linux-kernel - Re: [PATCH v3] arch: use ASM_NL instead of ';' for assembler new line character in the macro

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Message-ID: <52DA4D09.7030904@gmail.com>
Date:	Sat, 18 Jan 2014 17:44:41 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	Michal Marek <mmarek@...e.cz>
CC:	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v3] arch: use ASM_NL instead of ';' for assembler new
 line character in the macro

Hello Maintainers:

Please help check this patch when you have time.

Thanks.

On 01/12/2014 09:59 AM, Chen Gang wrote:
> For some assemblers, they use another character as newline in a macro
> (e.g. arc uses '`'), so for generic assembly code, need use ASM_NL (a
> macro) instead of ';' for it.
> 
> 
> Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
> Acked-by: Vineet Gupta <vgupta@...opsys.com>
> ---
>  arch/arc/include/asm/linkage.h |  2 ++
>  include/linux/linkage.h        | 19 ++++++++++++-------
>  2 files changed, 14 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/arc/include/asm/linkage.h b/arch/arc/include/asm/linkage.h
> index 0283e9e..66ee552 100644
> --- a/arch/arc/include/asm/linkage.h
> +++ b/arch/arc/include/asm/linkage.h
> @@ -11,6 +11,8 @@
>  
>  #ifdef __ASSEMBLY__
>  
> +#define ASM_NL		 `	/* use '`' to mark new line in macro */
> +
>  /* Can't use the ENTRY macro in linux/linkage.h
>   * gas considers ';' as comment vs. newline
>   */
> diff --git a/include/linux/linkage.h b/include/linux/linkage.h
> index d3e8ad2..a6a42dd 100644
> --- a/include/linux/linkage.h
> +++ b/include/linux/linkage.h
> @@ -6,6 +6,11 @@
>  #include <linux/export.h>
>  #include <asm/linkage.h>
>  
> +/* Some toolchains use other characters (e.g. '`') to mark new line in macro */
> +#ifndef ASM_NL
> +#define ASM_NL		 ;
> +#endif
> +
>  #ifdef __cplusplus
>  #define CPP_ASMLINKAGE extern "C"
>  #else
> @@ -75,21 +80,21 @@
>  
>  #ifndef ENTRY
>  #define ENTRY(name) \
> -  .globl name; \
> -  ALIGN; \
> -  name:
> +	.globl name ASM_NL \
> +	ALIGN ASM_NL \
> +	name:
>  #endif
>  #endif /* LINKER_SCRIPT */
>  
>  #ifndef WEAK
>  #define WEAK(name)	   \
> -	.weak name;	   \
> +	.weak name ASM_NL   \
>  	name:
>  #endif
>  
>  #ifndef END
>  #define END(name) \
> -  .size name, .-name
> +	.size name, .-name
>  #endif
>  
>  /* If symbol 'name' is treated as a subroutine (gets called, and returns)
> @@ -98,8 +103,8 @@
>   */
>  #ifndef ENDPROC
>  #define ENDPROC(name) \
> -  .type name, @function; \
> -  END(name)
> +	.type name, @function ASM_NL \
> +	END(name)
>  #endif
>  
>  #endif
> 


-- 
Chen Gang

Open, share and attitude like air, water and life which God blessed
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