From: minchan.kim@gmail.com (Minchan Kim)
To: linux-arm-kernel@lists.infradead.org
Subject: Question of kmap_atomic
Date: Fri, 16 Jul 2010 11:52:20 +0900 [thread overview]
Message-ID: <AANLkTinphjSG89dQLadFZbJ9eVh7rJtm2N5-KT505ZzT@mail.gmail.com> (raw)
In-Reply-To: <alpine.LFD.2.00.1007152241110.10598@xanadu.home>
On Fri, Jul 16, 2010 at 11:46 AM, Nicolas Pitre <nico@fluxnic.net> wrote:
> On Fri, 16 Jul 2010, Minchan Kim wrote:
>
>> >> 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?
>> >
>> > No because with VIPT, the cache is tagged with physical addresses, and
>> > therefore the same cache data will be used for the same memory
>> > regardless of the virtual address used to reach it. ?On VIVT this is not
>> > the case and the comment in 7929eb9cf64 applies to VIVT only.
>>
>> Thanks for quick reply, Nicolas.
>>
>> My concern is following as.
>>
>> In VIPT alising model,
> [...]
>
> Highmem is not supported with VIPT alising and probably will never be.
> See commit 3f973e22.
It's clear.
Thanks, Nicolas.
--
Kind regards,
Minchan Kim
next prev parent reply other threads:[~2010-07-16 2:52 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 [this message]
2010-07-16 7:46 ` Russell King - ARM Linux
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