Re: [PATCH v4 0/2] mm/highmem: make kmap cache coloring aware
From: Joshua Kinard
Date: Mon Aug 25 2014 - 20:02:12 EST
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).
"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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