UAPI: fix endianness conditionals in linux/raid/md_p.h

In the UAPI header files, __BIG_ENDIAN and __LITTLE_ENDIAN must be
compared against __BYTE_ORDER in preprocessor conditionals where these are
exposed to userspace (that is they're not inside __KERNEL__ conditionals).

However, in the main kernel the norm is to check for
"defined(__XXX_ENDIAN)" rather than comparing against __BYTE_ORDER and
this has incorrectly leaked into the userspace headers.

The definition of struct mdp_superblock_s in linux/raid/md_p.h is wrong in
this way.  Note that userspace will likely interpret the ordering of the
fields incorrectly as the big-endian variant on a little-endian machines -
depending on header inclusion order.

[!!!] NOTE [!!!]  This patch may adversely change the userspace API.  It might
be better to fix the ordering of events_hi, events_lo, cp_events_hi and
cp_events_lo in struct mdp_superblock_s / typedef mdp_super_t.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: NeilBrown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/include/uapi/linux/raid/md_p.h b/include/uapi/linux/raid/md_p.h
index ee753536ab70..fe1a5406d4d9 100644
--- a/include/uapi/linux/raid/md_p.h
+++ b/include/uapi/linux/raid/md_p.h
@@ -145,16 +145,18 @@ typedef struct mdp_superblock_s {
         __u32 failed_disks;     /*  4 Number of failed disks                  */
         __u32 spare_disks;      /*  5 Number of spare disks                   */
         __u32 sb_csum;          /*  6 checksum of the whole superblock        */
-#ifdef __BIG_ENDIAN
+#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : defined(__BIG_ENDIAN)
         __u32 events_hi;        /*  7 high-order of superblock update count   */
         __u32 events_lo;        /*  8 low-order of superblock update count    */
         __u32 cp_events_hi;     /*  9 high-order of checkpoint update count   */
         __u32 cp_events_lo;     /* 10 low-order of checkpoint update count    */
-#else
+#elif defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN)
         __u32 events_lo;        /*  7 low-order of superblock update count    */
         __u32 events_hi;        /*  8 high-order of superblock update count   */
         __u32 cp_events_lo;     /*  9 low-order of checkpoint update count    */
         __u32 cp_events_hi;     /* 10 high-order of checkpoint update count   */
+#else
+#error unspecified endianness
 #endif
         __u32 recovery_cp;      /* 11 recovery checkpoint sector count        */
         /* There are only valid for minor_version > 90 */