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[PATCH] unshare: Use rcu_assign_pointer when setting sighand 

The sighand pointer only needs the rcu_read_lock on the
read side.  So only depending on task_lock protection
when setting this pointer is not enough.  We also need
a memory barrier to ensure the initialization is seen first.

Use rcu_assign_pointer as it does this for us, and clearly
documents that we are setting an rcu readable pointer.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Paul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric W. Biederman 2006-03-16 10:31:38 -07:00 committed by Linus Torvalds
parent 232a347a44
commit e0e8eb54d8
1 changed files with 1 additions and 1 deletions
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2
kernel/fork.c
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@ -1569,7 +1569,7 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
if (new_sigh) {
sigh = current->sighand;
current->sighand = new_sigh;
rcu_assign_pointer(current->sighand, new_sigh);
new_sigh = sigh;
}