X-Git-Url: http://git.osdn.net/view?a=blobdiff_plain;f=kernel%2Fwatchdog.c;h=c1e0b5f429b6b91c9b80c0173f8c8668541fbde8;hb=fd97ed8c874dc479d868ad33311ad227ff0c98ee;hp=18f34cf75f741e2a63db6dc6c522dfa2e03d1a54;hpb=665ddeb210c10f4daf8ffbe07072771c0020af3a;p=sagit-ice-cold%2Fkernel_xiaomi_msm8998.git

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 18f34cf75f74..c1e0b5f429b6 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -328,7 +328,6 @@ static void watchdog_overflow_callback(struct perf_event *event,
 	 */
 	if (is_hardlockup()) {
 		int this_cpu = smp_processor_id();
-		struct pt_regs *regs = get_irq_regs();
 
 		/* only print hardlockups once */
 		if (__this_cpu_read(hard_watchdog_warn) == true)
@@ -907,6 +906,9 @@ static int proc_watchdog_common(int which, struct ctl_table *table, int write,
 		 * both lockup detectors are disabled if proc_watchdog_update()
 		 * returns an error.
 		 */
+		if (old == new)
+			goto out;
+
 		err = proc_watchdog_update();
 	}
 out:
@@ -951,7 +953,7 @@ int proc_soft_watchdog(struct ctl_table *table, int write,
 int proc_watchdog_thresh(struct ctl_table *table, int write,
 			 void __user *buffer, size_t *lenp, loff_t *ppos)
 {
-	int err, old;
+	int err, old, new;
 
 	get_online_cpus();
 	mutex_lock(&watchdog_proc_mutex);
@@ -971,6 +973,10 @@ int proc_watchdog_thresh(struct ctl_table *table, int write,
 	/*
 	 * Update the sample period. Restore on failure.
 	 */
+	new = ACCESS_ONCE(watchdog_thresh);
+	if (old == new)
+		goto out;
+
 	set_sample_period();
 	err = proc_watchdog_update();
 	if (err) {