commit 1a538b3997d39f27947117e7d14c993691e8a2ed
author Tingting Yang <tingting@codeaurora.org> Tue Aug 06 11:12:52 2013 +0800
committer Gerrit - the friendly Code Review server <code-review@localhost> Wed Jun 20 22:38:09 2018 -0700
tree 133ce27b708aaaa33fdc5c67f90376af78c4cfeb
parent eddc683bb510e9304293e3aebda5971e86d67dd7

msm: move printk out of spin lock low_water_lock

cpu3 stuck in printk more time in spin lock low_water_lock cause cpu0
get spin lock fail and system crashed.

CRs-Fixed: 969097
Change-Id: I75356a4b4171ae2888ce6cce792f569b5ca8cdcf
Signed-off-by: Tingting Yang <tingting@codeaurora.org>
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: Minming Qi <mqi@codeaurora.org>

kernel/exit.c

diff --git a/kernel/exit.c b/kernel/exit.c
index 2c18194..ee8c601 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -717,6 +717,7 @@ static void check_stack_usage(void)
 	static DEFINE_SPINLOCK(low_water_lock);
 	static int lowest_to_date = THREAD_SIZE;
 	unsigned long free;
+	int islower = false;
 
 	free = stack_not_used(current);
 
@@ -725,11 +726,15 @@ static void check_stack_usage(void)
 
 	spin_lock(&low_water_lock);
 	if (free < lowest_to_date) {
-		pr_info("%s (%d) used greatest stack depth: %lu bytes left\n",
-			current->comm, task_pid_nr(current), free);
 		lowest_to_date = free;
+		islower = true;
 	}
 	spin_unlock(&low_water_lock);
+
+	if (islower) {
+		pr_info("%s (%d) used greatest stack depth: %lu bytes left\n",
+				current->comm, task_pid_nr(current), free);
+	}
 }
 #else
 static inline void check_stack_usage(void) {}