linux-kernel - Re: [PATCH] atomic: add *_dec_not

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Message-ID: <20110508092403.GB27807@n2100.arm.linux.org.uk>
Date:	Sun, 8 May 2011 10:24:03 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Sven Eckelmann <sven@...fation.org>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mips@...ux-mips.org, linux-m32r@...linux-m32r.org,
	linux-ia64@...r.kernel.org, linux-parisc@...r.kernel.org,
	linux-cris-kernel@...s.com, linux-s390@...r.kernel.org,
	linux-sh@...r.kernel.org, x86@...nel.org,
	Chris Metcalf <cmetcalf@...era.com>,
	David Howells <dhowells@...hat.com>,
	linux-m68k@...ts.linux-m68k.org, linux-am33-list@...hat.com,
	linux-alpha@...r.kernel.org, sparclinux@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	linuxppc-dev@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] atomic: add *_dec_not_zero

On Tue, May 03, 2011 at 11:30:35PM +0200, Sven Eckelmann wrote:
> Introduce an *_dec_not_zero operation.  Make this a special case of
> *_add_unless because batman-adv uses atomic_dec_not_zero in different
> places like re-broadcast queue or aggregation queue management. There
> are other non-final patches which may also want to use this macro.
...
> diff --git a/arch/arm/include/asm/atomic.h b/arch/arm/include/asm/atomic.h
> index 7e79503..a005265 100644
> --- a/arch/arm/include/asm/atomic.h
> +++ b/arch/arm/include/asm/atomic.h
> @@ -218,6 +218,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
>  	return c != u;
>  }
>  #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
> +#define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
>  
>  #define atomic_inc(v)		atomic_add(1, v)
>  #define atomic_dec(v)		atomic_sub(1, v)
> @@ -459,6 +460,7 @@ static inline int atomic64_add_unless(atomic64_t *v, u64 a, u64 u)
>  #define atomic64_dec_return(v)		atomic64_sub_return(1LL, (v))
>  #define atomic64_dec_and_test(v)	(atomic64_dec_return((v)) == 0)
>  #define atomic64_inc_not_zero(v)	atomic64_add_unless((v), 1LL, 0LL)
> +#define atomic64_dec_not_zero(v)	atomic64_add_unless((v), -1LL, 0LL)
>  
>  #else /* !CONFIG_GENERIC_ATOMIC64 */
>  #include <asm-generic/atomic64.h>

Do we need atomic_dec_not_zero() et.al. in every arch header - is there no
generic header which it could be added to?
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