From 90ecc248e200fee448001248dde0ca540dd3ef64 Mon Sep 17 00:00:00 2001
From: Ralf Baechle <ralf@linux-mips.org>
Date: Thu, 1 Dec 1994 08:00:00 +0000
Subject: Import of Linux/MIPS 1.1.68

---
 kernel/dma.c | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'kernel/dma.c')

diff --git a/kernel/dma.c b/kernel/dma.c
index ce80c2fa6..799439ed6 100644
--- a/kernel/dma.c
+++ b/kernel/dma.c
@@ -5,6 +5,7 @@
 
 #include <linux/kernel.h>
 #include <linux/errno.h>
+#include <asm/system.h>
 #include <asm/dma.h>
 
 
@@ -62,10 +63,18 @@ static __inline__ unsigned int mutex_atomic_swap(volatile unsigned int * p, unsi
 	 * the swap may not be atomic.
 	 */
 
+#if 0
 	asm __volatile__ ("xchgl %2, %0\n"
 			: /* outputs: semval   */ "=r" (semval)
 			: /* inputs: newval, p */ "0" (semval), "m" (*p)
 			);	/* p is a var, containing an address */
+#else
+	/*
+	 * RB: Try atomic exchange from include/asm/system.h
+	 * This should be portable...
+	 */
+	atomic_exchange(p,semval)
+#endif
 	return semval;
 } /* mutex_atomic_swap */
 
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