On Tue, 26 Mar 2013 11:35:33 -0700 Andrew Morton <a...@linux-foundation.org>
wrote:
> Do we need the locking at all? What does it actually do?
>
> sem_lock_and_putref(sma);
> if (sma->sem_perm.deleted) {
> sem_unlock(sma, -1);
> err = -EIDRM;
> goto out_free;
> }
> sem_unlock(sma, -1);
>
> We're taking the lock, testing an int and then dropping the lock.
> What's the point in that?
Rikpoke.
The new semctl_main() is now taking a lock, testing
sma->sem_perm.deleted then dropping that lock. It looks wrong. What
is that lock testing against? What prevents .deleted from changing
value 1ns after we dropped that lock?
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