linux-kernel - Re: [PATCH] perf_counter: do not create perf counter mlock sysctl when CONFIG_PERF

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Date:	Fri, 22 May 2009 21:25:10 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Subject: Re: [PATCH] perf_counter: do not create perf counter mlock sysctl
	when CONFIG_PERF_COUNTERS=n


* Ian Campbell <Ian.Campbell@...rix.com> wrote:

> Building tip from 82811bee3 without CONFIG_PERF_COUNTERS results in:
> 
>   CC      kernel/sysctl.o
> kernel/sysctl.c:928: error: 'sysctl_perf_counter_mlock' undeclared here (not in a function)
> 
> This is due to c5078f78b "perf_counter: provide an mlock threshold"
> 
> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 44ebd90..c2a4467 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -922,6 +922,7 @@ static struct ctl_table kern_table[] = {
>  		.child		= slow_work_sysctls,
>  	},
>  #endif
> +#ifdef CONFIG_PERF_COUNTERS
>  	{
>  		.ctl_name	= CTL_UNNUMBERED,
>  		.procname	= "perf_counter_mlock_kb",
> @@ -930,6 +931,7 @@ static struct ctl_table kern_table[] = {
>  		.mode		= 0644,
>  		.proc_handler	= &proc_dointvec,
>  	},
> +#endif
>  /*
>   * NOTE: do not add new entries to this table unless you have read
>   * Documentation/sysctl/ctl_unnumbered.txt

Hm, is this still needed? It doesnt apply here and i'm not seeing 
build failures.

Thanks,

	Ingo
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