From patchwork Mon May 8 11:52:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sunil V L X-Patchwork-Id: 680931 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 4171DC77B73 for ; Mon, 8 May 2023 11:53:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234077AbjEHLxH (ORCPT ); Mon, 8 May 2023 07:53:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233298AbjEHLxF (ORCPT ); Mon, 8 May 2023 07:53:05 -0400 Received: from mail-pl1-x632.google.com (mail-pl1-x632.google.com [IPv6:2607:f8b0:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8A9F661A5 for ; Mon, 8 May 2023 04:53:03 -0700 (PDT) Received: by mail-pl1-x632.google.com with SMTP id d9443c01a7336-1ab1b79d3a7so29575855ad.3 for ; Mon, 08 May 2023 04:53:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1683546783; x=1686138783; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=rfepdXJdsq6ohX2AkAAGDRO8NQz+5w0XQmMbJfl5w48=; b=hWuy+ZiUw1JYUSFzt1E/M+vNy0IUQxsPk5lOKUyv1zV9wOWRmYghioaQiBULlwHm9s jgnGlauoLdXVPoAMoxq4MadMMtFM/J5XWiJ9NMXuPt4LI8V/fO1wX4KQedMz02XonrpK 2bKULo+edMjXoVmEnOJdNrGtOaG6T6fhzIJUjWfnqw8QNcENZyq4HHdpt54CoYg1Mk4i 2xOHuUtc8rMwNFDQWtei/1baL+hX/1cAkLd71vAoyeotWh6p04MycEDBN2sWpxJBT6QD d9zQ+HamS9r+B/LNFexRnGBokTG0UOkQpIbnT55w877Iq/XlSSM5alf3zJLvARbSSt8U ngsg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683546783; x=1686138783; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=rfepdXJdsq6ohX2AkAAGDRO8NQz+5w0XQmMbJfl5w48=; b=D+2gvUk0IUWFDFptoMFtSRN7GdBg4kpCd018e5duTxfThbRHub6+O5G1xwRFHzsYLh LjWm+OC9IFlZlsqPHr4qiq8kD8ihM9peN6tHUYhHm4+Y2swhxBpBYGJhROl2I0vCiNc+ jqmZu1ecUesF/7qWD4u7xDFpsHG6unad0c4JFNqC+5R9NqOt7kUXf57x7NBUyb0lVGGB HNfT+VGLUGj8uPAkmFLseUt7DhleokBMgDt7V1VSRJnIoi0Pm+W1/Dqy0bQFs4xbDvwI SAXsGHnFCqLghalZsgpbjZ63+AeXWUj3veee+IKDBxBvFpqzjQgS/N+x1oJK/YoalV/d nYgA== X-Gm-Message-State: AC+VfDyq00XP/5Raat1SPkHoxXYncjFuaxbg7lAy5JSpZeGEM+rirX0A e6zp3yQBKI+Cc9Pb+giUXTWgQQ== X-Google-Smtp-Source: ACHHUZ6E5oSS35ppin16Fc2D/CJweZplodceAaOSb9zbK0yJSsiHXmdseC+7l9W8CGis6yGw0B7fxg== X-Received: by 2002:a17:902:ceca:b0:1a6:5fa2:3293 with SMTP id d10-20020a170902ceca00b001a65fa23293mr12096226plg.56.1683546783045; Mon, 08 May 2023 04:53:03 -0700 (PDT) Received: from sunil-laptop.. ([106.51.189.144]) by smtp.gmail.com with ESMTPSA id w9-20020a170902904900b001aaed524541sm7015149plz.227.2023.05.08.04.52.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 May 2023 04:53:02 -0700 (PDT) From: Sunil V L To: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, linux-acpi@vger.kernel.org, linux-crypto@vger.kernel.org, platform-driver-x86@vger.kernel.org, llvm@lists.linux.dev Cc: Jonathan Corbet , Paul Walmsley , Palmer Dabbelt , Albert Ou , "Rafael J . Wysocki" , Len Brown , Daniel Lezcano , Thomas Gleixner , Weili Qian , Zhou Wang , Herbert Xu , "David S . Miller" , Marc Zyngier , Maximilian Luz , Hans de Goede , Mark Gross , Nathan Chancellor , Nick Desaulniers , Tom Rix , Jisheng Zhang , Anup Patel , Atish Patra Subject: [PATCH V5 01/21] riscv: move sbi_init() earlier before jump_label_init() Date: Mon, 8 May 2023 17:22:17 +0530 Message-Id: <20230508115237.216337-2-sunilvl@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230508115237.216337-1-sunilvl@ventanamicro.com> References: <20230508115237.216337-1-sunilvl@ventanamicro.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org From: Jisheng Zhang We call jump_label_init() in setup_arch() is to use static key mechanism earlier, but riscv jump label relies on the sbi functions, If we enable static key before sbi_init(), the code path looks like: static_branch_enable() .. arch_jump_label_transform() patch_text_nosync() flush_icache_range() flush_icache_all() sbi_remote_fence_i() for CONFIG_RISCV_SBI case __sbi_rfence() Since sbi isn't initialized, so NULL deference! Here is a typical panic log: [ 0.000000] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [ 0.000000] Oops [#1] [ 0.000000] Modules linked in: [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 5.18.0-rc7+ #79 [ 0.000000] Hardware name: riscv-virtio,qemu (DT) [ 0.000000] epc : 0x0 [ 0.000000] ra : sbi_remote_fence_i+0x1e/0x26 [ 0.000000] epc : 0000000000000000 ra : ffffffff80005826 sp : ffffffff80c03d50 [ 0.000000] gp : ffffffff80ca6178 tp : ffffffff80c0ad80 t0 : 6200000000000000 [ 0.000000] t1 : 0000000000000000 t2 : 62203a6b746e6972 s0 : ffffffff80c03d60 [ 0.000000] s1 : ffffffff80001af6 a0 : 0000000000000000 a1 : 0000000000000000 [ 0.000000] a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000 [ 0.000000] a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000000080200 [ 0.000000] s2 : ffffffff808b3e48 s3 : ffffffff808bf698 s4 : ffffffff80cb2818 [ 0.000000] s5 : 0000000000000001 s6 : ffffffff80c9c345 s7 : ffffffff80895aa0 [ 0.000000] s8 : 0000000000000001 s9 : 000000000000007f s10: 0000000000000000 [ 0.000000] s11: 0000000000000000 t3 : ffffffff80824d08 t4 : 0000000000000022 [ 0.000000] t5 : 000000000000003d t6 : 0000000000000000 [ 0.000000] status: 0000000000000100 badaddr: 0000000000000000 cause: 000000000000000c [ 0.000000] ---[ end trace 0000000000000000 ]--- [ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task! [ 0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]--- Fix this issue by moving sbi_init() earlier before jump_label_init() Signed-off-by: Jisheng Zhang Reviewed-by: Anup Patel Reviewed-by: Atish Patra --- arch/riscv/kernel/setup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c index 36b026057503..9fb839074e16 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -270,6 +270,7 @@ void __init setup_arch(char **cmdline_p) *cmdline_p = boot_command_line; early_ioremap_setup(); + sbi_init(); jump_label_init(); parse_early_param(); @@ -283,7 +284,6 @@ void __init setup_arch(char **cmdline_p) misc_mem_init(); init_resources(); - sbi_init(); #ifdef CONFIG_KASAN kasan_init();