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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: 521570
Change-Id: I75356a4b4171ae2888ce6cce792f569b5ca8cdcf
Signed-off-by: Tingting Yang <tingting@codeaurora.org>
This commit is contained in:
Tingting Yang 2013-08-06 11:12:52 +08:00 committed by Stephen Boyd
parent 14ca8f3c0b
commit b6b8ce11c9
1 changed files with 7 additions and 2 deletions
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9
kernel/exit.c
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@ -685,6 +685,7 @@ 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);
@ -693,12 +694,16 @@ static void check_stack_usage(void)
spin_lock(&low_water_lock);
if (free < lowest_to_date) {
lowest_to_date = free;
islower = true;
}
spin_unlock(&low_water_lock);
if (islower) {
printk(KERN_WARNING "%s (%d) used greatest stack depth: "
"%lu bytes left\n",
current->comm, task_pid_nr(current), free);
lowest_to_date = free;
}
spin_unlock(&low_water_lock);
}
#else
static inline void check_stack_usage(void) {}