linux-kernel - Re: [CFT] MM: Pass a PTE pointer to update_mmu

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Date:	Fri, 22 Jan 2010 14:50:19 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Russell King <rmk+lkml@....linux.org.uk>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [CFT] MM: Pass a PTE pointer to update_mmu_cache() rather than
 the PTE itself

On Wed, 2010-01-20 at 13:52 +0000, Russell King wrote:
> On VIVT ARM, when we have multiple shared mappings of the same file
> in the same MM, we need to ensure that we have coherency across all
> copies.  We do this via make_coherent() by making the pages
> uncacheable.
> 
> This used to work fine, until we allowed highmem with highpte - we
> now have a page table which is mapped as required, and is not available
> for modification via update_mmu_cache().

Looks good. I'll test when I'm back from LCA.

Cheers,
Ben.


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