linux-kernel - Re: [PATCH] asm-generic: fix local_add

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Message-ID: <20090123154520.GB7774@Krystal>
Date:	Fri, 23 Jan 2009 10:45:20 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Roel Kluin <roel.kluin@...il.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] asm-generic: fix local_add_unless macro

* Roel Kluin (roel.kluin@...il.com) wrote:
> When this macro isn't called with 'a' this will 
> result in a build failure.
> 

Maybe we can add to the changelog, for prople like me who fail to see
the obvious :

"because local_add_unless(x, y, z) will be expanded to 
(&(x)->y, (y), (x)), where (x)->y should be (x)->a.

Thanks,

Acked-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>

> Signed-off-by: Roel Kluin <roel.kluin@...il.com>
> ---
> diff --git a/include/asm-generic/local.h b/include/asm-generic/local.h
> index dbd6150..fc21844 100644
> --- a/include/asm-generic/local.h
> +++ b/include/asm-generic/local.h
> @@ -42,7 +42,7 @@ typedef struct
>  
>  #define local_cmpxchg(l, o, n) atomic_long_cmpxchg((&(l)->a), (o), (n))
>  #define local_xchg(l, n) atomic_long_xchg((&(l)->a), (n))
> -#define local_add_unless(l, a, u) atomic_long_add_unless((&(l)->a), (a), (u))
> +#define local_add_unless(l, _a, u) atomic_long_add_unless((&(l)->a), (_a), (u))
>  #define local_inc_not_zero(l) atomic_long_inc_not_zero(&(l)->a)
>  
>  /* Non-atomic variants, ie. preemption disabled and won't be touched

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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