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SubjectRe: [PATCH 1/3] drivers/gpu/drm/via: convert put_page() to put_user_page*()
On Mon, Jul 22, 2019 at 11:53:54AM -0700, John Hubbard wrote:
> On 7/22/19 2:33 AM, Christoph Hellwig wrote:
> > On Sun, Jul 21, 2019 at 09:30:10PM -0700, john.hubbard@gmail.com wrote:
> >> for (i = 0; i < vsg->num_pages; ++i) {
> >> if (NULL != (page = vsg->pages[i])) {
> >> if (!PageReserved(page) && (DMA_FROM_DEVICE == vsg->direction))
> >> - SetPageDirty(page);
> >> - put_page(page);
> >> + put_user_pages_dirty(&page, 1);
> >> + else
> >> + put_user_page(page);
> >> }
> >
> > Can't just pass a dirty argument to put_user_pages? Also do we really
>
> Yes, and in fact that would help a lot more than the single page case,
> which is really just cosmetic after all.
>
> > need a separate put_user_page for the single page case?
> > put_user_pages_dirty?
>
> Not really. I'm still zeroing in on the ideal API for all these call sites,
> and I agree that the approach below is cleaner.

so enum { CLEAN = 0, DIRTY = 1, LOCK = 2, DIRTY_LOCK = 3 };
?

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