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authorOleg Nesterov <oleg@tv-sign.ru>2006-09-29 02:01:10 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 09:18:20 -0700
commit55a101f8f71a3d3dbda7b5c77083ffe47552f831 (patch)
tree52706df201efd82d09bed39562502b4caa357af4 /kernel
parent29b884921634e1e01cbd276e1c9b8fc07a7e4a90 (diff)
downloadlinux-55a101f8f71a3d3dbda7b5c77083ffe47552f831.tar.gz
[PATCH] kill PF_DEAD flag
After the previous change (->flags & PF_DEAD) <=> (->state == EXIT_DEAD), we don't need PF_DEAD any longer. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/exit.c6
-rw-r--r--kernel/sched.c16
2 files changed, 10 insertions, 12 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 3d759c98fb1..9dd5f1336da 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -953,10 +953,8 @@ fastcall NORET_TYPE void do_exit(long code)
if (tsk->splice_pipe)
__free_pipe_info(tsk->splice_pipe);
- /* PF_DEAD causes final put_task_struct after we schedule. */
preempt_disable();
- BUG_ON(tsk->flags & PF_DEAD);
- tsk->flags |= PF_DEAD;
+ /* causes final put_task_struct in finish_task_switch(). */
tsk->state = EXIT_DEAD;
schedule();
@@ -972,7 +970,7 @@ NORET_TYPE void complete_and_exit(struct completion *comp, long code)
{
if (comp)
complete(comp);
-
+
do_exit(code);
}
diff --git a/kernel/sched.c b/kernel/sched.c
index e1646b044b6..a9405d7cc6a 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1755,27 +1755,27 @@ static inline void finish_task_switch(struct rq *rq, struct task_struct *prev)
__releases(rq->lock)
{
struct mm_struct *mm = rq->prev_mm;
- unsigned long prev_task_flags;
+ long prev_state;
rq->prev_mm = NULL;
/*
* A task struct has one reference for the use as "current".
- * If a task dies, then it sets EXIT_ZOMBIE in tsk->exit_state and
- * calls schedule one last time. The schedule call will never return,
- * and the scheduled task must drop that reference.
- * The test for EXIT_ZOMBIE must occur while the runqueue locks are
+ * If a task dies, then it sets EXIT_DEAD in tsk->state and calls
+ * schedule one last time. The schedule call will never return, and
+ * the scheduled task must drop that reference.
+ * The test for EXIT_DEAD must occur while the runqueue locks are
* still held, otherwise prev could be scheduled on another cpu, die
* there before we look at prev->state, and then the reference would
* be dropped twice.
* Manfred Spraul <manfred@colorfullife.com>
*/
- prev_task_flags = prev->flags;
+ prev_state = prev->state;
finish_arch_switch(prev);
finish_lock_switch(rq, prev);
if (mm)
mmdrop(mm);
- if (unlikely(prev_task_flags & PF_DEAD)) {
+ if (unlikely(prev_state == EXIT_DEAD)) {
/*
* Remove function-return probe instances associated with this
* task and put them back on the free list.
@@ -5153,7 +5153,7 @@ static void migrate_dead(unsigned int dead_cpu, struct task_struct *p)
BUG_ON(p->exit_state != EXIT_ZOMBIE && p->exit_state != EXIT_DEAD);
/* Cannot have done final schedule yet: would have vanished. */
- BUG_ON(p->flags & PF_DEAD);
+ BUG_ON(p->state == EXIT_DEAD);
get_task_struct(p);