diff options
author | Michel Lespinasse <[email protected]> | 2011-03-10 18:47:31 -0800 |
---|---|---|
committer | Thomas Gleixner <[email protected]> | 2011-03-11 12:23:08 +0100 |
commit | 522d7decc0370070448a8c28982c8dfd8970489e (patch) | |
tree | 0f964a23a28b9dcf2d1fad3096f549c93c68b605 | |
parent | c0c9ed15042ceac7c485813012a0a97316101b57 (diff) |
futex: Remove redundant pagefault_disable in futex_atomic_cmpxchg_inatomic()
kernel/futex.c disables page faults before calling
futex_atomic_cmpxchg_inatomic(), so there is no need to do it again
within that function.
Signed-off-by: Michel Lespinasse <[email protected]>
Cc: Darren Hart <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Matt Turner <[email protected]>
Cc: Russell King <[email protected]>
Cc: David Howells <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: "James E.J. Bottomley" <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Paul Mundt <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Chris Metcalf <[email protected]>
Cc: Linus Torvalds <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
-rw-r--r-- | arch/arm/include/asm/futex.h | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/arm/include/asm/futex.h b/arch/arm/include/asm/futex.h index b33fe7065b38..7133a8620830 100644 --- a/arch/arm/include/asm/futex.h +++ b/arch/arm/include/asm/futex.h @@ -95,7 +95,8 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) return -EFAULT; - pagefault_disable(); /* implies preempt_disable() */ + /* Note that preemption is disabled by futex_atomic_cmpxchg_inatomic + * call sites. */ __asm__ __volatile__("@futex_atomic_cmpxchg_inatomic\n" "1: " T(ldr) " %0, [%3]\n" @@ -115,8 +116,6 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) : "r" (oldval), "r" (newval), "r" (uaddr), "Ir" (-EFAULT) : "cc", "memory"); - pagefault_enable(); /* subsumes preempt_enable() */ - return val; } |