linux-kernel - Re: [PATCH 2.6.24] x86: add sysfs interface for cpuid module

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Date:	Tue, 29 Jan 2008 09:44:35 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Yi Yang <yi.y.yang@...el.com>
Cc:	tglx@...utronix.de, hpa@...or.com, mingo@...hat.com,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH 2.6.24] x86: add sysfs interface for cpuid module

> +
> +static struct notifier_block __cpuinitdata cpuid_sysfs_cpu_notifier = {
> +	.notifier_call = cpuid_sysfs_cpu_callback,
> +};
Data is annotated _cpuintidata

but

> +
Data is annotated _cpuintidata

> @@ -217,11 +445,14 @@ static void __exit cpuid_exit(void)
>  {
>  	int cpu = 0;
>  
> -	for_each_online_cpu(cpu)
> +	for_each_online_cpu(cpu) {
>  		cpuid_device_destroy(cpu);
> +		remove_cpuid_sysfs(cpu);
> +	}
>  	class_destroy(cpuid_class);
>  	unregister_chrdev(CPUID_MAJOR, "cpu/cpuid");
>  	unregister_hotcpu_notifier(&cpuid_class_cpu_notifier);
> +	unregister_hotcpu_notifier(&cpuid_sysfs_cpu_notifier);

used in an __exit function.

You should have seen a Section mismatch warning for this.
The right fix is to annotate the cpuid_sysfs_cpu_notifier
with __initdata_refok (soon to be named __refdata)
Or even better to declare it const and use _refconst.

	Sam
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