---

yaml --- r: 105939 b: refs/heads/master c: c5f1cc8 h: refs/heads/master i: 105937: 537f798 105935: 35f0841 v: v3
git-mirror · Jul 25, 2008 · c2ea9cc · c2ea9cc
1 parent c29c50a
commit c2ea9cc
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Showing 4 changed files with 5 additions and 6 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8cd9c249128a59e8e833d454a784b0cbd338d468
+refs/heads/master: c5f1cc8c1828486a61ab3e575da6e2c62b34d399
diff --git a/trunk/fs/exec.c b/trunk/fs/exec.c
@@ -1591,7 +1591,7 @@ static inline int zap_threads(struct task_struct *tsk, struct mm_struct *mm,
 	}
 	rcu_read_unlock();
 done:
-	core_state->nr_threads = nr;
+	atomic_set(&core_state->nr_threads, nr);
 	return nr;
 }
 

diff --git a/trunk/include/linux/mm_types.h b/trunk/include/linux/mm_types.h
@@ -160,7 +160,7 @@ struct vm_area_struct {
 };
 
 struct core_state {
-	int nr_threads;
+	atomic_t nr_threads;
 	struct completion startup;
 };
 

diff --git a/trunk/kernel/exit.c b/trunk/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);