selinux: drop unnecessary smp_load_acquire() call

In commit 66f8e2f ("selinux: sidtab reverse lookup hash table") the
corresponding load is moved under the spin lock, so there is no race
possible and we can read the count directly. The smp_store_release() is
still needed to avoid racing with the lock-free readers.

Signed-off-by: Ondrej Mosnacek <[email protected]>
Signed-off-by: Paul Moore <[email protected]>

Author: WOnder93

security/selinux/ss/sidtab.c

@@ -276,8 +276,7 @@ int sidtab_context_to_sid(struct sidtab *s, struct context *context,
 	if (*sid)
 		goto out_unlock;
 
-	/* read entries only after reading count */
-	count = smp_load_acquire(&s->count);
+	count = s->count;
 	convert = s->convert;
 
 	/* bail out if we already reached max entries */