[v5,0/2] mm, drm/ttm: Fix pte insertion with customized protection

Message

Thomas Hellström (Intel) Jan. 15, 2020, 12:41 p.m. UTC

From: Thomas Hellstrom <[e-mail]>

The drm/ttm module is using a modified on-stack copy of the
struct vm_area_struct to be able to set a page protection with customized
caching. Fix that by adding a vmf_insert_mixed_prot() function similar
to the existing vmf_insert_pfn_prot() for use with drm/ttm.

Patches are acked to be merged through a drm tree.

Changes since v1:
*) Formatting fixes in patch 1
*) Updated commit message of patch 2.
Changes since v2:
*) Moved vmf_insert_mixed_prot() export to patch 2 (Michal Hocko)
*) Documented under which conditions it's safe to use a page protection
   different from struct vm_area_struct::vm_page_prot. (Michal Hocko)
Changes since v3:
*) More documentation regarding under which conditions it's safe to use a
   page protection different from struct vm_area_struct::vm_page_prot. This
   time also in core vm. (Michal Hocko)
Changes since v4:
*) Fixed a typo
*) Added acks.

Cc: Andrew Morton <[e-mail]>
Cc: Michal Hocko <[e-mail]>
Cc: "Matthew Wilcox (Oracle)" <[e-mail]>
Cc: "Kirill A. Shutemov" <[e-mail]>
Cc: Ralph Campbell <[e-mail]>
Cc: "Jérôme Glisse" <[e-mail]>
Cc: "Christian König" <[e-mail]>