From: linke li <lilinke99@qq.com>
Cc: xujianhao01@gmail.com, linke li <lilinke99@qq.com>,
Ard Biesheuvel <ardb@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] x86/efi: mark racy access on efi_rts_work.efi_rts_id
Date: Sat, 27 Apr 2024 13:25:07 +0800 [thread overview]
Message-ID: <tencent_E910110547D287B13FEDB6E161D8874E6E06@qq.com> (raw)
In efi_crash_gracefully_on_page_fault(), efi_rts_work.efi_rts_id can by
changed by other thread from the comment. Mark possible data race on
efi_rts_work.efi_rts_id as benign using READ_ONCE.
This patch is aimed at reducing the number of benign races reported by
KCSAN in order to focus future debugging effort on harmful races.
Signed-off-by: linke li <lilinke99@qq.com>
---
arch/x86/platform/efi/quirks.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c
index f0cc00032751..4acb81700caf 100644
--- a/arch/x86/platform/efi/quirks.c
+++ b/arch/x86/platform/efi/quirks.c
@@ -751,7 +751,7 @@ void efi_crash_gracefully_on_page_fault(unsigned long phys_addr)
* because this case occurs *very* rarely and hence could be improved
* on a need by basis.
*/
- if (efi_rts_work.efi_rts_id == EFI_RESET_SYSTEM) {
+ if (READ_ONCE(efi_rts_work.efi_rts_id) == EFI_RESET_SYSTEM) {
pr_info("efi_reset_system() buggy! Reboot through BIOS\n");
machine_real_restart(MRR_BIOS);
return;
--
2.39.3 (Apple Git-146)
next reply other threads:[~2024-04-27 5:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-27 5:25 linke li [this message]
2024-04-29 15:40 ` [PATCH] x86/efi: mark racy access on efi_rts_work.efi_rts_id Ard Biesheuvel
2024-05-01 2:59 ` linke li
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