| From 58b8516633c517eeca237aaa2d481086fbdad113 Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Wed, 2 Jul 2025 08:39:51 -0700 |
| Subject: ACPI: APEI: GHES: add TAINT_MACHINE_CHECK on GHES panic path |
| |
| From: Breno Leitao <leitao@debian.org> |
| |
| [ 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 <leitao@debian.org> |
| Reviewed-by: Tony Luck <tony.luck@intel.com> |
| Link: https://patch.msgid.link/20250702-add_tain-v1-1-9187b10914b9@debian.org |
| Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
| Signed-off-by: Sasha Levin <sashal@kernel.org> |
| --- |
| 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 1f327ec4c30b..3c862acaa28a 100644 |
| --- a/drivers/acpi/apei/ghes.c |
| +++ b/drivers/acpi/apei/ghes.c |
| @@ -860,6 +860,8 @@ 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) |
| -- |
| 2.39.5 |
| |
