linux-kernel - Re: [PATCH v4 0/2] mm/highmem: make kmap cache coloring aware

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Date:	Mon, 25 Aug 2014 19:55:53 -0400
From:	Joshua Kinard <kumba@...too.org>
To:	Ralf Baechle <ralf@...ux-mips.org>,
	Max Filippov <jcmvbkbc@...il.com>
CC:	linux-xtensa@...ux-xtensa.org, Chris Zankel <chris@...kel.net>,
	Marc Gauthier <marc@...ence.com>, linux-mm@...ck.org,
	linux-arch@...r.kernel.org, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org, David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Leonid Yegoshin <Leonid.Yegoshin@...tec.com>,
	Steven Hill <Steven.Hill@...tec.com>
Subject: Re: [PATCH v4 0/2] mm/highmem: make kmap cache coloring aware

On 08/25/2014 13:16, Ralf Baechle wrote:
> On Sat, Aug 02, 2014 at 05:11:37AM +0400, Max Filippov wrote:
> 
>> this series adds mapping color control to the generic kmap code, allowing
>> architectures with aliasing VIPT cache to use high memory. There's also
>> use example of this new interface by xtensa.
> 
> I haven't actually ported this to MIPS but it certainly appears to be
> the right framework to get highmem aliases handled on MIPS, too.
> 
> Though I still consider increasing PAGE_SIZE to 16k the preferable
> solution because it will entirly do away with cache aliases.

Won't setting PAGE_SIZE to 16k break some existing userlands (o32)?  I use a
4k PAGE_SIZE because the last few times I've tried 16k or 64k, init won't
load (SIGSEGVs or such, which panicks the kernel).

-- 
Joshua Kinard
Gentoo/MIPS
kumba@...too.org
4096R/D25D95E3 2011-03-28

"The past tempts us, the present confuses us, the future frightens us.  And
our lives slip away, moment by moment, lost in that vast, terrible in-between."

--Emperor Turhan, Centauri Republic
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