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ACPI: APEI: GHES: add TAINT_MACHINE_CHECK on GHES panic path

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[ Upstream commit 4734c8b46b ]

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>
This commit is contained in:
Breno Leitao 2025-07-02 08:39:51 -07:00 committed by Greg Kroah-Hartman
parent 5d6e92f8a8
commit 512dc827c2
1 changed files with 2 additions and 0 deletions
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2
drivers/acpi/apei/ghes.c
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@ -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)