From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: linux-kernel@vger.kernel.org, alan@lxorguk.ukuu.org.uk,
Anfei Zhou <anfei.zhou@gmail.com>,
Alexander Shishkin <virtuoso@slind.org>,
Siarhei Siamashka <siarhei.siamashka@nokia.com>,
linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org
Subject: Re: [patch 071/149] ARM: 6166/1: Proper prefetch abort handling on pre-ARMv6
Date: Wed, 7 Jul 2010 23:34:18 +0100 [thread overview]
Message-ID: <20100707223417.GA22673@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20100707085601.GA18732@shutemov.name>
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.
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next prev parent reply other threads:[~2010-07-07 22:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20100701175144.GA2116@kroah.com>
[not found] ` <20100701173212.785441106@clark.site>
[not found] ` <20100701221420.GA10481@shutemov.name>
[not found] ` <20100701221728.GA12187@suse.de>
[not found] ` <20100701222541.GB10481@shutemov.name>
[not found] ` <20100701224837.GA27389@flint.arm.linux.org.uk>
[not found] ` <20100701225911.GC10481@shutemov.name>
[not found] ` <20100701231207.GB27389@flint.arm.linux.org.uk>
[not found] ` <20100706130618.GA14177@shutemov.name>
[not found] ` <20100706225815.GA21834@flint.arm.linux.org.uk>
2010-07-07 8:56 ` [patch 071/149] ARM: 6166/1: Proper prefetch abort handling on pre-ARMv6 Kirill A. Shutemov
2010-07-07 22:34 ` Russell King - ARM Linux [this message]
2010-07-08 11:31 ` Kirill A. Shutemov
2010-07-12 22:08 ` Kirill A. Shutemov
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