[PATCH] compat: fix sys_fanotify_mark

[Heiko Carstens <heiko.carstens@de.ibm.com>]

91c2e0bcae72 "unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE"
added a new unified compat fanotify_mark syscall to be used by all
architectures.
Unfortunately the unified version merges the split mask parameter in a
wrong way: the lower and higher word got swapped.

This was discovered with glibc's tst-fanotify test case.

Reported-by: Andreas Krebbel <krebbel@linux.vnet.ibm.com>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: stable@vger.kernel.org # v3.10+
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---
 fs/notify/fanotify/fanotify_user.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index e44cb6427df3..6663511ab33a 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -888,9 +888,9 @@ COMPAT_SYSCALL_DEFINE6(fanotify_mark,
 {
 	return sys_fanotify_mark(fanotify_fd, flags,
 #ifdef __BIG_ENDIAN
-				((__u64)mask1 << 32) | mask0,
-#else
 				((__u64)mask0 << 32) | mask1,
+#else
+				((__u64)mask1 << 32) | mask0,
 #endif
 				 dfd, pathname);
 }
-- 
1.8.4.5