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

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Date:	Wed, 4 May 2011 00:44:46 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Sven Eckelmann <sven@...fation.org>
Cc:	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>,
	Chris Metcalf <cmetcalf@...era.com>, x86@...nel.org,
	linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	linux-cris-kernel@...s.com, linux-ia64@...r.kernel.org,
	linux-m32r@...linux-m32r.org, linux-m68k@...ts.linux-m68k.org,
	linux-mips@...ux-mips.org, linux-am33-list@...hat.com,
	linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
	sparclinux@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH] atomic: add *_dec_not_zero

On Tue, May 3, 2011 at 17:30, 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.
>
> Cc: uclinux-dist-devel@...ckfin.uclinux.org
>
> --- a/arch/blackfin/include/asm/atomic.h
> +++ b/arch/blackfin/include/asm/atomic.h
> @@ -103,6 +103,7 @@ static inline int atomic_test_mask(int mask, atomic_t *v)
>        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)
>
>  /*
>  * atomic_inc_and_test - increment and test

no opinion on the actual idea, but for the Blackfin pieces:
Acked-by: Mike Frysinger <vapier@...too.org>
-mike
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