Merge branch 'x86-mce-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-mce-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (80 commits)
  x86, mce: Add boot options for corrected errors
  x86, mce: Fix mce printing
  x86, mce: fix for mce counters
  x86, mce: support action-optional machine checks
  x86, mce: define MCE_VECTOR
  x86, mce: rename mce_notify_user to mce_notify_irq
  x86: fix panic with interrupts off (needed for MCE)
  x86, mce: export MCE severities coverage via debugfs
  x86, mce: implement new status bits
  x86, mce: print header/footer only once for multiple MCEs
  x86, mce: default to panic timeout for machine checks
  x86, mce: improve mce_get_rip
  x86, mce: make non Monarch panic message "Fatal machine check" too
  x86, mce: switch x86 machine check handler to Monarch election.
  x86, mce: implement panic synchronization
  x86, mce: implement bootstrapping for machine check wakeups
  x86, mce: check early in exception handler if panic is needed
  x86, mce: add table driven machine check grading
  x86, mce: remove TSC print heuristic
  x86, mce: log corrected errors when panicing
  ...

2 files changed, 44 insertions, 8 deletions

diff --git a/Documentation/x86/x86_64/boot-options.txt b/Documentation/x86/x86_64/boot-options.txt
index 2db5893d6c9..29a6ff8bc7d 100644
--- a/Documentation/x86/x86_64/boot-options.txt
+++ b/Documentation/x86/x86_64/boot-options.txt
@@ -5,21 +5,51 @@ only the AMD64 specific ones are listed here.
 
 Machine check
 
-   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.
-               If your BIOS doesn't do that it's a good idea to enable though
-               to make sure you log even machine check events that result
-               in a reboot. On Intel systems it is enabled by default.
+   Please see Documentation/x86/x86_64/machinecheck for sysfs runtime tunables.
+
+   mce=off
+		Disable machine check
+   mce=no_cmci
+		Disable CMCI(Corrected Machine Check Interrupt) that
+		Intel processor supports.  Usually this disablement is
+		not recommended, but it might be handy if your hardware
+		is misbehaving.
+		Note that you'll get more problems without CMCI than with
+		due to the shared banks, i.e. you might get duplicated
+		error logs.
+   mce=dont_log_ce
+		Don't make logs for corrected errors.  All events reported
+		as corrected are silently cleared by OS.
+		This option will be useful if you have no interest in any
+		of corrected errors.
+   mce=ignore_ce
+		Disable features for corrected errors, e.g. polling timer
+		and CMCI.  All events reported as corrected are not cleared
+		by OS and remained in its error banks.
+		Usually this disablement is not recommended, however if
+		there is an agent checking/clearing corrected errors
+		(e.g. BIOS or hardware monitoring applications), conflicting
+		with OS's error handling, and you cannot deactivate the agent,
+		then this option will be a help.
+   mce=bootlog
+		Enable logging of machine checks left over from booting.
+		Disabled by default on AMD because some BIOS leave bogus ones.
+		If your BIOS doesn't do that it's a good idea to enable though
+		to make sure you log even machine check events that result
+		in a reboot. On Intel systems it is enabled by default.
    mce=nobootlog
 		Disable boot machine check logging.
-   mce=tolerancelevel (number)
+   mce=tolerancelevel[,monarchtimeout] (number,number)
+		tolerance levels:
 		0: always panic on uncorrected errors, log corrected errors
 		1: panic or SIGBUS on uncorrected errors, log corrected errors
 		2: SIGBUS or log uncorrected errors, log corrected errors
 		3: never panic or SIGBUS, log all errors (for testing only)
 		Default is 1
 		Can be also set using sysfs which is preferable.
+		monarchtimeout:
+		Sets the time in us to wait for other CPUs on machine checks. 0
+		to disable.
 
    nomce (for compatibility with i386): same as mce=off
 
diff --git a/Documentation/x86/x86_64/machinecheck b/Documentation/x86/x86_64/machinecheck
index a05e58e7b15..b1fb3027328 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
@@ -67,6 +69,10 @@ trigger
 	Program to run when a machine check event is detected.
 	This is an alternative to running mcelog regularly from cron
 	and allows to detect events faster.
+monarch_timeout
+	How long to wait for the other CPUs to machine check too on a
+	exception. 0 to disable waiting for other CPUs.
+	Unit: us
 
 TBD document entries for AMD threshold interrupt configuration