diff options
| author | Michal Hocko <mhocko@suse.com> | 2018-10-26 15:03:39 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-10-26 16:25:19 -0700 |
| commit | 4e15a073a168b62311db911a55c4d4f1500c2821 (patch) | |
| tree | 0dcb72a877f2afa6dc1012ce3d3d284528331369 /mm | |
| parent | 33490af3f5c15757448b6c454ca93b48a333aa1b (diff) | |
Revert "mm, mmu_notifier: annotate mmu notifiers with blockable invalidate callbacks"
Revert 5ff7091f5a2ca ("mm, mmu_notifier: annotate mmu notifiers with
blockable invalidate callbacks").
MMU_INVALIDATE_DOES_NOT_BLOCK flags was the only one used and it is no
longer needed since 93065ac753e4 ("mm, oom: distinguish blockable mode for
mmu notifiers"). We now have a full support for per range !blocking
behavior so we can drop the stop gap workaround which the per notifier
flag was used for.
Link: http://lkml.kernel.org/r/20180827112623.8992-4-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/mmu_notifier.c | 31 |
1 files changed, 0 insertions, 31 deletions
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c index 82bb1a939c0e..5119ff846769 100644 --- a/mm/mmu_notifier.c +++ b/mm/mmu_notifier.c @@ -247,37 +247,6 @@ void __mmu_notifier_invalidate_range(struct mm_struct *mm, } EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range); -/* - * Must be called while holding mm->mmap_sem for either read or write. - * The result is guaranteed to be valid until mm->mmap_sem is dropped. - */ -bool mm_has_blockable_invalidate_notifiers(struct mm_struct *mm) -{ - struct mmu_notifier *mn; - int id; - bool ret = false; - - WARN_ON_ONCE(!rwsem_is_locked(&mm->mmap_sem)); - - if (!mm_has_notifiers(mm)) - return ret; - - id = srcu_read_lock(&srcu); - hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) { - if (!mn->ops->invalidate_range && - !mn->ops->invalidate_range_start && - !mn->ops->invalidate_range_end) - continue; - - if (!(mn->ops->flags & MMU_INVALIDATE_DOES_NOT_BLOCK)) { - ret = true; - break; - } - } - srcu_read_unlock(&srcu, id); - return ret; -} - static int do_mmu_notifier_register(struct mmu_notifier *mn, struct mm_struct *mm, int take_mmap_sem) |