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@xxxxxx>
---
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)
