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


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.


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