Re: [RFC PATCH v5 1/2] sysctl: Make neg_one a standard constraint

[Ingo Molnar <mingo@kernel.org>]

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

> Add neg_one to the list of standard constraints.
> 
> Signed-off-by: Aaron Tomlin <atomlin@redhat.com>
> Acked-by: Rik van Riel <riel@redhat.com>
> Acked-by: David Rientjes <rientjes@google.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