From: Chen Gang <gang.chen@asianux.com>
To: Vineet Gupta <vineetg76@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
Richard Weinberger <richard.weinberger@gmail.com>,
Joern Rennecke <joern.rennecke@embecosm.com>,
James Hogan <james.hogan@imgtec.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Takashi Iwai <tiwai@suse.de>,
Vineet Gupta <Vineet.Gupta1@synopsys.com>,
"jeremy.bennett@embecosm.com" <jeremy.bennett@embecosm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Claudiu Zissulescu <Claudiu.Zissulescu@synopsys.com>,
Francois Bedard <Francois.Bedard@synopsys.com>,
Sam Ravnborg <sam@ravnborg.org>, Joe Perches <joe@perches.com>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>
Subject: Re: Portable assmbler code - newline (was Re: [PATCH] kernel/modsign_certificate.S: use real contents instead of macro GLOBAL())
Date: Sat, 26 Oct 2013 21:38:28 +0800 [thread overview]
Message-ID: <526BC5D4.9070809@asianux.com> (raw)
In-Reply-To: <5269FD53.6040903@synopsys.com>
On 10/25/2013 01:10 PM, Vineet Gupta wrote:
> On 10/25/2013 01:11 AM, Geert Uytterhoeven wrote:
>> On Thu, Oct 24, 2013 at 7:28 PM, Vineet Gupta <vineetg76@gmail.com> wrote:
>>>> +CC linux-arch
>>>>
>>>> On 10/24/2013 11:33 AM, Richard Weinberger wrote:
>>>>>> On Thu, Oct 24, 2013 at 7:31 AM, Chen Gang <gang.chen@asianux.com> wrote:
>>>>>>>>>> For some architectures, tool chain is not smart enough to recognize the
>>>>>>>>>> macro with multiple lines (e.g. arc tool chain), and for common ".S"
>>>>>>>>>> file, this kind of macro is also rarely used.
>>>>>> Does not "not smart enough" mean than the said toolchain is broken/buggy
>>>>>> or is the kernel using an unsupported notation?
>>>>>>
>>>>
>>>> IMHO this is not broken - rather the code is not fully portable - given that gas
>>>> ports of arches have differnet notions of what to treat as comment and what newline.
>>>>
>>>> Looking as binutils/gas/config, I can see that avr, cris,...are likely broken in
>>>> the same way as ARC is.
>>>>
>>>> Historically ARC has had ';' as comment char, which Joern relatively recently
>>>> augmented to have '#' as well. However there's legacy codebase which relies on ';'
>>>> being a comment and we can't change that fact.
>>>>
>>>> So can we introduce an ARCH over-ridable newline annotation in linkage.h and other
>>>> places after auditing. Since asm/linkage.h preempts linux/linkage.h by way of
>>>> #include it shd be pretty strightforward.
>>>>
>>>> Something like below. I can send the formal patch if people think the approach is OK.
>> By what are you gonna override __ARCH_NL on ARC?
>> I'm afraid cpp will still turn it into a single line.
>>
>
> 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;"?
> name:
> #endif
>
For next-20130927 tree, do we also need consider about WEAK, ENDPROC?
I am not quite sure about it, but I will 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!
4 ERROR: "__ld_r13_to_r15" [sound/usb/snd-usbmidi-lib.ko] undefined!
5 ERROR: "__st_r13_to_r18" [sound/usb/snd-usbmidi-lib.ko] undefined!
6 ERROR: "__ld_r13_to_r14_ret" [sound/usb/snd-usbmidi-lib.ko] undefined!
7 ERROR: "__ld_r13_to_r22" [sound/usb/snd-usbmidi-lib.ko] undefined!
8 ERROR: "__ld_r13_to_r15_ret" [sound/usb/snd-usbmidi-lib.ko] undefined!
9 ERROR: "__ld_r13_to_r16" [sound/usb/snd-usbmidi-lib.ko] undefined!
10 ERROR: "__ld_r13_to_r18_ret" [sound/usb/snd-usbmidi-lib.ko] undefined!
11 ERROR: "__ld_r13_to_r24_ret" [sound/usb/snd-usbmidi-lib.ko] undefined!
...
...
