linux-kernel - Re: [PATCH 6/6] Blackfin: SMP: convert to common asm-generic/atomic.h

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Date:	Tue, 21 Jun 2011 16:05:28 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mike Frysinger <vapier@...too.org>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	Arun Sharma <asharma@...com>,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [PATCH 6/6] Blackfin: SMP: convert to common
 asm-generic/atomic.h

On Fri, 17 Jun 2011 17:53:34 -0400
Mike Frysinger <vapier@...too.org> wrote:

> Now that common code supports SMP systems, switch our SMP atomic logic
> over to it to avoid code duplication.

There were some rejects on this one, I think because lines 2, 3 and 4
had non-ascii crap in them and because your patch was expecting
inclusions of asm-generic/atomic-long.h and asm-generic/atomic64.h,
which were removed.

I ended up with the below but I don't know if it works.

/*
 * Copyright 2004-2011 Analog Devices Inc.
_*
_* Licensed under the GPL-2 or later.
_*/

#ifndef __ARCH_BLACKFIN_ATOMIC__
#define __ARCH_BLACKFIN_ATOMIC__

#ifdef CONFIG_SMP

#include <linux/linkage.h>

asmlinkage int __raw_uncached_fetch_asm(const volatile int *ptr);
asmlinkage int __raw_atomic_update_asm(volatile int *ptr, int value);
asmlinkage int __raw_atomic_clear_asm(volatile int *ptr, int value);
asmlinkage int __raw_atomic_set_asm(volatile int *ptr, int value);
asmlinkage int __raw_atomic_xor_asm(volatile int *ptr, int value);
asmlinkage int __raw_atomic_test_asm(const volatile int *ptr, int value);

#define atomic_read(v) __raw_uncached_fetch_asm(&(v)->counter)

#define atomic_add_return(i, v) __raw_atomic_update_asm(&(v)->counter, i)
#define atomic_sub_return(i, v) __raw_atomic_update_asm(&(v)->counter, -(i))
#define atomic_clear_mask(m, v) __raw_atomic_clear_asm(&(v)->counter, m)
#define atomic_set_mask(m, v)   __raw_atomic_set_asm(&(v)->counter, m)

#endif

#include <asm-generic/atomic.h>

#endif
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