AcoSail/kernel_optimize_test
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[PATCH] coredump_wait() cleanup

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This patch deletes pointless code from coredump_wait().

1. It does useless mm->core_waiters inc/dec under mm->mmap_sem,
   but any changes to ->core_waiters have no effect until we drop
   ->mmap_sem.

2. It calls yield() for absolutely unknown reason.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Oleg Nesterov 2005-10-30 15:02:47 -08:00 committed by Linus Torvalds
parent 7407251a0e
commit 2384f55f8a
1 changed files with 5 additions and 8 deletions
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13
fs/exec.c
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@ -1417,19 +1417,16 @@ static void zap_threads (struct mm_struct *mm)
static void coredump_wait(struct mm_struct *mm)
{
DECLARE_COMPLETION(startup_done);
int core_waiters;
mm->core_waiters++; /* let other threads block */
mm->core_startup_done = &startup_done;
/* give other threads a chance to run: */
yield();
zap_threads(mm);
if (--mm->core_waiters) {
up_write(&mm->mmap_sem);
core_waiters = mm->core_waiters;
up_write(&mm->mmap_sem);
if (core_waiters)
wait_for_completion(&startup_done);
} else
up_write(&mm->mmap_sem);
BUG_ON(mm->core_waiters);
}