sched: Check TASK_DEAD rather than EXIT_DEAD in schedule_debug()

schedule_debug() ignores in_atomic() if prev->exit_state != 0.
This is not what we want, ->exit_state is set by exit_notify()
but we should complain until the task does the last schedule()
in TASK_DEAD.

See also 7407251a0e2e "PF_DEAD cleanup", I think this ancient
commit explains why schedule() had to rely on ->exit_state,
until that commit exit_notify() disabled preemption and set
PF_DEAD which was used to detect the exiting task.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: David Laight <David.Laight@ACULAB.COM>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20131113154538.GB15810@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 687985b..19db8f3 100644 (file)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2414,10 +2414,10 @@ static inline void schedule_debug(struct task_struct *prev)
 {
        /*
         * Test if we are atomic. Since do_exit() needs to call into
-        * schedule() atomically, we ignore that path for now.
-        * Otherwise, whine if we are scheduling when we should not be.
+        * schedule() atomically, we ignore that path. Otherwise whine
+        * if we are scheduling when we should not.
         */
-       if (unlikely(in_atomic_preempt_off() && !prev->exit_state))
+       if (unlikely(in_atomic_preempt_off() && prev->state != TASK_DEAD))
                __schedule_bug(prev);
        rcu_sleep_check();