Re: [RFC 2.6.19 1/1] fbdev,mm: hecuba/E-Ink fbdev driver v2

On 12/22/06, Franck Bui-Huu <vagabon.xyz@xxxxxxxxx> wrote:

Well thinking more about it, this wouldn't work for all cache types.
For example, if your cache is not a direct maped one, this workaround
won't work. So this is definitely not a portable solution.


From asking peterz on #mm, I think page_mkclean will do the right
thing and call something like flush_cache_page. I think that resolves
the issue which I think you identified where the end symptom on archs
with virtually tagged caches could be a line of pixels written by
userspace through one PTE remain in-cache and therefore "undisplayed"
when the kernel reads through another PTE that may fall on a different
cacheline.

Thanks,
jayakumar
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