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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2008-07-25 01:47:42 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-25 10:53:39 -0700 |
| commit | c5f1cc8c1828486a61ab3e575da6e2c62b34d399 (patch) | |
| tree | 9cc88e7d1dae063482e1e9117ded747578cbd7ad /kernel/exit.c | |
| parent | 8cd9c249128a59e8e833d454a784b0cbd338d468 (diff) | |
| download | op-kernel-dev-c5f1cc8c1828486a61ab3e575da6e2c62b34d399.zip op-kernel-dev-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/exit.c')
| -rw-r--r-- | kernel/exit.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 988e232..63d8295 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); |
