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| author | Arnd Bergmann <arnd@arndb.de> | 2007-07-16 08:41:11 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-16 18:05:48 +0200 |
| commit | 4b7775870b69129e640ed583c9b362d5cd66159d (patch) | |
| tree | 3634c3fb91c927cfd9b4e5751e06463537849ce3 /include/asm-x86_64 | |
| parent | kerneldoc fix in audit_core_dumps (diff) | |
| download | linux-4b7775870b69129e640ed583c9b362d5cd66159d.tar.xz linux-4b7775870b69129e640ed583c9b362d5cd66159d.zip | |
Introduce compat_u64 and compat_s64 types
One common problem with 32 bit system call and ioctl emulation is the
different alignment rules between i386 and 64 bit machines. A number of
drivers work around this by marking the compat structures as
'attribute((packed))', which is not the right solution because it breaks
all the non-x86 architectures that want to use the same compat code.
Hopefully, this patch improves the situation, it introduces two new types,
compat_u64 and compat_s64. These are defined on all architectures to have
the same size and alignment as the 32 bit version of u64 and s64.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Andi Kleen <ak@suse.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Vasily Tarasov <vtaras@openvz.org>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-x86_64')
| -rw-r--r-- | include/asm-x86_64/compat.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-x86_64/compat.h b/include/asm-x86_64/compat.h index b37ab8218ef0..53cb96b68a62 100644 --- a/include/asm-x86_64/compat.h +++ b/include/asm-x86_64/compat.h @@ -33,8 +33,10 @@ typedef s32 compat_key_t; typedef s32 compat_int_t; typedef s32 compat_long_t; +typedef s64 __attribute__((aligned(4))) compat_s64; typedef u32 compat_uint_t; typedef u32 compat_ulong_t; +typedef u64 __attribute__((aligned(4))) compat_u64; struct compat_timespec { compat_time_t tv_sec; |