linux-kernel - Re: [PATCH 46/47] Update and improve CRISv32 kernel/time.c

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Date:	Wed, 12 Dec 2007 03:33:25 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jesper Nilsson <jesper.nilsson@...s.com>
Cc:	Mikael Starvik <mikael.starvik@...s.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 46/47] Update and improve CRISv32 kernel/time.c

On Tue, 4 Dec 2007 17:25:45 +0100 Jesper Nilsson <jesper.nilsson@...s.com> wrote:

> +#ifdef CONFIG_CPU_FREQ
> +	cpufreq_register_notifier(&cris_time_freq_notifier_block,
> +		CPUFREQ_TRANSITION_NOTIFIER);
>  #endif

include/linux/cpufreq.h has

#ifdef CONFIG_CPU_FREQ
...
#else		/* CONFIG_CPU_FREQ */
static inline int cpufreq_register_notifier(struct notifier_block *nb,
						unsigned int list)
{
	return 0;
}


the idea is that you remove the above ifdefs and also the ifdefs around
cris_time_freq_notifier_block and then gcc magically removes
cris_time_freq_notifier_block from your generated code.

Advantages: no ifdefs, and full typechecking even when CONFIG_CPU_FREQ=n.


cpufreq_register_notifier() can fail but this code pretends otherwise...
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