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 <eparis@redhat.com>

diff --git a/include/linux/fanotify.h b/include/linux/fanotify.h
index 2c89ce7..8a621c1 100644 (file)
--- 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;