From ed574e2bbd81ec20134059fb5e17acbc76387270 Mon Sep 17 00:00:00 2001 From: Vineet Gupta Date: Wed, 5 Aug 2015 19:23:34 +0530 Subject: [PATCH] ARC: futex cosmetics Cc: Peter Zijlstra (Intel) Cc: Thomas Gleixner Cc: Michel Lespinasse Signed-off-by: Vineet Gupta --- arch/arc/include/asm/futex.h | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/arch/arc/include/asm/futex.h b/arch/arc/include/asm/futex.h index 9de18a526aff..14b1c9aaf455 100644 --- a/arch/arc/include/asm/futex.h +++ b/arch/arc/include/asm/futex.h @@ -94,6 +94,7 @@ static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr) __futex_atomic_op("mov %0, %3", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ADD: + /* oldval = *uaddr; *uaddr += oparg ; ret = *uaddr */ __futex_atomic_op("add %0, %1, %3", ret, oldval, uaddr, oparg); break; case FUTEX_OP_OR: @@ -142,12 +143,12 @@ static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr) * cmpxchg of futex (pagefaults disabled by caller) */ static inline int -futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, - u32 newval) +futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 expval, + u32 newval) { - u32 val; + u32 existval; - if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) + if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) return -EFAULT; smp_mb(); @@ -173,14 +174,14 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, " .word 1b, 4b \n" " .word 2b, 4b \n" " .previous\n" - : "=&r"(val) - : "r"(oldval), "r"(newval), "r"(uaddr), "ir"(-EFAULT) + : "=&r"(existval) + : "r"(expval), "r"(newval), "r"(uaddr), "ir"(-EFAULT) : "cc", "memory"); smp_mb(); - *uval = val; - return val; + *uval = existval; + return existval; } #endif -- 2.34.1