linux-kernel - Re: [PATCH] x86_64: remove wrong setting about CONSTANT

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Message-ID: <20080226072035.GB24820@elte.hu>
Date:	Tue, 26 Feb 2008 08:20:35 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <Yinghai.Lu@....COM>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86_64: remove wrong setting about CONSTANT_TSC for
	intel cpu


* Yinghai Lu <Yinghai.Lu@....COM> wrote:

> also fix error in early_init_intel and reference about x86_capality, 
> because it is array already.., prevent possible data corruption...

hm, why should there be data corruption:

> -		set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability);
> +		set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);

cpu_cpu_cap() is currently defined as:

 #define set_cpu_cap(c, bit)     set_bit(bit, (unsigned long *)((c)->x86_capability)

which is the same. set_cpu_cap() is indeed the cleaner form to do this 
so your patch is correct as a cleanup.

	Ingo
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