linux-kernel - Re: [PATCH] x86: Don't write io

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Message-ID: <m1hbiv6fcb.fsf@fess.ebiederm.org>
Date:	Sun, 15 Aug 2010 08:55:00 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [PATCH] x86: Don't write io_apic ID if it is not changed

Yinghai Lu <yinghai@...nel.org> writes:

> For 32bit mptable path, setup_ids_from_mpc() always write io apic id
> register, even there is no change needed.
>
> So try to do that when they are different bewteen reading out and
> mptable

What is the advantage of not writing the value?

Eric

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