mn10300: use generic atomic.h

asm-generic/atomic.h has been derived from the mn10300 implementation.
Remove the now duplicated mn10300 implementation by including the generic
version instead.

This adds cmpxchg_local() and cmpxchg64_local() for free to the
architecture, as they are implemented in asm-generic/atomic.h.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: David Howells <dhowells@redhat.com>
Acked-by: Peter Fritzsche <peter.fritzsche@gmx.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Jamie Lokier <jamie@shareable.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Keith M Wesolowski <wesolows@foobazco.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/mn10300/include/asm/atomic.h b/arch/mn10300/include/asm/atomic.h
index e41222d6c2fd1a5d3a97a20482c09ff10b652eba..f0cc1f84a72f180c5492987327b855b36bf46561 100644 (file)
--- a/arch/mn10300/include/asm/atomic.h
+++ b/arch/mn10300/include/asm/atomic.h
@@ -1,157 +1 @@
-/* MN10300 Atomic counter operations
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
-#ifndef _ASM_ATOMIC_H
-#define _ASM_ATOMIC_H
-
-#ifdef CONFIG_SMP
-#error not SMP safe
-#endif
-
-/*
- * Atomic operations that C can't guarantee us.  Useful for
- * resource counting etc..
- */
-
-#define ATOMIC_INIT(i) { (i) }
-
-#ifdef __KERNEL__
-
-/**
- * atomic_read - read atomic variable
- * @v: pointer of type atomic_t
- *
- * Atomically reads the value of @v.  Note that the guaranteed
- * useful range of an atomic_t is only 24 bits.
- */
-#define atomic_read(v) (*(volatile int *)&(v)->counter)
-
-/**
- * atomic_set - set atomic variable
- * @v: pointer of type atomic_t
- * @i: required value
- *
- * Atomically sets the value of @v to @i.  Note that the guaranteed
- * useful range of an atomic_t is only 24 bits.
- */
-#define atomic_set(v, i) (((v)->counter) = (i))
-
-#include <asm/system.h>
-
-/**
- * atomic_add_return - add integer to atomic variable
- * @i: integer value to add
- * @v: pointer of type atomic_t
- *
- * Atomically adds @i to @v and returns the result
- * Note that the guaranteed useful range of an atomic_t is only 24 bits.
- */
-static inline int atomic_add_return(int i, atomic_t *v)
-{
-       unsigned long flags;
-       int temp;
-
-       local_irq_save(flags);
-       temp = v->counter;
-       temp += i;
-       v->counter = temp;
-       local_irq_restore(flags);
-
-       return temp;
-}
-
-/**
- * atomic_sub_return - subtract integer from atomic variable
- * @i: integer value to subtract
- * @v: pointer of type atomic_t
- *
- * Atomically subtracts @i from @v and returns the result
- * Note that the guaranteed useful range of an atomic_t is only 24 bits.
- */
-static inline int atomic_sub_return(int i, atomic_t *v)
-{
-       unsigned long flags;
-       int temp;
-
-       local_irq_save(flags);
-       temp = v->counter;
-       temp -= i;
-       v->counter = temp;
-       local_irq_restore(flags);
-
-       return temp;
-}
-
-static inline int atomic_add_negative(int i, atomic_t *v)
-{
-       return atomic_add_return(i, v) < 0;
-}
-
-static inline void atomic_add(int i, atomic_t *v)
-{
-       atomic_add_return(i, v);
-}
-
-static inline void atomic_sub(int i, atomic_t *v)
-{
-       atomic_sub_return(i, v);
-}
-
-static inline void atomic_inc(atomic_t *v)
-{
-       atomic_add_return(1, v);
-}
-
-static inline void atomic_dec(atomic_t *v)
-{
-       atomic_sub_return(1, v);
-}
-
-#define atomic_dec_return(v)           atomic_sub_return(1, (v))
-#define atomic_inc_return(v)           atomic_add_return(1, (v))
-
-#define atomic_sub_and_test(i, v)      (atomic_sub_return((i), (v)) == 0)
-#define atomic_dec_and_test(v)         (atomic_sub_return(1, (v)) == 0)
-#define atomic_inc_and_test(v)         (atomic_add_return(1, (v)) == 0)
-
-#define atomic_add_unless(v, a, u)                             \
-({                                                             \
-       int c, old;                                             \
-       c = atomic_read(v);                                     \
-       while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
-               c = old;                                        \
-       c != (u);                                               \
-})
-
-#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
-
-static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
-{
-       unsigned long flags;
-
-       mask = ~mask;
-       local_irq_save(flags);
-       *addr &= mask;
-       local_irq_restore(flags);
-}
-
-#define atomic_xchg(ptr, v)            (xchg(&(ptr)->counter, (v)))
-#define atomic_cmpxchg(v, old, new)    (cmpxchg(&((v)->counter), (old), (new)))
-
-/* Atomic operations are already serializing on MN10300??? */
-#define smp_mb__before_atomic_dec()    barrier()
-#define smp_mb__after_atomic_dec()     barrier()
-#define smp_mb__before_atomic_inc()    barrier()
-#define smp_mb__after_atomic_inc()     barrier()
-
-#include <asm-generic/atomic-long.h>
-
-#endif /* __KERNEL__ */
-#endif /* _ASM_ATOMIC_H */
+#include <asm-generic/atomic.h>