From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Sun, 30 Oct 2005 23:02:47 +0000 (-0800)
Subject: [PATCH] coredump_wait() cleanup
X-Git-Tag: v2.6.15-rc1~59^2~15^2~72
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2384f55f8aa520172c995965bd2f8a9740d53095;p=linux-2.6

[PATCH] coredump_wait() cleanup

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>
---

diff --git a/fs/exec.c b/fs/exec.c
index fc02dadc60..6d9521636a 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -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);
 }