Re: [PATCH v2 2/2] mce: acpi/apei: Add a boot option to disable ffmode for corrected errors
From: Naveen N. Rao
Date: Thu Jun 20 2013 - 15:02:52 EST
On 06/20/2013 01:18 PM, Borislav Petkov wrote:
On Wed, Jun 19, 2013 at 11:27:42PM +0530, Naveen N. Rao wrote:
Add a boot option to disable firmware first mode for corrected errors.
Signed-off-by: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
---
Documentation/x86/x86_64/boot-options.txt | 5 +++++
arch/x86/include/asm/acpi.h | 2 ++
arch/x86/kernel/acpi/boot.c | 5 +++++
drivers/acpi/apei/hest.c | 3 ++-
4 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/Documentation/x86/x86_64/boot-options.txt b/Documentation/x86/x86_64/boot-options.txt
index e9e8ddb..1228b22 100644
--- a/Documentation/x86/x86_64/boot-options.txt
+++ b/Documentation/x86/x86_64/boot-options.txt
@@ -176,6 +176,11 @@ ACPI
acpi=noirq Don't route interrupts
+ acpi=nocmcff Disable firmware first mode for corrected errors. This
+ disables parsing the HEST CMC error source to check if
+ firmware has set the FF flag. This may result in
+ duplicate corrected error reports.
Ok, this option should be called something more vendor-agnostic like
acpi=noff
for example.
CMCI is Intel-specific and Firmware First is a generic way to say that
firmware would like to look at the errors first.
AMD has similar thing called error thresholding so...
nocmcff actually refers to CMC (Corrected Machine Check) Error source
which is APEI terminology, so this is not actually Intel-specific and
should apply equally well for AMD. I chose nocmcff over noff since there
is also a firmware first flag for MCE Error source in APEI and this
option only disables FF for CMC.
Thanks,
Naveen
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/