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authorOleg Nesterov <oleg@tv-sign.ru>2008-07-25 01:47:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:39 -0700
commitc5f1cc8c1828486a61ab3e575da6e2c62b34d399 (patch)
tree9cc88e7d1dae063482e1e9117ded747578cbd7ad /kernel
parent8cd9c249128a59e8e833d454a784b0cbd338d468 (diff)
downloadlinux-2.6.34-ux500-c5f1cc8c1828486a61ab3e575da6e2c62b34d399.tar.gz
coredump: turn core_state->nr_threads into atomic_t
Turn core_state->nr_threads into atomic_t and kill now unneeded down_write(&mm->mmap_sem) in exit_mm(). Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/exit.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 988e232254e..63d82957baa 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -678,10 +678,9 @@ static void exit_mm(struct task_struct * tsk)
down_read(&mm->mmap_sem);
if (mm->core_state) {
up_read(&mm->mmap_sem);
- down_write(&mm->mmap_sem);
- if (!--mm->core_state->nr_threads)
+
+ if (atomic_dec_and_test(&mm->core_state->nr_threads))
complete(&mm->core_state->startup);
- up_write(&mm->mmap_sem);
wait_for_completion(&mm->core_done);
down_read(&mm->mmap_sem);