Subject: [PATCH 2/2] exit: move check_stack_usage() to the end of do_exit()

From: Oleg Nesterov <[email-masked]>
Date: Mon, 17 Mar 2014 19:05:10 +0100

It is not clear why check_stack_usage() is called so early and
thus it never checks the stack usage in, say, exit_notify() or
flush_ptrace_hw_breakpoint() or other functions which are only
called by do_exit().

Move the callsite down to the last preempt_disable/schedule.

Signed-off-by: Oleg Nesterov <[email-masked]>
---
 kernel/exit.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index 5d5b472..6d1f245 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -788,7 +788,6 @@ void do_exit(long code)
 		disassociate_ctty(1);
 	exit_task_namespaces(tsk);
 	exit_task_work(tsk);
-	check_stack_usage();
 	exit_thread();
 
 	/*
@@ -842,6 +841,7 @@ void do_exit(long code)
 
 	validate_creds_for_do_exit(tsk);
 
+	check_stack_usage();
 	preempt_disable();
 	if (tsk->nr_dirtied)
 		__this_cpu_add(dirty_throttle_leaks, tsk->nr_dirtied);
-- 
1.5.5.1