linux-kernel - Re: [PATCH 5/8] x86, mce: introduce mce_sysdev

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Date:	Fri, 17 Jun 2011 18:32:41 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Luck, Tony" <tony.luck@...el.com>, Borislav Petkov <bp@...64.org>
Subject: Re: [PATCH 5/8] x86, mce: introduce mce_sysdev_init()

On Fri, Jun 17, 2011 at 04:45:44AM -0400, Hidetoshi Seto wrote:
> As a one of mce_sysdev_ family, coordinate a single function that
> initializes sysfs hierarchy here.
> 
> Signed-off-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
> ---
>  arch/x86/kernel/cpu/mcheck/mce.c |   65 ++++++++++++++++++++-----------------
>  1 files changed, 35 insertions(+), 30 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
> index ad0e9fb..0424299 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce.c
> +++ b/arch/x86/kernel/cpu/mcheck/mce.c
> @@ -1953,6 +1953,39 @@ static __cpuinit void mce_sysdev_remove(unsigned int cpu)
>  	cpumask_clear_cpu(cpu, mce_sysdev_initialized);
>  }
>  
> +static __init int mce_sysdev_init(void)
> +{
> +	int err, i;
> +
> +	zalloc_cpumask_var(&mce_sysdev_initialized, GFP_KERNEL);
> +
> +	/* init attributes for each mce_banks */
> +	for (i = 0; i < banks; i++) {
> +		struct mce_bank *b = &mce_banks[i];
> +		struct sysdev_attribute *a = &b->attr;
> +
> +		sysfs_attr_init(&a->attr);
> +		a->attr.name	= b->attrname;
> +		snprintf(b->attrname, ATTR_LEN, "bank%d", i);
> +
> +		a->attr.mode	= 0644;
> +		a->show		= show_bank;
> +		a->store	= set_bank;
> +	}
> +
> +	err = sysdev_class_register(&mce_sysdev_class);
> +	if (err)
> +		return err;
> +
> +	for_each_online_cpu(i) {
> +		err = mce_sysdev_create(i);
> +		if (err)
> +			return err;
> +	}

Yeah, let's handle the error case here and unwind to a sane state:

	if (err)
		goto sysdev_unwind;
...

sysdev_unwind:
	while (--i > 0)
		mce_sysdev_remove(i);


> +
> +	return err;
> +}
> +
>  /* Make sure there are no machine checks on offlined CPUs. */
>  static void __cpuinit mce_disable_cpu(void *h)
>  {
> @@ -2025,46 +2058,18 @@ static struct notifier_block mce_cpu_notifier __cpuinitdata = {
>  	.notifier_call = mce_cpu_callback,
>  };
>  
> -static __init void mce_init_banks(void)
> -{
> -	int i;
> -
> -	for (i = 0; i < banks; i++) {
> -		struct mce_bank *b = &mce_banks[i];
> -		struct sysdev_attribute *a = &b->attr;
> -
> -		sysfs_attr_init(&a->attr);
> -		a->attr.name	= b->attrname;
> -		snprintf(b->attrname, ATTR_LEN, "bank%d", i);
> -
> -		a->attr.mode	= 0644;
> -		a->show		= show_bank;
> -		a->store	= set_bank;
> -	}
> -}
> -
>  static __init int mcheck_init_device(void)
>  {
>  	int err;
> -	int i = 0;
>  
>  	if (!mce_available(&boot_cpu_data))
>  		return -EIO;
>  
> -	zalloc_cpumask_var(&mce_sysdev_initialized, GFP_KERNEL);
> -
> -	mce_init_banks();
> -
> -	err = sysdev_class_register(&mce_sysdev_class);
> +	/* register sysfs interface */
> +	err = mce_sysdev_init();
>  	if (err)
>  		return err;
>  
> -	for_each_online_cpu(i) {
> -		err = mce_sysdev_create(i);
> -		if (err)
> -			return err;
> -	}
> -
>  	register_syscore_ops(&mce_syscore_ops);
>  	register_hotcpu_notifier(&mce_cpu_notifier);
>  
> -- 
> 1.7.1

Thanks.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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