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

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Date:	Sat, 19 Jun 2010 10:08:11 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"Justin P. Mattock" <justinmattock@...il.com>
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 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.

Perhaps you can just mark the nowarn variable __unused?

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
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