linux-kernel - Re: [PATCH 5/6]kernel:module.c variable 'nowarn' set but not used

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Date:	Sat, 19 Jun 2010 06:41:38 -0700
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	linux-kernel@...r.kernel.org, linux-audit@...hat.com,
	zippel@...ux-m68k.org, linux-fsdevel@...r.kernel.org,
	rusty@...tcorp.com.au
Subject: Re: [PATCH 5/6]kernel:module.c variable 'nowarn' set but not used

On 06/19/2010 01:08 AM, Geert Uytterhoeven wrote:
> On Sat, Jun 19, 2010 at 07:04, Justin P. Mattock
> <justinmattock@...il.com>  wrote:
>>> Also wrong, you removed the creation of the links in sysfs.
>>>
>>> The assignment to nowarn was there to avoid another compiler warning,
>>> as sysfs_create_link() is marked __must_check.
>>
>> I also went back to this one and made the following changes.. let me know if
>> it's wrong etc..
>>
>>  From 4f45beed80627d2bb32fb021bb6d22d88089557b Mon Sep 17 00:00:00 2001
>> From: Justin P. Mattock<justinmattock@...il.com>
>> Date: Fri, 18 Jun 2010 22:01:07 -0700
>> Subject: [PATCH 5/5] module.c
>>   Signed-off-by: Justin P. Mattock<justinmattock@...il.com>
>>
>> ---
>>   kernel/module.c |    3 +--
>>   1 files changed, 1 insertions(+), 2 deletions(-)
>>
>> diff --git a/kernel/module.c b/kernel/module.c
>> index 8c6b428..48fc5c8 100644
>> --- a/kernel/module.c
>> +++ b/kernel/module.c
>> @@ -1340,11 +1340,10 @@ static void add_usage_links(struct module *mod)
>>   {
>>   #ifdef CONFIG_MODULE_UNLOAD
>>         struct module_use *use;
>> -       int nowarn;
>>
>>         mutex_lock(&module_mutex);
>>         list_for_each_entry(use,&mod->target_list, target_list) {
>> -               nowarn = sysfs_create_link(use->target->holders_dir,
>> +               sysfs_create_link(use->target->holders_dir,
>>                                            &mod->mkobj.kobj, mod->name);
>>         }
>>         mutex_unlock(&module_mutex);
>> --
>> 1.7.1.rc1.21.gf3bd6
>>
>> if it looks good, then I can resend it out.
>
> Have you compile-tested this?
> As sysfs_create_link() is marked __must_check, that will cause another compiler
> warning, but only if CONFIG_SYSFS=y.
>

yeah I did compile test this. greping SYSFS I do have that enabled in 
the kernel just to make sure I reset the kernel compiled the warning 
showed up, thenI applied this patch and the warning was not there.
could be something different then.

> Perhaps you can just mark the nowarn variable __unused?

sure.. I'll give that a try..

>
> Gr{oetje,eeting}s,
>
> 						Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> 							    -- Linus Torvalds
>


again Thanks for your time and info.

Justin P. Mattock
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