Merge tag 'for-linus-hmm' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma

Pull hmm updates from Jason Gunthorpe:
 "This is more cleanup and consolidation of the hmm APIs and the very
  strongly related mmu_notifier interfaces. Many places across the tree
  using these interfaces are touched in the process. Beyond that a
  cleanup to the page walker API and a few memremap related changes
  round out the series:

   - General improvement of hmm_range_fault() and related APIs, more
     documentation, bug fixes from testing, API simplification &
     consolidation, and unused API removal

   - Simplify the hmm related kconfigs to HMM_MIRROR and DEVICE_PRIVATE,
     and make them internal kconfig selects

   - Hoist a lot of code related to mmu notifier attachment out of
     drivers by using a refcount get/put attachment idiom and remove the
     convoluted mmu_notifier_unregister_no_release() and related APIs.

   - General API improvement for the migrate_vma API and revision of its
     only user in nouveau

   - Annotate mmu_notifiers with lockdep and sleeping region debugging

  Two series unrelated to HMM or mmu_notifiers came along due to
  dependencies:

   - Allow pagemap's memremap_pages family of APIs to work without
     providing a struct device

   - Make walk_page_range() and related use a constant structure for
     function pointers"

* tag 'for-linus-hmm' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma: (75 commits)
  libnvdimm: Enable unit test infrastructure compile checks
  mm, notifier: Catch sleeping/blocking for !blockable
  kernel.h: Add non_block_start/end()
  drm/radeon: guard against calling an unpaired radeon_mn_unregister()
  csky: add missing brackets in a macro for tlb.h
  pagewalk: use lockdep_assert_held for locking validation
  pagewalk: separate function pointers from iterator data
  mm: split out a new pagewalk.h header from mm.h
  mm/mmu_notifiers: annotate with might_sleep()
  mm/mmu_notifiers: prime lockdep
  mm/mmu_notifiers: add a lockdep map for invalidate_range_start/end
  mm/mmu_notifiers: remove the __mmu_notifier_invalidate_range_start/end exports
  mm/hmm: hmm_range_fault() infinite loop
  mm/hmm: hmm_range_fault() NULL pointer bug
  mm/hmm: fix hmm_range_fault()'s handling of swapped out pages
  mm/mmu_notifiers: remove unregister_no_release
  RDMA/odp: remove ib_ucontext from ib_umem
  RDMA/odp: use mmu_notifier_get/put for 'struct ib_ucontext_per_mm'
  RDMA/mlx5: Use odp instead of mr->umem in pagefault_mr
  RDMA/mlx5: Use ib_umem_start instead of umem.address
  ...

1 files changed, 12 insertions, 13 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 597d58101872..f3c15bb07cce 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -25,7 +25,7 @@
 #include <linux/page_counter.h>
 #include <linux/memcontrol.h>
 #include <linux/cgroup.h>
-#include <linux/mm.h>
+#include <linux/pagewalk.h>
 #include <linux/sched/mm.h>
 #include <linux/shmem_fs.h>
 #include <linux/hugetlb.h>
@@ -5499,17 +5499,16 @@ static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd,
 	return 0;
 }
 
+static const struct mm_walk_ops precharge_walk_ops = {
+	.pmd_entry	= mem_cgroup_count_precharge_pte_range,
+};
+
 static unsigned long mem_cgroup_count_precharge(struct mm_struct *mm)
 {
 	unsigned long precharge;
 
-	struct mm_walk mem_cgroup_count_precharge_walk = {
-		.pmd_entry = mem_cgroup_count_precharge_pte_range,
-		.mm = mm,
-	};
 	down_read(&mm->mmap_sem);
-	walk_page_range(0, mm->highest_vm_end,
-			&mem_cgroup_count_precharge_walk);
+	walk_page_range(mm, 0, mm->highest_vm_end, &precharge_walk_ops, NULL);
 	up_read(&mm->mmap_sem);
 
 	precharge = mc.precharge;
@@ -5778,13 +5777,12 @@ put:			/* get_mctgt_type() gets the page */
 	return ret;
 }
 
+static const struct mm_walk_ops charge_walk_ops = {
+	.pmd_entry	= mem_cgroup_move_charge_pte_range,
+};
+
 static void mem_cgroup_move_charge(void)
 {
-	struct mm_walk mem_cgroup_move_charge_walk = {
-		.pmd_entry = mem_cgroup_move_charge_pte_range,
-		.mm = mc.mm,
-	};
-
 	lru_add_drain_all();
 	/*
 	 * Signal lock_page_memcg() to take the memcg's move_lock
@@ -5810,7 +5808,8 @@ retry:
 	 * When we have consumed all precharges and failed in doing
 	 * additional charge, the page walk just aborts.
 	 */
-	walk_page_range(0, mc.mm->highest_vm_end, &mem_cgroup_move_charge_walk);
+	walk_page_range(mc.mm, 0, mc.mm->highest_vm_end, &charge_walk_ops,
+			NULL);
 
 	up_read(&mc.mm->mmap_sem);
 	atomic_dec(&mc.from->moving_account);