Re: [PATCH 2/2] drm/ttm: Fix vm page protection handling

[Kirill A. Shutemov]

On Tue, Dec 03, 2019 at 08:54:46AM +0100, Thomas Hellström (VMware) wrote:
> From: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
> 
> We were using an ugly hack to set the page protection correctly.
> Fix that and instead use vmf_insert_mixed_prot() and / or
> vmf_insert_pfn_prot().
> Also get the default page protection from
> struct vm_area_struct::vm_page_prot rather than using vm_get_page_prot().
> This way we catch modifications done by the vm system for drivers that
> want write-notification.

Hm. Why doesn't your VMA have the right prot flags in the first place? Why
do you need to override them? More context, please.

-- 
 Kirill A. Shutemov