[PATCH v4 0/2] mm, drm/ttm: Fix pte insertion with customized protection

[Thomas HellstrÃm (VMware)]

From: Thomas Hellstrom <thellstrom@xxxxxxxxxx>

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.

I'd like to merge this 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)

Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Ralph Campbell <rcampbell@xxxxxxxxxx>
Cc: "JÃrÃme Glisse" <jglisse@xxxxxxxxxx>
Cc: "Christian KÃnig" <christian.koenig@xxxxxxx>

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