Commit 415586c9 authored by David Howells's avatar David Howells Committed by Linus Torvalds

UAPI: fix endianness conditionals in M32R's asm/stat.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 stat64 in M32R's asm/stat.h is wrong in this way.
 Note that userspace will likely interpret the field order incorrectly as
the big-endian variant on 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 st_blocks and __pad4 in struct stat64.
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ca044f9a
......@@ -63,10 +63,10 @@ struct stat64 {
long long st_size;
unsigned long st_blksize;
#if defined(__BIG_ENDIAN)
#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : defined(__BIG_ENDIAN)
unsigned long __pad4; /* future possible st_blocks high bits */
unsigned long st_blocks; /* Number 512-byte blocks allocated. */
#elif defined(__LITTLE_ENDIAN)
#elif defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN)
unsigned long st_blocks; /* Number 512-byte blocks allocated. */
unsigned long __pad4; /* future possible st_blocks high bits */
#else
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment