x86, mce: improve documentation

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

Acked-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/Documentation/x86/x86_64/boot-options.txt b/Documentation/x86/x86_64/boot-options.txt
index 34c1304..63fca71 100644 (file)
--- 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 a05e58e..a4fdb25 100644 (file)
--- 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)
 
 tolerant
        Tolerance level. When a machine check exception occurs for a non