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Message-ID: <20100430162216.GA32570@Krystal>
Date: Fri, 30 Apr 2010 12:22:16 -0400
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: David Howells <dhowells@...hat.com>
Cc: Peter Fritzsche <peter.fritzsche@....de>,
Jamie Lokier <jamie@...reable.org>,
Arnd Bergmann <arnd@...db.de>, Ingo Molnar <mingo@...e.hu>,
Andrew Morton <akpm@...ux-foundation.org>,
Heiko Carstens <heiko.carstens@...ibm.com>,
linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
Keith M Wesolowski <wesolows@...bazco.org>,
Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: 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@...icios.com>
Acked-by: David Howells <dhowells@...hat.com>
Acked-by: Peter Fritzsche <peter.fritzsche@....de>
CC: Jamie Lokier <jamie@...reable.org>
CC: Arnd Bergmann <arnd@...db.de>
CC: Ingo Molnar <mingo@...e.hu>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: Heiko Carstens <heiko.carstens@...ibm.com>
CC: Keith M Wesolowski <wesolows@...bazco.org>
CC: Martin Schwidefsky <schwidefsky@...ibm.com>
---
arch/mn10300/include/asm/atomic.h | 158 --------------------------------------
1 file changed, 1 insertion(+), 157 deletions(-)
Index: linux.trees.git/arch/mn10300/include/asm/atomic.h
===================================================================
--- linux.trees.git.orig/arch/mn10300/include/asm/atomic.h 2010-04-30 12:16:39.000000000 -0400
+++ linux.trees.git/arch/mn10300/include/asm/atomic.h 2010-04-30 12:16:54.000000000 -0400
@@ -1,157 +1 @@
-/* MN10300 Atomic counter operations
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@...hat.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) ((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>
--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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