diff options
| author | Peter Xu <peterx@redhat.com> | 2020-08-21 19:49:57 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-09-04 09:25:20 -0700 |
| commit | a308c71bf1e6e19cc2e4ced31853ee0fc7cb439a (patch) | |
| tree | f419a838cdc2f2616adfed4994465738a4167cac /mm/memory.c | |
| parent | 1a0cf26323c80e2f1c58fc04f15686de61bfab0c (diff) | |
mm/gup: Remove enfornced COW mechanism
With the more strict (but greatly simplified) page reuse logic in
do_wp_page(), we can safely go back to the world where cow is not
enforced with writes.
This essentially reverts commit 17839856fd58 ("gup: document and work
around 'COW can break either way' issue"). There are some context
differences due to some changes later on around it:
2170ecfa7688 ("drm/i915: convert get_user_pages() --> pin_user_pages()", 2020-06-03)
376a34efa4ee ("mm/gup: refactor and de-duplicate gup_fast() code", 2020-06-03)
Some lines moved back and forth with those, but this revert patch should
have striped out and covered all the enforced cow bits anyways.
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory.c')
0 files changed, 0 insertions, 0 deletions