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authorLinus Torvalds <torvalds@linux-foundation.org>2017-04-03 08:36:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-04-03 08:36:24 -0700
commit3ccfcdc9efe861983d26d56f1f0ecae3f61a3a09 (patch)
tree2dfa18f657e3e84a34f74f36aa0489eac7c8cda9 /arch
parenta71c9a1c779f2499fb2afc0553e543f18aff6edf (diff)
parentcc66afea58f858ff6da7f79b8a595a67bbb4f9a9 (diff)
downloadlinux-3ccfcdc9efe861983d26d56f1f0ecae3f61a3a09.tar.bz2
Merge branch 'ras-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull RAS fix from Thomas Gleixner: "Prevent dmesg from being spammed when MCE logging is active" * 'ras-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mce: Don't print MCEs when mcelog is active
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 8e9725c607ea..5accfbdee3f0 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -54,6 +54,8 @@
static DEFINE_MUTEX(mce_chrdev_read_mutex);
+static int mce_chrdev_open_count; /* #times opened */
+
#define mce_log_get_idx_check(p) \
({ \
RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held() && \
@@ -598,6 +600,10 @@ static int mce_default_notifier(struct notifier_block *nb, unsigned long val,
if (atomic_read(&num_notifiers) > 2)
return NOTIFY_DONE;
+ /* Don't print when mcelog is running */
+ if (mce_chrdev_open_count > 0)
+ return NOTIFY_DONE;
+
__print_mce(m);
return NOTIFY_DONE;
@@ -1828,7 +1834,6 @@ void mcheck_cpu_clear(struct cpuinfo_x86 *c)
*/
static DEFINE_SPINLOCK(mce_chrdev_state_lock);
-static int mce_chrdev_open_count; /* #times opened */
static int mce_chrdev_open_exclu; /* already open exclusive? */
static int mce_chrdev_open(struct inode *inode, struct file *file)