linux-kernel - Re: [PATCH] x86, setup: add __flush

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Date:	Fri, 26 Sep 2014 07:20:23 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Bryan O'Donoghue <pure.logic@...us-software.ie>,
	Ong Boon Leong <boon.leong.ong@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH] x86, setup: add __flush_tlb() for Intel Quark X1000

On 09/26/2014 01:44 AM, Bryan O'Donoghue wrote:
> 
> +    /*
> +     * Locate the page directory and flush the TLB.
> +     *
> +     * On Quark X1000 CPUs we still have the PGE bit incorrectly set
> +     * due to a processor erratum, so __flush_tlb_all() is not yet
> +     * doing what it says.  Fortunately we have a cr3 flush here,
> +     * which is what is needed in this processor to flush TLBs, so
> +     * there's no need to add a Quark X1000 quirk here.
> +     *
> +     * early_init_intel will unset the X86_FEATURE_PGE flag later
> +     * and __flush_tlb_all() will flush via cr3
> +     */

That looks fine to me.
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