linux-kernel - Re: [PATCH v2] arch: use ASM_NL instead of ';' for assembler new line character in the macro

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Date:	Fri, 1 Nov 2013 11:15:16 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Chen Gang <gang.chen@...anux.com>
CC:	James Hogan <james.hogan@...tec.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	"Max Filippov" <jcmvbkbc@...il.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Tim Abbott <tabbott@...lice.com>,
	Joe Perches <joe@...ches.com>, Michal Marek <mmarek@...e.cz>,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH v2] arch: use ASM_NL instead of ';' for assembler new
 line character in the macro

+CC Sam, Tim, Joe, Michal, David

Guys can you please take a look at this patch and suggest the best way to merge.

The root cause is some gas ports (including ARC) use ';' for comment (vs. newline)
More background at https://lkml.org/lkml/2013/10/24/365


On 10/29/2013 07:21 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.
> 
> Also need notice about code styles ('\t' for each line).
> 
> 
> Signed-off-by: Chen Gang <gang.chen@...anux.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
> 

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