-paravirt: fix mising-prototype warnings Date: Tue, 16 May 2023 21:35:41 +0200 Message-Id: <20230516193549.544673-13-arnd@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230516193549.544673-1-arnd@kernel.org> References: <20230516193549.544673-1-arnd@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Arnd Bergmann __pv_queued_spin_unlock_slowpath is defined in a header file as a global function, and designed to be called from an inline asm, but there is no prototype visible in the definition: kernel/locking/qspinlock_paravirt.h:493:1: error: no previous prototype for '__pv_queued_spin_unlock_slowpath' [-Werror=missing-prototypes] Add this to the x86 header that contains the inline asm calling it, and ensure this gets included before the definition, rather than after it. The native_pv_lock_init function in turn is only declared in SMP builds but can be left out in UP to avoid another warning: arch/x86/kernel/paravirt.c:76:13: error: no previous prototype for 'native_pv_lock_init' [-Werror=missing-prototypes] Signed-off-by: Arnd Bergmann --- arch/x86/include/asm/qspinlock_paravirt.h | 2 ++ arch/x86/kernel/paravirt.c | 2 ++ kernel/locking/qspinlock_paravirt.h | 20 ++++++++++---------- 3 files changed, 14 insertions(+), 10 deletions(-) diff --git a/arch/x86/include/asm/qspinlock_paravirt.h b/arch/x86/include/asm/qspinlock_paravirt.h index 42b17cf10b10..85b6e3609cb9 100644 --- a/arch/x86/include/asm/qspinlock_paravirt.h +++ b/arch/x86/include/asm/qspinlock_paravirt.h @@ -4,6 +4,8 @@ #include +void __lockfunc __pv_queued_spin_unlock_slowpath(struct qspinlock *lock, u8 locked); + /* * For x86-64, PV_CALLEE_SAVE_REGS_THUNK() saves and restores 8 64-bit * registers. For i386, however, only 1 32-bit register needs to be saved diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index ac10b46c5832..eb67aa4cc5ef 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -73,11 +73,13 @@ DEFINE_PARAVIRT_ASM(pv_native_read_cr2, "mov %cr2, %rax", .noinstr.text); DEFINE_STATIC_KEY_TRUE(virt_spin_lock_key); +#ifdef CONFIG_SMP void __init native_pv_lock_init(void) { if (!boot_cpu_has(X86_FEATURE_HYPERVISOR)) static_branch_disable(&virt_spin_lock_key); } +#endif unsigned int paravirt_patch(u8 type, void *insn_buff, unsigned long addr, unsigned int len) diff --git a/kernel/locking/qspinlock_paravirt.h b/kernel/locking/qspinlock_paravirt.h index 6afc249ce697..6a0184e9c234 100644 --- a/kernel/locking/qspinlock_paravirt.h +++ b/kernel/locking/qspinlock_paravirt.h @@ -485,6 +485,16 @@ pv_wait_head_or_lock(struct qspinlock *lock, struct mcs_spinlock *node) return (u32)(atomic_read(&lock->val) | _Q_LOCKED_VAL); } +/* + * Include the architecture specific callee-save thunk of the + * __pv_queued_spin_unlock(). This thunk is put together with + * __pv_queued_spin_unlock() to make the callee-save thunk and the real unlock + * function close to each other sharing consecutive instruction cachelines. + * Alternatively, architecture specific version of __pv_queued_spin_unlock() + * can be defined. + */ +#include + /* * PV versions of the unlock fastpath and slowpath functions to be used * instead of queued_spin_unlock(). @@ -533,16 +543,6 @@ __pv_queued_spin_unlock_slowpath(struct qspinlock *lock, u8 locked) pv_kick(node->cpu); } -/* - * Include the architecture specific callee-save thunk of the - * __pv_queued_spin_unlock(). This thunk is put together with - * __pv_queued_spin_unlock() to make the callee-save thunk and the real unlock - * function close to each other sharing consecutive instruction cachelines. - * Alternatively, architecture specific version of __pv_queued_spin_unlock() - * can be defined. - */ -#include - #ifndef __pv_queued_spin_unlock __visible __lockfunc void __pv_queued_spin_unlock(struct qspinlock *lock) {