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

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Message-ID: <20071009163230.GC22435@flower.upol.cz>
Date:	Tue, 9 Oct 2007 18:32:30 +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

On Tue, Oct 09, 2007 at 06:06:05PM +0200, Joerg Roedel wrote:
> > 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());
> 
> This looks complicated and is harder to read. Its exactly the purpose of the
> cpu_has() macro to avoid such constructs.

It is done via test_bit(), which is designed for IO access with all that
`const volatile' stuff, 2 x unnecessary, can't be optimized here (IMHO).
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