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| author | Jody McIntyre <scjody@modernduck.com> | 2006-03-28 20:24:39 -0500 |
|---|---|---|
| committer | Jody McIntyre <scjody@modernduck.com> | 2006-03-28 20:24:39 -0500 |
| commit | c0e4077c946104e5d8a62f835dcdca5c79c8af7d (patch) | |
| tree | c1f458722f86690a6172bbac2dfef3241ba0ec7e /include/asm-i386/futex.h | |
| parent | 94c2d01a537daf51a9fcf229d7d2204c979355d9 (diff) | |
| parent | ca9ba4471c1203bb6e759b76e83167fec54fe590 (diff) | |
Merge with git+ssh://master.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
Diffstat (limited to 'include/asm-i386/futex.h')
| -rw-r--r-- | include/asm-i386/futex.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/asm-i386/futex.h b/include/asm-i386/futex.h index 44b9db80647..7b8ceefd010 100644 --- a/include/asm-i386/futex.h +++ b/include/asm-i386/futex.h @@ -104,5 +104,32 @@ futex_atomic_op_inuser (int encoded_op, int __user *uaddr) return ret; } +static inline int +futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) +{ + if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) + return -EFAULT; + + __asm__ __volatile__( + "1: " LOCK_PREFIX "cmpxchgl %3, %1 \n" + + "2: .section .fixup, \"ax\" \n" + "3: mov %2, %0 \n" + " jmp 2b \n" + " .previous \n" + + " .section __ex_table, \"a\" \n" + " .align 8 \n" + " .long 1b,3b \n" + " .previous \n" + + : "=a" (oldval), "=m" (*uaddr) + : "i" (-EFAULT), "r" (newval), "0" (oldval) + : "memory" + ); + + return oldval; +} + #endif #endif |