28095 ERROR: "__st_r13_to_r17" [arch/arc/oprofile/oprofile.ko] undefined!
28096 ERROR: "__st_r13_to_r22" [arch/arc/oprofile/oprofile.ko] undefined!
28097 ERROR: "__ld_r13_to_r19_ret" [Documentation/filesystems/configfs/configfs_example_macros.ko] undefined!
28098 ERROR: "__st_r13_to_r19" [Documentation/filesystems/configfs/configfs_example_macros.ko] undefined!
28099 ERROR: "__ld_r13_to_r14_ret" [Documentation/filesystems/configfs/configfs_example_macros.ko] undefined!
28100 ERROR: "__ld_r13_to_r19_ret" [Documentation/filesystems/configfs/configfs_example_explicit.ko] undefined!
28101 ERROR: "__st_r13_to_r19" [Documentation/filesystems/configfs/configfs_example_explicit.ko] undefined!
28102 ERROR: "__ld_r13_to_r14_ret" [Documentation/filesystems/configfs/configfs_example_explicit.ko] undefined!
28103 ERROR: "__ld_r13_to_r14_ret" [Documentation/connector/cn_test.ko] undefined!
28104 make[1]: *** [__modpost] Error 1
28105 make: *** [modules] Error 2
Thanks.
--
Chen Gang
next prev parent reply other threads:[~2013-10-26 13:39 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-23 6:04 [Suggestion] arc: compiler: bug: about an arc compiler's bug which is not in gcc main source code Chen Gang
2013-09-23 6:12 ` Chen Gang
2013-09-23 6:39 ` Vineet Gupta
2013-09-23 6:53 ` Chen Gang
2013-10-23 2:00 ` Chen Gang
2013-10-23 2:48 ` Joern Rennecke
2013-10-23 3:10 ` Chen Gang
2013-10-23 11:14 ` Chen Gang
2013-10-24 5:31 ` [PATCH] kernel/modsign_certificate.S: use real contents instead of macro GLOBAL() Chen Gang
2013-10-24 6:03 ` Richard Weinberger
2013-10-24 6:26 ` Chen Gang
2013-10-24 6:44 ` Richard Weinberger
2013-10-24 7:40 ` Chen Gang
2013-10-24 17:28 ` Portable assmbler code - newline (was Re: [PATCH] kernel/modsign_certificate.S: use real contents instead of macro GLOBAL()) Vineet Gupta
2013-10-24 19:41 ` Geert Uytterhoeven
2013-10-25 5:10 ` Vineet Gupta
2013-10-26 13:38 ` Chen Gang [this message]
2013-10-27 7:28 ` Portable assmbler code - newline Vineet Gupta
2013-10-27 12:34 ` Chen Gang
2013-10-27 13:57 ` Chen Gang
2013-10-24 15:29 ` [PATCH] kernel/modsign_certificate.S: use real contents instead of macro GLOBAL() Josh Boyer
2013-10-26 2:42 ` Chen Gang
2013-10-26 14:40 ` Chen Gang F T
2013-10-29 2:17 ` [PATCH v2] " Chen Gang
2013-10-30 1:11 ` [PATCH-next v3] kernel/system_certificate.S: " Chen Gang
2013-10-30 12:57 ` David Howells
2013-10-31 0:47 ` Chen Gang
2013-10-23 2:51 ` [Suggestion] arc: compiler: bug: about an arc compiler's bug which is not in gcc main source code Francois Bedard
2013-10-23 3:12 ` Chen Gang
2013-10-30 1:43 ` Chen Gang
2013-10-30 12:10 ` Chen Gang
2013-10-31 7:48 ` Vineet Gupta
2013-10-31 8:50 ` Chen Gang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=526BC5D4.9070809@asianux.com \
--to=gang.chen@asianux.com \
--cc=Claudiu.Zissulescu@synopsys.com \
--cc=Francois.Bedard@synopsys.com \
--cc=Vineet.Gupta1@synopsys.com \
--cc=geert@linux-m68k.org \
--cc=james.hogan@imgtec.com \
--cc=jeremy.bennett@embecosm.com \
--cc=joe@perches.com \
--cc=joern.rennecke@embecosm.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=richard.weinberger@gmail.com \
--cc=rusty@rustcorp.com.au \
--cc=sam@ravnborg.org \
--cc=tiwai@suse.de \
--cc=vineetg76@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).