On Thu, 25 Jun 2009 12:09:34 +0900 Paul Mundt [off-list ref] wrote:

On Wed, Jun 24, 2009 at 07:56:47PM -0700, Andrew Morton wrote:

quoted

On Wed, 24 Jun 2009 19:54:13 +0900 Magnus Damm [off-list ref] wrote:

quoted

From: Magnus Damm <redacted>

This patch adds arch specific page protection support to deferred io.

Instead of overwriting the info->fbops->mmap pointer with the
deferred io specific mmap callback, modify fb_mmap() to include
a #ifdef wrapped call to fb_deferred_io_mmap().  The function
fb_deferred_io_mmap() is extended to call fb_pgprotect() in the
case of non-vmalloc() frame buffers.

With this patch uncached deferred io can be used together with
the sh_mobile_lcdcfb driver. Without this patch arch specific
page protection code in fb_pgprotect() never gets invoked with
deferred io.

Signed-off-by: Magnus Damm <redacted>
---

 For proper runtime operation with uncached vmas make sure
 "[PATCH][RFC] mm: uncached vma support with writenotify"
 is applied. There are no merge order dependencies.

So this is dependent upon a patch which is in your tree, which is in
linux-next?

This patch is not in the sh tree, either, we wanted it to go via -mm, but
it has the issue that it depends on pgprot_noncached() being generally
defined, so there is a bit of an ordering mess. It could be re-posted
with an ifdef pgprot_noncached to get it merged while we wait for the
outstanding architectures to catch up, and this is indeed what the bulk
of the in-tree pgprot_noncached() users in generic places end up doing
already.

Of course I can take both through the sh tree once people are happy with
the patches.

That's OK by me - the patches are small and there's not much point in
going all formal over who-does-which-bit.

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