linux-kernel - Re: [PATCH] arc: include: asm: add generic cmpxchg64(), cmpxchg64_local(), and cmpxchg

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Date:	Wed, 23 Oct 2013 16:57:08 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	"vgupta@...opsys.com" <vgupta@...opsys.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arc: include: asm: add generic cmpxchg64(), cmpxchg64_local(),
 and cmpxchg_local() in cmpxchg.h

Hello Maintainers:

Please help check this patch whether OK or not, when you have time.

Thanks.

On 09/22/2013 12:40 PM, Chen Gang wrote:
> Some of sub-systems may need cmpxchg64() or another cmpxchg*local()
> functions, need implement them, or can not pass compiling.
> 
> The related error (allmodconfig for arc):
> 
>     CC      drivers/block/blockconsole.o
>   drivers/block/blockconsole.c: In function ‘bcon_advance_console_bytes’:
>   drivers/block/blockconsole.c:164: error: implicit declaration of function ‘cmpxchg64’
> 
> 
> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> ---
>  arch/arc/include/asm/cmpxchg.h |   13 +++++++++++++
>  1 files changed, 13 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arc/include/asm/cmpxchg.h b/arch/arc/include/asm/cmpxchg.h
> index 03cd689..db251f3 100644
> --- a/arch/arc/include/asm/cmpxchg.h
> +++ b/arch/arc/include/asm/cmpxchg.h
> @@ -140,4 +140,17 @@ static inline unsigned long __xchg(unsigned long val, volatile void *ptr,
>   */
>  #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
>  
> +#include <asm-generic/cmpxchg-local.h>
> +
> +/*
> + * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
> + * them available.
> + */
> +#define cmpxchg_local(ptr, o, n)                                               \
> +	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
> +			(unsigned long)(n), sizeof(*(ptr))))
> +#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
> +#define cmpxchg64(ptr, o, n)    cmpxchg64_local((ptr), (o), (n))
> +
> +
>  #endif
> 


-- 
Chen Gang
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