X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=include%2Fasm-sparc64%2Ffutex.h;h=dee40206b221f8d30d1e011faf79eedbea81402c;hb=8ac773b4f73afa6fd66695131103944b975d5d5c;hp=34c4b43d3f9829a80cc4c4386c9097e5167bfd70;hpb=536ea4e4198eeaa5a73fb734ea675e621609bb7e;p=powerpc.git

diff --git a/include/asm-sparc64/futex.h b/include/asm-sparc64/futex.h
index 34c4b43d3f..dee40206b2 100644
--- a/include/asm-sparc64/futex.h
+++ b/include/asm-sparc64/futex.h
@@ -83,4 +83,28 @@ 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:	lduwa	[%2] %%asi, %0\n"
+	"2:	casa	[%2] %%asi, %0, %1\n"
+	"3:\n"
+	"	.section .fixup,#alloc,#execinstr\n"
+	"	.align	4\n"
+	"4:	ba	3b\n"
+	"	 mov	%3, %0\n"
+	"	.previous\n"
+	"	.section __ex_table,\"a\"\n"
+	"	.align	4\n"
+	"	.word	1b, 4b\n"
+	"	.word	2b, 4b\n"
+	"	.previous\n"
+	: "=&r" (oldval)
+	: "r" (newval), "r" (uaddr), "i" (-EFAULT)
+	: "memory");
+
+	return oldval;
+}
+
 #endif /* !(_SPARC64_FUTEX_H) */