From 079a96ae3871f0ed9083aac2218136ccec5b9877 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Mon, 30 Jul 2012 14:42:38 -0700 Subject: 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 Cc: Chris Zankel Cc: Arnd Bergmann Acked-by: Catalin Marinas Signed-off-by: Will Deacon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/sparc/kernel/sys_sparc_64.c | 2 +- arch/xtensa/kernel/syscall.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) (limited to 'arch') diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c index c38e5aaae56..0dc1f578608 100644 --- a/arch/sparc/kernel/sys_sparc_64.c +++ b/arch/sparc/kernel/sys_sparc_64.c @@ -470,7 +470,7 @@ SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second switch (call) { case SHMAT: { ulong raddr; - err = do_shmat(first, ptr, (int)second, &raddr); + err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA); if (!err) { if (put_user(raddr, (ulong __user *) third)) diff --git a/arch/xtensa/kernel/syscall.c b/arch/xtensa/kernel/syscall.c index 816e6d0d686..05b3f093d5d 100644 --- a/arch/xtensa/kernel/syscall.c +++ b/arch/xtensa/kernel/syscall.c @@ -44,7 +44,7 @@ asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg) unsigned long ret; long err; - err = do_shmat(shmid, shmaddr, shmflg, &ret); + err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA); if (err) return err; return (long)ret; -- cgit v1.2.3