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From: Mike Frysinger <vapier.adi@gmail.com>
Date: Wed, 4 May 2011 00:44:46 -0400
Message-ID: <BANLkTiminpyJ_opxhqG0E0gBOrF490b+tQ@mail.gmail.com>
Subject: Re: [PATCH] atomic: add *_dec_not_zero
To: Sven Eckelmann <sven@narfation.org>
Cc: linux-kernel@vger.kernel.org, David Howells <dhowells@redhat.com>,
        Chris Metcalf <cmetcalf@tilera.com>, x86@kernel.org,
        linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        uclinux-dist-devel@blackfin.uclinux.org, linux-cris-kernel@axis.com,
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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@blackfin.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@gentoo.org>
-mike
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