[PATCH] stack usage: Add pid to warning printk in check_stack_usage

[Tim Bird <tim.bird@am.sony.com>]

In embedded systems, sometimes the same program (busybox)
is the cause of multiple warnings.  Outputting the pid
with the program name in the warning printk helps
distinguish which instances of a program are using
the stack most.

This is a small patch, but useful.

Signed-off-by: Tim Bird <tim.bird@am.sony.com>
---
 exit.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index b8a6a09..bad923d 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -898,9 +898,9 @@ static void check_stack_usage(void)

 	spin_lock(&low_water_lock);
 	if (free < lowest_to_date) {
-		printk(KERN_WARNING "%s used greatest stack depth: %lu bytes "
-				"left\n",
-				current->comm, free);
+		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);