From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail202.messagelabs.com (mail202.messagelabs.com [216.82.254.227]) by kanga.kvack.org (Postfix) with ESMTP id 761816B006A for ; Wed, 7 Jul 2010 18:34:55 -0400 (EDT) Date: Wed, 7 Jul 2010 23:34:18 +0100 From: Russell King - ARM Linux Subject: Re: [patch 071/149] ARM: 6166/1: Proper prefetch abort handling on pre-ARMv6 Message-ID: <20100707223417.GA22673@n2100.arm.linux.org.uk> References: <20100701173212.785441106@clark.site> <20100701221420.GA10481@shutemov.name> <20100701221728.GA12187@suse.de> <20100701222541.GB10481@shutemov.name> <20100701224837.GA27389@flint.arm.linux.org.uk> <20100701225911.GC10481@shutemov.name> <20100701231207.GB27389@flint.arm.linux.org.uk> <20100706130618.GA14177@shutemov.name> <20100706225815.GA21834@flint.arm.linux.org.uk> <20100707085601.GA18732@shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100707085601.GA18732@shutemov.name> Sender: owner-linux-mm@kvack.org To: "Kirill A. Shutemov" Cc: linux-kernel@vger.kernel.org, alan@lxorguk.ukuu.org.uk, Anfei Zhou , Alexander Shishkin , Siarhei Siamashka , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org List-ID: On Wed, Jul 07, 2010 at 11:56:01AM +0300, Kirill A. Shutemov wrote: > But it seems that the problem is more global. Potentially, any of > pmd_none() check may produce false results. I don't see an easy way to fix > it. It isn't. We normally guarantee that we always fill on both L1 entries. The only exception is for the mappings specified via create_mapping() which is used for the static platform mappings. > Does Linux VM still expect one PTE table per page? Yes, and as far as I can see probably always will. Hence why we need to put two L1 entries in one page and lie to the kernel about the sizes of the hardware entries. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org