MN10300: Implement atomic ops using atomic ops unit
Implement atomic ops using the atomic ops unit available in the AM34 CPU. This
allows the equivalent of the LL/SC instructions to be found on other CPUs.
Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/arch/mn10300/include/asm/system.h b/arch/mn10300/include/asm/system.h
index 3c272a1..7de90bc 100644
--- a/arch/mn10300/include/asm/system.h
+++ b/arch/mn10300/include/asm/system.h
@@ -18,6 +18,7 @@
#include <linux/kernel.h>
#include <linux/irqflags.h>
+#include <asm/atomic.h>
#if !defined(CONFIG_LAZY_SAVE_FPU)
struct fpu_state_struct;
@@ -96,52 +97,5 @@
#define read_barrier_depends() do {} while (0)
#define smp_read_barrier_depends() do {} while (0)
-/*****************************************************************************/
-/*
- * MN10300 doesn't actually have an exchange instruction
- */
-#ifndef __ASSEMBLY__
-
-struct __xchg_dummy { unsigned long a[100]; };
-#define __xg(x) ((struct __xchg_dummy *)(x))
-
-static inline
-unsigned long __xchg(volatile unsigned long *m, unsigned long val)
-{
- unsigned long retval;
- unsigned long flags;
-
- local_irq_save(flags);
- retval = *m;
- *m = val;
- local_irq_restore(flags);
- return retval;
-}
-
-#define xchg(ptr, v) \
- ((__typeof__(*(ptr))) __xchg((unsigned long *)(ptr), \
- (unsigned long)(v)))
-
-static inline unsigned long __cmpxchg(volatile unsigned long *m,
- unsigned long old, unsigned long new)
-{
- unsigned long retval;
- unsigned long flags;
-
- local_irq_save(flags);
- retval = *m;
- if (retval == old)
- *m = new;
- local_irq_restore(flags);
- return retval;
-}
-
-#define cmpxchg(ptr, o, n) \
- ((__typeof__(*(ptr))) __cmpxchg((unsigned long *)(ptr), \
- (unsigned long)(o), \
- (unsigned long)(n)))
-
-#endif /* !__ASSEMBLY__ */
-
#endif /* __KERNEL__ */
#endif /* _ASM_SYSTEM_H */