linux-kernel - Re: [PATCH] kernel/params.c: make use of unused but set variable

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Date:	Tue, 16 Jun 2015 15:54:01 -0400
From:	Tejun Heo <htejun@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Louis Langholtz <lou_langholtz@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	trivial@...nel.org, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] kernel/params.c: make use of unused but set variable

Hello, Rusty.

On Mon, Jun 15, 2015 at 05:19:26AM +0930, Rusty Russell wrote:
> Oh.  Perhaps my sense of humour is miscalibrated.

Heh, prolly mine was.  Sorry if I came off as aggressive.

> ===
> Subject: params: suppress unused variable error, warn once just in case code changes.
> 
> It shouldn't fail due to OOM (it's boot time), and already warns if we
> get two identical names.  But you never know what the future holds, and
> WARN_ON_ONCE() keeps gcc happy with minimal code.
> 
> Reported-by: Louis Langholtz <lou_langholtz@...com>
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> 
> diff --git a/kernel/params.c b/kernel/params.c
> index 7edf31f2ce96..0b9bbdf830cb 100644
> --- a/kernel/params.c
> +++ b/kernel/params.c
> @@ -884,6 +884,7 @@ static void __init version_sysfs_builtin(void)
>  		mk = locate_module_kobject(vattr->module_name);
>  		if (mk) {
>  			err = sysfs_create_file(&mk->kobj, &vattr->mattr.attr);
> +			WARN_ON_ONCE(err);
>  			kobject_uevent(&mk->kobj, KOBJ_ADD);

Looks good to me.  Please feel free to add

 Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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