x86/mce: Don't print MCEs when mcelog is active

[mirror_ubuntu-zesty-kernel.git] / arch / x86 / kernel / cpu / mcheck / mce.c

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 537c6647d84ca3e7cca771feb6c98bda94ef8c70..036fc03aefbd878b727c153304bde7019faadab2 100644 (file)
--- 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() && \
@@ -601,6 +603,10 @@ 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;
@@ -1871,7 +1877,6 @@ 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)