Merge branch 'linus' into x86/mce3

[sfrench/cifs-2.6.git] / Documentation / x86 / x86_64 / boot-options.txt

diff --git a/Documentation/x86/x86_64/boot-options.txt b/Documentation/x86/x86_64/boot-options.txt
index 34c13040a718f6febbccadc1f32bc24f4a060664..29a6ff8bc7d34f02c99c402e048851ab3715a995 100644 (file)
--- 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
 
@@ -150,11 +180,6 @@ NUMA
                Otherwise, the remaining system RAM is allocated to an
                additional node.
 
-  numa=hotadd=percent
-               Only allow hotadd memory to preallocate page structures upto
-               percent of already available memory.
-               numa=hotadd=0 will disable hotadd memory.
-
 ACPI
 
   acpi=off     Don't enable ACPI