On Mon, Oct 19, 2020 at 11:14 PM Matthew Wilcox <willy@infradead.org> wrote:

> On Mon, Oct 19, 2020 at 10:56:20PM +0800, Xie Yongji wrote:
> > Export zap_page_range() for use in VDUSE.
>
> I think you're missing a lot of MMU notifier work by calling this
> directly.  It probably works in every scenario you've tested, but won't
> work for others.  I see you're using VM_MIXEDMAP -- would it make sense
> to use VM_PFNMAP instead and use zap_vma_ptes()?


But I didn't see any difference between zap_vma_ptes() and zap_page_range()
about MMU notifier. Could you give me more details?

Thanks,
Yongji


> Or would it make sense
> to change zap_vma_ptes() to handle VM_MIXEDMAP as well as VM_PFNMAP?
>
>