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List:       linux-kernel
Subject:    [patch 19/28] Add cmpxchg_local to m68knommu
From:       Mathieu Desnoyers <mathieu.desnoyers () polymtl ! ca>
Date:       2007-10-31 22:37:29
Message-ID: 20071031224216.488906618 () polymtl ! ca
[Download RAW message or body]

Use the new generic cmpxchg_local (disables interrupt). Also use the generic
cmpxchg as fallback if SMP is not set.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: clameter@sgi.com
CC: gerg@uclinux.org
---
 include/asm-m68knommu/system.h |   28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)

Index: linux-2.6-lttng/include/asm-m68knommu/system.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-m68knommu/system.h	2007-10-31 17:32:43.000000000 -0400
+++ linux-2.6-lttng/include/asm-m68knommu/system.h	2007-10-31 18:17:59.000000000 -0400
@@ -187,26 +187,20 @@ static inline unsigned long __xchg(unsig
 }
 #endif
 
+#include <asm-generic/cmpxchg-local.h>
+
 /*
- * Atomic compare and exchange.  Compare OLD with MEM, if identical,
- * store NEW in MEM.  Return the initial value in MEM.  Success is
- * indicated by comparing RETURN with OLD.
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
  */
-#define __HAVE_ARCH_CMPXCHG	1
-
-static __inline__ unsigned long
-cmpxchg(volatile int *p, int old, int new)
-{
-	unsigned long flags;
-	int prev;
-
-	local_irq_save(flags);
-	if ((prev = *p) == old)
-		*p = new;
-	local_irq_restore(flags);
-	return(prev);
-}
+#define cmpxchg_local(ptr, o, n)				  	       \
+	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
+			(unsigned long)(n), sizeof(*(ptr))))
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
 
+#ifndef CONFIG_SMP
+#include <asm-generic/cmpxchg.h>
+#endif
 
 #ifdef CONFIG_M68332
 #define HARD_RESET_NOW() ({		\

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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