linux-kernel - Re: [PATCH] atomic64_test: Simplify the #ifdef for atomic64_dec_if

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Date:	Wed, 18 Jul 2012 15:10:37 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, linux390@...ibm.com,
	x86@...nel.org
Subject: Re: [PATCH] atomic64_test: Simplify the #ifdef for
 atomic64_dec_if_positive() test

On Tue, 17 Jul 2012 18:10:48 +0100
Catalin Marinas <catalin.marinas@....com> wrote:

> This patch introduces CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE and uses
> this instead of the multitude of #if defined() checks in atomic64_test.c
> 
> ...
>
> --- a/lib/atomic64_test.c
> +++ b/lib/atomic64_test.c
> @@ -114,8 +114,7 @@ static __init int test_atomic64(void)
>  	r += one;
>  	BUG_ON(v.counter != r);
>  
> -#if defined(CONFIG_X86) || defined(CONFIG_MIPS) || defined(CONFIG_PPC) || \
> -    defined(CONFIG_S390) || defined(_ASM_GENERIC_ATOMIC64_H) || defined(CONFIG_ARM)

ugh, good riddance.

> +#ifdef CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE

The alternative way of doing this is to do

#define atomic64_dec_if_positive atomic64_dec_if_positive

in all the relevant .h files, then use #ifdef atomic64_dec_if_positive.
That's rather nice because it keeps everything in one place.  otoh it
is rather unobvious trickery.

But either way is better than what we have now.
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