[PATCH 0/3] Cache maintenance on VIPT caches

[Catalin Marinas]

On Tue, 2010-07-20 at 18:56 +0900, FUJITA Tomonori wrote:
> On Fri, 16 Jul 2010 15:39:17 +0100
> Catalin Marinas <catalin.marinas at arm.com> wrote:
> > I'm not sure why sg_miter doesn't call flush_dcache_page() but
> > flush_kernel_dcache_page() (I cc'ed Fujita as he seems to have added
> > this code).
> 
> It is intended to handle D aliasing due to kmap. As cachetlb.txt says
> that it is assumed here that the user has no incoherent cached copies
> (it was already addressed elsewhere). So flush_dcache_page() does too
> much there.

A related question here - does flush_kernel_dcache_page() need to do
anything for non-highmem pages? For highmem pages, on ARM, we already
handle the cache flushing in kunmap().

-- 
Catalin