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

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Date:	Mon, 09 May 2011 08:15:39 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
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@...r.kernel.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, 2011-05-03 at 23:30 +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.

For arch/powerpc:

Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>

(Sorry for catching up late)

Cheers,
Ben.

> diff --git a/arch/powerpc/include/asm/atomic.h b/arch/powerpc/include/asm/atomic.h
> index b8f152e..906f49a 100644
> --- a/arch/powerpc/include/asm/atomic.h
> +++ b/arch/powerpc/include/asm/atomic.h
> @@ -213,6 +213,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int 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_sub_and_test(a, v)	(atomic_sub_return((a), (v)) == 0)
>  #define atomic_dec_and_test(v)		(atomic_dec_return((v)) == 0)
> @@ -469,6 +470,7 @@ static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
>  }
>  
>  #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
> +#define atomic64_dec_not_zero(v) atomic64_add_unless((v), -1, 0)
>  
>  #else  /* __powerpc64__ */
>  #include <asm-generic/atomic64.h>
> diff --git a/arch/powerpc/include/asm/local.h b/arch/powerpc/include/asm/local.h
> index c2410af..3d4c58a 100644
> --- a/arch/powerpc/include/asm/local.h
> +++ b/arch/powerpc/include/asm/local.h
> @@ -134,6 +134,7 @@ static __inline__ int local_add_unless(local_t *l, long a, long u)
>  }
>  
>  #define local_inc_not_zero(l) local_add_unless((l), 1, 0)
> +#define local_dec_not_zero(l) local_add_unless((l), -1, 0)
>  
>  #define local_sub_and_test(a, l)	(local_sub_return((a), (l)) == 0)
>  #define local_dec_and_test(l)		(local_dec_return((l)) == 0)



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