linux-kernel - Re: [PATCH] kernel/cpu.c: Add right qualifiers for intel_thermal_interrupt() and cpu_hotplug_pm_sync

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Date:	Fri, 11 Nov 2011 12:56:43 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Fenghua Yu <fenghua.yu@...el.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-pm <linux-pm@...r.kernel.org>,
	linux-next <linux-next@...r.kernel.org>,
	Fenghua Yu <fenghua.yu@...el.com>
Subject: Re: [PATCH] kernel/cpu.c: Add right qualifiers for intel_thermal_interrupt()
 and cpu_hotplug_pm_sync_init()

On 11/11/2011 01:52 AM, Fenghua Yu wrote:
> From: Fenghua Yu <fenghua.yu@...el.com>
> 
> Add __init for functions alloc_frozen_cpus() and cpu_hotplug_pm_sync_init()
> because they are only called during boot time.
> 
> Add static for function cpu_hotplug_pm_sync_init() because its scope is limited
> in this file only.
> 
> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
> ---
>  kernel/cpu.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/cpu.c b/kernel/cpu.c
> index 563f136..cf915b8 100644
> --- a/kernel/cpu.c
> +++ b/kernel/cpu.c
> @@ -470,7 +470,7 @@ out:
>  	cpu_maps_update_done();
>  }
> 
> -static int alloc_frozen_cpus(void)
> +static int __init alloc_frozen_cpus(void)
>  {
>  	if (!alloc_cpumask_var(&frozen_cpus, GFP_KERNEL|__GFP_ZERO))
>  		return -ENOMEM;
> @@ -543,7 +543,7 @@ cpu_hotplug_pm_callback(struct notifier_block *nb,
>  }
> 
> 
> -int cpu_hotplug_pm_sync_init(void)
> +static int __init cpu_hotplug_pm_sync_init(void)
>  {
>  	pm_notifier(cpu_hotplug_pm_callback, 0);

pm_notifier() macro will declare a static variable. I agree this won't
be any problem functionality-wise. But it doesn't seem elegant to say
"throw away the function but keep the static variable".
So, if you want to add __init qualifier to this function, I suggest that
you declare the static variable outside the function, and call
register_pm_notifier() in the function, just to ensure it doesn't obscure
things.

And please change the title, it talks about intel_thermal_interrupt()!

Thanks,
Srivatsa S. Bhat

>  	return 0;
--
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