linux-kernel - Re: Portable assmbler code

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Date:	Sun, 27 Oct 2013 21:57:37 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Chen Gang <gang.chen@...anux.com>
CC:	Vineet Gupta <vineetg76@...il.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Richard Weinberger <richard.weinberger@...il.com>,
	Joern Rennecke <joern.rennecke@...ecosm.com>,
	James Hogan <james.hogan@...tec.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Takashi Iwai <tiwai@...e.de>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	"jeremy.bennett@...ecosm.com" <jeremy.bennett@...ecosm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Claudiu Zissulescu <Claudiu.Zissulescu@...opsys.com>,
	Francois Bedard <Francois.Bedard@...opsys.com>,
	Sam Ravnborg <sam@...nborg.org>, Joe Perches <joe@...ches.com>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: Re: Portable assmbler code - newline

On 10/27/2013 08:34 PM, Chen Gang wrote:
> On 10/27/2013 03:28 PM, Vineet Gupta wrote:
>> On 10/26/2013 07:08 PM, Chen Gang wrote:
>>> On 10/25/2013 01:10 PM, Vineet Gupta wrote:
>>>> Eh ! My untested patch was broken but not because of what you mentioned.
>>>>
>>>> For ARC, the ; negating the newline annotation. So the following works (backquote
>>>> is new line for ARC)
>>>>
>>>> diff --git a/arch/arc/include/asm/linkage.h b/arch/arc/include/asm/linkage.h
>>>> index 0283e9e44e0d..b3eea2999322 100644
>>>> --- a/arch/arc/include/asm/linkage.h
>>>> +++ b/arch/arc/include/asm/linkage.h
>>>> @@ -9,6 +9,8 @@
>>>>  #ifndef __ASM_LINKAGE_H
>>>>  #define __ASM_LINKAGE_H
>>>>
>>>> +#define __ARCH_NL      `
>>>> +
>>>>  #ifdef __ASSEMBLY__
>>>>
>>>>
>>>> diff --git a/include/linux/linkage.h b/include/linux/linkage.h
>>>> index d3e8ad23a8e0..969e70ad231a 100644
>>>> --- a/include/linux/linkage.h
>>>> +++ b/include/linux/linkage.h
>>>> @@ -6,6 +6,10 @@
>>>>  #include <linux/export.h>
>>>>  #include <asm/linkage.h>
>>>>
>>>> +#ifndef __ARCH_NL
>>>> +#define __ARCH_NL      ;
>>>> +#endif
>>>> +
>>>>  #ifdef __cplusplus
>>>>  #define CPP_ASMLINKAGE extern "C"
>>>>  #else
>>>> @@ -75,7 +79,7 @@
>>>>
>>>>  #ifndef ENTRY
>>>>  #define ENTRY(name) \
>>>> -  .globl name; \
>>>> +  .globl name __ARCH_NL \
>>>>    ALIGN; \
>>>
>>> Do we also need consider about "ALIGN;"?
>>
>> Right - as I said already, above was not a formal patch but a RFC whether we are
>> on right track. The proper fix will have to audit all such places.
>>
>>
>>>>    name:
>>>>  #endif
>>>>
>>>
>>> For next-20130927 tree, do we also need consider about WEAK, ENDPROC?
>>
>> Indeed.
>>
>>
>>> I am not quite sure about it, but I will try. 
>>
>> So you volunteer to send out a patch base don __ARCH_NL I proposed above ?
>>
>>
> 
> OK, I will/should try.
> 
> Hmm... I am 'almost' a volunteer: my company support what I have done
> for Public Open Source, they treat it as important thing.
> 
> Now you are mainly focusing on arc, and I want/try to focus on kernel
> wide. This patch belongs to kernel wide, and at least now, nobody
> rejects me for it, so I will/should try.
> 
> 
>>> Now, I am just analyzing
>>> another issue -- maybe the last issue for allmodconfig under arc, which
>>> may be related with this patch, the errors are:
>>>
>>>       1   Building modules, stage 2.
>>>       2   MODPOST 2994 modules
>>>       3 ERROR: "__st_r13_to_r20" [sound/usb/snd-usbmidi-lib.ko] undefined!
>>
>> Yes we know about this already. This is to do with libgcc linkage. The fix is non
>> trivial - I'll get back to you on this. For now disable CONFIG_CC_OPTIMIZE_FOR_SIZE.
>>
> 
> OK, thank you for your valuable information in time, at least, it saves
> my time resources, after pass this issue, hope our arc can pass
> allmodconfig.
> 
> :-)
> 


In "include/asm-generic/vmlinux.lds.h", I guess "*(...)" also can
express an individual line, is it generic enough to arc, too?


Thanks.

>> -Vineet
>> --
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>>
> 
> Thanks.
> 


-- 
Chen Gang
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