linux-kernel - Re: [RFC PATCH 1/8] x86/cpufeatures: Enumerate MOVDIRI instruction

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Message-ID: <alpine.DEB.2.21.1806191057210.1692@nanos.tec.linutronix.de>
Date:   Tue, 19 Jun 2018 10:57:44 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Fenghua Yu <fenghua.yu@...el.com>
cc:     Ingo Molnar <mingo@...hat.com>, H Peter Anvin <hpa@...or.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Alan Cox <alan@...ux.intel.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [RFC PATCH 1/8] x86/cpufeatures: Enumerate MOVDIRI instruction

On Fri, 15 Jun 2018, Fenghua Yu wrote:

> MOVDIRI moves doubleword or quadword from register to memory through
> direct store which is implemented by using write combining (WC) for
> writing data directly into memory without caching the data.

And that is useful for what?

Thanks,

	tglx