From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: Question of kmap_atomic
Date: Fri, 16 Jul 2010 08:46:20 +0100 [thread overview]
Message-ID: <20100716074620.GA16124@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <AANLkTilFvE0eyQS7jNQ77OYkJovJugjKRO-fPHjX8CB9@mail.gmail.com>
On Fri, Jul 16, 2010 at 09:41:59AM +0900, Minchan Kim wrote:
> I am stuck with looking at ARM's kmap_atomic.
> I am not familiar with ARM cache model.
> As I look the code, ARM seems to have a VIPT aliasing model.
>
> Before Nicolas's 17ebba1fe, kmap_atomic always calls kmap_high_get to
> prevent aliasing problem of 7929eb9cf64 regardless of VIVT and VIPT.
>
> But the patch made it to not call kmap_high_get when VIPT-aliasing
> model in CONFIG_DEBUG_HIGHMEM.
> Doesn't it cause aliasing problem as 7929eb9cf64 says, again?
There's various problems with highmem and VIPT aliasing caches, so we don't
permit its use with such caches.
prev parent reply other threads:[~2010-07-16 7:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <AANLkTilFvE0eyQS7jNQ77OYkJovJugjKRO-fPHjX8CB9@mail.gmail.com>
2010-07-16 0:44 ` Question of kmap_atomic Minchan Kim
2010-07-16 2:10 ` Nicolas Pitre
2010-07-16 2:31 ` Minchan Kim
2010-07-16 2:46 ` Nicolas Pitre
2010-07-16 2:52 ` Minchan Kim
2010-07-16 7:46 ` Russell King - ARM Linux [this message]
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