linux-kernel - Re: [RFC PATCH v5 1/2] sysctl: Make neg

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Message-ID: <20140125084800.GA16070@gmail.com>
Date:	Sat, 25 Jan 2014 09:48:00 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Aaron Tomlin <atomlin@...hat.com>
Cc:	linux-kernel@...r.kernel.org, rientjes@...gle.com,
	mingo@...hat.com, oleg@...hat.com, riel@...hat.com,
	akpm@...ux-foundation.org
Subject: Re: [RFC PATCH v5 1/2] sysctl: Make neg_one a standard constraint


* Aaron Tomlin <atomlin@...hat.com> wrote:

> Add neg_one to the list of standard constraints.
> 
> Signed-off-by: Aaron Tomlin <atomlin@...hat.com>
> Acked-by: Rik van Riel <riel@...hat.com>
> Acked-by: David Rientjes <rientjes@...gle.com>
> ---
>  kernel/sysctl.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 34a6047..dd531a6 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -122,6 +122,7 @@ extern int blk_iopoll_enabled;
>  static int sixty = 60;
>  #endif
>  
> +static int neg_one = -1;
>  static int zero;
>  static int __maybe_unused one = 1;
>  static int __maybe_unused two = 2;

So what happens if CONFIG_DETECT_HUNG_TASK is not defined and neg_one 
is unused? The compiler generates an unused variable warning.

Thanks,

	Ingo


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