memcg: res_counter_read_u64(): fix potential races on 32-bit machines

res_counter_read_u64 reads u64 value without lock.  It's dangerous in a
32bit environment.  Add locking.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: David Rientjes <rientjes@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index c7eaa37a768b785cf69cd2eb64ab3fb75c052124..34683efa2cceee37f0a76db7531b8f5fc265a325 100644 (file)
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -126,10 +126,24 @@ ssize_t res_counter_read(struct res_counter *counter, int member,
                        pos, buf, s - buf);
 }
 
+#if BITS_PER_LONG == 32
+u64 res_counter_read_u64(struct res_counter *counter, int member)
+{
+       unsigned long flags;
+       u64 ret;
+
+       spin_lock_irqsave(&counter->lock, flags);
+       ret = *res_counter_member(counter, member);
+       spin_unlock_irqrestore(&counter->lock, flags);
+
+       return ret;
+}
+#else
 u64 res_counter_read_u64(struct res_counter *counter, int member)
 {
        return *res_counter_member(counter, member);
 }
+#endif
 
 int res_counter_memparse_write_strategy(const char *buf,
                                        unsigned long long *res)