ipc: add COMPAT_SHMLBA support
authorWill Deacon <will.deacon@arm.com>
Mon, 30 Jul 2012 21:42:38 +0000 (14:42 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 31 Jul 2012 00:25:20 +0000 (17:25 -0700)
commit079a96ae3871f0ed9083aac2218136ccec5b9877
tree52acdeda67006d3d85eee0a17d6241657ba270dc
parent63dca8d5b5ef7effb58b8d6892a024125c0fab0b
ipc: add COMPAT_SHMLBA support

If the SHMLBA definition for a native task differs from the definition for
a compat task, the do_shmat() function would need to handle both.

This patch introduces COMPAT_SHMLBA, which is used by the compat shmat
syscall when calling the ipc code and allows architectures such as AArch64
(where the native SHMLBA is 64k but the compat (AArch32) definition is
16k) to provide the correct semantics for compat IPC system calls.

Cc: David S. Miller <davem@davemloft.net>
Cc: Chris Zankel <chris@zankel.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/sparc/kernel/sys_sparc_64.c
arch/xtensa/kernel/syscall.c
include/linux/shm.h
ipc/compat.c
ipc/shm.c
ipc/syscall.c