[PATCH 4/5] mm, notifier: Catch sleeping/blocking for !blockable

[Daniel Vetter]

We need to make sure implementations don't cheat and don't have a
possible schedule/blocking point deeply burried where review can't
catch it.

I'm not sure whether this is the best way to make sure all the
might_sleep() callsites trigger, and it's a bit ugly in the code flow.
But it gets the job done.

Inspired by an i915 patch series which did exactly that, because the
rules haven't been entirely clear to us.

v2: Use the shiny new non_block_start/end annotations instead of
abusing preempt_disable/enable.

v3: Rebase on top of Glisse's arg rework.

v4: Rebase on top of more Glisse rework.

v5: Also annotate invalidate_range_end in the same style. I hope I got
Jason's request for this right.

Cc: Jason Gunthorpe <jgg at ziepe.ca>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: Michal Hocko <mhocko at suse.com>
Cc: David Rientjes <rientjes at google.com>
Cc: "Christian König" <christian.koenig at amd.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: "Jérôme Glisse" <jglisse at redhat.com>
Cc: linux-mm at kvack.org
Reviewed-by: Christian König <christian.koenig at amd.com> (v1)
Reviewed-by: Jérôme Glisse <jglisse at redhat.com> (v4)
Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
 mm/mmu_notifier.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index 0523555933c9..b17f3fd3779b 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -181,7 +181,13 @@ int __mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range)
 	id = srcu_read_lock(&srcu);
 	hlist_for_each_entry_rcu(mn, &range->mm->mmu_notifier_mm->list, hlist) {
 		if (mn->ops->invalidate_range_start) {
-			int _ret = mn->ops->invalidate_range_start(mn, range);
+			int _ret;
+
+			if (!mmu_notifier_range_blockable(range))
+				non_block_start();
+			_ret = mn->ops->invalidate_range_start(mn, range);
+			if (!mmu_notifier_range_blockable(range))
+				non_block_end();
 			if (_ret) {
 				pr_info("%pS callback failed with %d in %sblockable context.\n",
 					mn->ops->invalidate_range_start, _ret,
@@ -224,8 +230,13 @@ void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range,
 			mn->ops->invalidate_range(mn, range->mm,
 						  range->start,
 						  range->end);
-		if (mn->ops->invalidate_range_end)
+		if (mn->ops->invalidate_range_end) {
+			if (!mmu_notifier_range_blockable(range))
+				non_block_start();
 			mn->ops->invalidate_range_end(mn, range);
+			if (!mmu_notifier_range_blockable(range))
+				non_block_end();
+		}
 	}
 	srcu_read_unlock(&srcu, id);
 	lock_map_release(&__mmu_notifier_invalidate_range_start_map);
-- 
2.23.0