Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[~andy/linux] / include / asm-sparc64 / futex.h

diff --git a/include/asm-sparc64/futex.h b/include/asm-sparc64/futex.h
index 34c4b43d3f9829a80cc4c4386c9097e5167bfd70..7392fc4a954e2d603805c319071bc1cbb89e2d19 100644 (file)
--- a/include/asm-sparc64/futex.h
+++ b/include/asm-sparc64/futex.h
@@ -83,4 +83,26 @@ static inline int 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)
+{
+       __asm__ __volatile__(
+       "\n1:   casa    [%3] %%asi, %2, %0\n"
+       "2:\n"
+       "       .section .fixup,#alloc,#execinstr\n"
+       "       .align  4\n"
+       "3:     ba      2b\n"
+       "        mov    %4, %0\n"
+       "       .previous\n"
+       "       .section __ex_table,\"a\"\n"
+       "       .align  4\n"
+       "       .word   1b, 3b\n"
+       "       .previous\n"
+       : "=r" (newval)
+       : "0" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
+       : "memory");
+
+       return newval;
+}
+
 #endif /* !(_SPARC64_FUTEX_H) */