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

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Message-ID: <BANLkTinWa9E1_iLWyqAF+G8Qag=YK2T98A@mail.gmail.com>
Date:	Wed, 4 May 2011 14:13:29 -0400
From:	Matt Turner <mattst88@...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 5:30 PM, Sven Eckelmann <sven@...fation.org> wrote:
> diff --git a/arch/alpha/include/asm/atomic.h b/arch/alpha/include/asm/atomic.h
> index e756d04..7e9434e 100644
> --- a/arch/alpha/include/asm/atomic.h
> +++ b/arch/alpha/include/asm/atomic.h
> @@ -200,6 +200,7 @@ 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)
>
>  /**
>  * atomic64_add_unless - add unless the number is a given value
> @@ -226,6 +227,7 @@ 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)
>
>  #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
>  #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
> diff --git a/arch/alpha/include/asm/local.h b/arch/alpha/include/asm/local.h
> index b9e3e33..09fb327 100644
> --- a/arch/alpha/include/asm/local.h
> +++ b/arch/alpha/include/asm/local.h
> @@ -79,6 +79,7 @@ static __inline__ long local_sub_return(long i, local_t * l)
>        c != (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_add_negative(a, l) (local_add_return((a), (l)) < 0)
>

Acked-by: Matt Turner <mattst88@...il.com> [alpha]
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