linux-kernel - Re: [PATCH 1/2] i386: mce cleanup part1: functional change

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Message-Id: <E1IfHZg-0003dp-FA@flower>
Date:	Tue, 9 Oct 2007 18:04:48 +0200
From:	Oleg Verych <olecom@...wer.upol.cz>
To:	"Joerg Roedel" <joerg.roedel@....com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"Christoph Egger" <Christoph.Egger@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] i386: mce cleanup part1: functional change

* Tue,  9 Oct 2007 14:49:55 +0200

[]
> @@ -33,9 +33,20 @@ void fastcall (*machine_check_vector)(struct pt_regs *, long error_code) = unexp
>  /* This has to be run for each processor */
>  void mcheck_init(struct cpuinfo_x86 *c)
>  {
> +	uint32_t mca, mce;
> +
>  	if (mce_disabled==1)
>  		return;
>  
> +	mca = cpu_has(c, X86_FEATURE_MCA);
> +	mce = cpu_has(c, X86_FEATURE_MCE);
> +
> +	if (!mca || !mce) {
> +		printk(KERN_INFO "CPU%i: No machine check support available\n",
> +			smp_processor_id());
> +		return;
> +	}
> +

cpu_has() returns int,
but would it be better to have something like

  	if (!mce_disabled &&
	    !(c->x86_capability & (X86_FEATURE_MCA | X86_FEATURE_MCE)) {
		printk(KERN_INFO "CPU%i: No machine check support available\n",
			smp_processor_id());
		return;
	} else
		return;
?
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