linux-kernel - Re: [PATCH 05/11] blackfin: fix cmpxchg build fails from system.h fallout

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Date:	Mon, 02 Apr 2012 06:49:15 +0100
From:	David Howells <dhowells@...hat.com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	dhowells@...hat.com, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-next@...r.kernel.org,
	Bob Liu <lliubbo@...il.com>, Mike Frysinger <vapier@...too.org>
Subject: Re: [PATCH 05/11] blackfin: fix cmpxchg build fails from system.h fallout

Paul Gortmaker <paul.gortmaker@...driver.com> wrote:

> Commit 3bed8d67469cc7129b0babc0211c32fa68408ce0
> 
>     "Disintegrate asm/system.h for Blackfin [ver #2]"
> 
> introduced arch/blackfin/include/asm/cmpxchg.h but has it also
> including the asm-generic one which causes this:
> 
>   CC      arch/blackfin/kernel/asm-offsets.s
>   In file included from arch/blackfin/include/asm/cmpxchg.h:125:0,
>                  from arch/blackfin/include/asm/atomic.h:10,
>                  from include/linux/atomic.h:4,
>                  from include/linux/spinlock.h:384,
>                  from include/linux/seqlock.h:29,
>                  from include/linux/time.h:8,
>                  from include/linux/timex.h:56,
>                  from include/linux/sched.h:57,
>                  from arch/blackfin/kernel/asm-offsets.c:10:
>   include/asm-generic/cmpxchg.h:24:15: error: redefinition of '__xchg'
>   arch/blackfin/include/asm/cmpxchg.h:82:29: note: previous definition of '__xchg' was here
>   In file included from arch/blackfin/include/asm/atomic.h:10:0,
>                  from include/linux/atomic.h:4,
>                  from include/linux/spinlock.h:384,
>                  from include/linux/seqlock.h:29,
>                  from include/linux/time.h:8,
>                  from include/linux/timex.h:56,
>                  from include/linux/sched.h:57,
>                  from arch/blackfin/kernel/asm-offsets.c:10:
>   arch/blackfin/include/asm/cmpxchg.h:129:0: warning: "xchg" redefined [enabled by default]
>   include/asm-generic/cmpxchg.h:81:0: note: this is the location of the previous definition
>   make[2]: *** [arch/blackfin/kernel/asm-offsets.s] Error 1
> 
> It really only needs two simple defines from asm-generic, so just
> use those instead.
> 
> Cc: Bob Liu <lliubbo@...il.com>
> Cc: Mike Frysinger <vapier@...too.org>
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>

Acked-by: David Howells <dhowells@...hat.com>
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