Commit-ID: 0ee3b6f87d4d748d5362cb47ff33fa1553805cb4 Gitweb: http://git.kernel.org/tip/0ee3b6f87d4d748d5362cb47ff33fa1553805cb4 Author: Qiaowei Ren <[email protected]> AuthorDate: Sat, 14 Dec 2013 14:25:03 +0800 Committer: H. Peter Anvin <[email protected]> CommitDate: Mon, 16 Dec 2013 09:08:13 -0800
x86: replace futex_atomic_cmpxchg_inatomic() with user_atomic_cmpxchg_inatomic futex_atomic_cmpxchg_inatomic() is simply the 32-bit implementation of user_atomic_cmpxchg_inatomic(), which in turn is simply a generalization of the original code in futex_atomic_cmpxchg_inatomic(). Use the newly generalized user_atomic_cmpxchg_inatomic() as the futex implementation, too. [ hpa: retain the inline in futex.h rather than changing it to a macro ] Signed-off-by: Qiaowei Ren <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: H. Peter Anvin <[email protected]> Cc: Peter Zijlstra <[email protected]> --- arch/x86/include/asm/futex.h | 21 +-------------------- 1 file changed, 1 insertion(+), 20 deletions(-) diff --git a/arch/x86/include/asm/futex.h b/arch/x86/include/asm/futex.h index be27ba1..b4c1f54 100644 --- a/arch/x86/include/asm/futex.h +++ b/arch/x86/include/asm/futex.h @@ -110,26 +110,7 @@ static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr) static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, u32 newval) { - int ret = 0; - - if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) - return -EFAULT; - - asm volatile("\t" ASM_STAC "\n" - "1:\t" LOCK_PREFIX "cmpxchgl %4, %2\n" - "2:\t" ASM_CLAC "\n" - "\t.section .fixup, \"ax\"\n" - "3:\tmov %3, %0\n" - "\tjmp 2b\n" - "\t.previous\n" - _ASM_EXTABLE(1b, 3b) - : "+r" (ret), "=a" (oldval), "+m" (*uaddr) - : "i" (-EFAULT), "r" (newval), "1" (oldval) - : "memory" - ); - - *uval = oldval; - return ret; + return user_atomic_cmpxchg_inatomic(uval, uaddr, oldval, newval); } #endif -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
