X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=include%2Fasm-i386%2Ffutex.h;h=946d97cfea23841ccbf919fe7cba1df0fb7abe45;hb=ae3e0218621db0590163b2d5c424ef1f340e3cc6;hp=44b9db806474b9faabf19d9b6323b23279b4d0c6;hpb=d344c5e0856ad03278d8700b503762dbc8b86e12;p=linux-2.6-omap-h63xx.git

diff --git a/include/asm-i386/futex.h b/include/asm-i386/futex.h
index 44b9db80647..946d97cfea2 100644
--- a/include/asm-i386/futex.h
+++ b/include/asm-i386/futex.h
@@ -20,8 +20,8 @@
 	.align	8\n\
 	.long	1b,3b\n\
 	.previous"						\
-	: "=r" (oldval), "=r" (ret), "=m" (*uaddr)		\
-	: "i" (-EFAULT), "m" (*uaddr), "0" (oparg), "1" (0))
+	: "=r" (oldval), "=r" (ret), "+m" (*uaddr)		\
+	: "i" (-EFAULT), "0" (oparg), "1" (0))
 
 #define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \
   __asm__ __volatile (						\
@@ -38,9 +38,9 @@
 	.align	8\n\
 	.long	1b,4b,2b,4b\n\
 	.previous"						\
-	: "=&a" (oldval), "=&r" (ret), "=m" (*uaddr),		\
+	: "=&a" (oldval), "=&r" (ret), "+m" (*uaddr),		\
 	  "=&r" (tem)						\
-	: "r" (oparg), "i" (-EFAULT), "m" (*uaddr), "1" (0))
+	: "r" (oparg), "i" (-EFAULT), "1" (0))
 
 static inline int
 futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
@@ -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