Update from upstream with manual merge of Yasunori Goto's

changes to swiotlb.c made in commit 281dd25cdc0d6903929b79183816d151ea626341
since this file has been moved from arch/ia64/lib/swiotlb.c to
lib/swiotlb.c

Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/locks.c b/fs/locks.c
index c2c09b4798d6..f7daa5f48949 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -124,6 +124,7 @@
 #include <linux/smp_lock.h>
 #include <linux/syscalls.h>
 #include <linux/time.h>
+#include <linux/rcupdate.h>
 
 #include <asm/semaphore.h>
 #include <asm/uaccess.h>
@@ -2205,6 +2206,7 @@ void steal_locks(fl_owner_t from)
 
         lock_kernel();
         j = 0;
+        rcu_read_lock();
         fdt = files_fdtable(files);
         for (;;) {
                 unsigned long set;
@@ -2222,6 +2224,7 @@ void steal_locks(fl_owner_t from)
                         set >>= 1;
                 }
         }
+        rcu_read_unlock();
         unlock_kernel();
 }
 EXPORT_SYMBOL(steal_locks);