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

[Andi Kleen <andi@firstfloor.org>]

From: Andi Kleen <ak@linux.intel.com>

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@jp.fujitsu.com

Acked-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 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)
 
 tolerant
 	Tolerance level. When a machine check exception occurs for a non
-- 
1.6.0.2