4.4-stable review patch. If anyone has any objections, please let me know.
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From: Dewet Thibaut thibaut.dewet@nokia.com
commit fbdb328c6bae0a7c78d75734a738b66b86dffc96 upstream.
commit b3b7c4795c ("x86/MCE: Serialize sysfs changes") introduced a min interval limitation when setting the check interval for polled MCEs. However, the logic is that 0 disables polling for corrected MCEs, see Documentation/x86/x86_64/machinecheck. The limitation prevents disabling.
Remove this limitation and allow the value 0 to disable polling again.
Fixes: b3b7c4795c ("x86/MCE: Serialize sysfs changes") Signed-off-by: Dewet Thibaut thibaut.dewet@nokia.com Signed-off-by: Alexander Sverdlin alexander.sverdlin@nokia.com [ Massage commit message. ] Signed-off-by: Borislav Petkov bp@suse.de Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: Tony Luck tony.luck@intel.com Cc: linux-edac linux-edac@vger.kernel.org Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/20180716084927.24869-1-alexander.sverdlin@nokia.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/kernel/cpu/mcheck/mce.c | 3 --- 1 file changed, 3 deletions(-)
--- a/arch/x86/kernel/cpu/mcheck/mce.c +++ b/arch/x86/kernel/cpu/mcheck/mce.c @@ -2294,9 +2294,6 @@ static ssize_t store_int_with_restart(st if (check_interval == old_check_interval) return ret;
- if (check_interval < 1) - check_interval = 1; - mutex_lock(&mce_sysfs_mutex); mce_restart(); mutex_unlock(&mce_sysfs_mutex);