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Subject[PATCH 04/20] fanotify: use __aligned_u64 in fanotify userspace metadata
Currently the userspace struct exposed by fanotify uses
__attribute__((packed)) to make sure that alignment works on multiarch
platforms. Since this causes a severe performance penalty on some
platforms we are going to switch to using explicit alignment notation on
the 64bit values so we don't have to use 'packed'

Signed-off-by: Eric Paris <>

include/linux/fanotify.h | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/fanotify.h b/include/linux/fanotify.h
index 2c89ce7..8a621c1 100644
--- a/include/linux/fanotify.h
+++ b/include/linux/fanotify.h
@@ -79,10 +79,10 @@
struct fanotify_event_metadata {
__u32 event_len;
__u32 vers;
- __u64 mask;
+ __aligned_u64 mask;
__s32 fd;
__s32 pid;
-} __attribute__ ((packed));

struct fanotify_response {
__s32 fd;

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