5.4-stable review patch. If anyone has any objections, please let me know.
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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 50bed5a70812..d02d7cbab387 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -709,6 +709,8 @@ 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)