From 512dc827c28ce4c88c643dd9d971689908fc437f Mon Sep 17 00:00:00 2001 From: Breno Leitao Date: Wed, 2 Jul 2025 08:39:51 -0700 Subject: [PATCH] ACPI: APEI: GHES: add TAINT_MACHINE_CHECK on GHES panic path [ Upstream commit 4734c8b46b901cff2feda8b82abc710b65dc31c1 ] When a GHES (Generic Hardware Error Source) triggers a panic, add the TAINT_MACHINE_CHECK taint flag to the kernel. This explicitly marks the kernel as tainted due to a machine check event, improving diagnostics and post-mortem analysis. The taint is set with LOCKDEP_STILL_OK to indicate lockdep remains valid. At large scale deployment, this helps to quickly determine panics that are coming due to hardware failures. Signed-off-by: Breno Leitao Reviewed-by: Tony Luck Link: https://patch.msgid.link/20250702-add_tain-v1-1-9187b10914b9@debian.org Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin --- drivers/acpi/apei/ghes.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index 281a0a2f6730b..bda33a0f0a013 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -1099,6 +1099,8 @@ static void __ghes_panic(struct ghes *ghes, __ghes_print_estatus(KERN_EMERG, ghes->generic, estatus); + add_taint(TAINT_MACHINE_CHECK, LOCKDEP_STILL_OK); + ghes_clear_estatus(ghes, estatus, buf_paddr, fixmap_idx); if (!panic_timeout) -- 2.47.3