[PATCH 20/31] x86: MCE: Improve documentation

From: Andi Kleen
Date: Tue May 26 2009 - 19:59:43 EST

From: Andi Kleen <ak@xxxxxxxxxxxxxxx>

Document that check_interval set to 0 means no polling.
Noticed by Hidetoshi Seto

Also add a reference from boot options to the sysfs tunables

Cc: seto.hidetoshi@xxxxxxxxxxxxxx

Acked-by: Hidetoshi Seto <seto.hidetoshi@xxxxxxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Documentation/x86/x86_64/boot-options.txt | 2 ++
Documentation/x86/x86_64/machinecheck | 4 +++-
2 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/Documentation/x86/x86_64/boot-options.txt b/Documentation/x86/x86_64/boot-options.txt
index e97ebe4..9fb1f4f 100644
--- a/Documentation/x86/x86_64/boot-options.txt
+++ b/Documentation/x86/x86_64/boot-options.txt
@@ -5,6 +5,8 @@ only the AMD64 specific ones are listed here.

Machine check

+ Please see Documentation/x86/x86_64/machinecheck for sysfs runtime tunables.
mce=off disable machine check
mce=bootlog Enable logging of machine checks left over from booting.
Disabled by default on AMD because some BIOS leave bogus ones.
diff --git a/Documentation/x86/x86_64/machinecheck b/Documentation/x86/x86_64/machinecheck
index bec2af3..b1fb302 100644
--- a/Documentation/x86/x86_64/machinecheck
+++ b/Documentation/x86/x86_64/machinecheck
@@ -41,7 +41,9 @@ check_interval
the polling interval. When the poller stops finding MCEs, it
triggers an exponential backoff (poll less often) on the polling
interval. The check_interval variable is both the initial and
- maximum polling interval.
+ maximum polling interval. 0 means no polling for corrected machine
+ check errors (but some corrected errors might be still reported
+ in other ways)

Tolerance level. When a machine check exception occurs for a non

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/