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

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Message-ID: <45a44e480612271953we6fe8adg118560161579b7f9@mail.gmail.com>
Date:	Thu, 28 Dec 2006 04:53:13 +0100
From:	"Jaya Kumar" <jayakumar.lkml@...il.com>
To:	"Franck Bui-Huu" <vagabon.xyz@...il.com>
Cc:	linux-fbdev-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC 2.6.19 1/1] fbdev,mm: hecuba/E-Ink fbdev driver v2

On 12/22/06, Franck Bui-Huu <vagabon.xyz@...il.com> 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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