[PATCH 1/4] mm_notifiers: Rename invalidate_range notifier
Alistair Popple
apopple at nvidia.com
Tue Jul 18 17:56:15 AEST 2023
There are two main use cases for mmu notifiers. One is by KVM which
uses mmu_notifier_invalidate_range_start()/end() to manage a software
TLB.
The other is to manage hardware TLBs which need to use the
invalidate_range() callback because HW can establish new TLB entries
at any time. Hence using start/end() can lead to memory corruption as
these callbacks happen too soon/late during page unmap.
mmu notifier users should therefore either use the start()/end()
callbacks or the invalidate_range() callbacks. To make this usage
clearer rename the invalidate_range() callback to
arch_invalidate_secondary_tlbs() and update documention.
Signed-off-by: Alistair Popple <apopple at nvidia.com>
Suggested-by: Jason Gunthorpe <jgg at nvidia.com>
---
arch/x86/mm/tlb.c | 1 +-
drivers/iommu/amd/iommu_v2.c | 10 +--
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 13 ++--
drivers/iommu/intel/svm.c | 8 +--
drivers/misc/ocxl/link.c | 8 +--
include/asm-generic/tlb.h | 2 +-
include/linux/mmu_notifier.h | 54 +++++++++---------
mm/huge_memory.c | 4 +-
mm/hugetlb.c | 10 +--
mm/mmu_notifier.c | 52 ++++++++++-------
mm/rmap.c | 42 +++++++-------
11 files changed, 110 insertions(+), 94 deletions(-)
diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 267acf2..eaefc10 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -10,6 +10,7 @@
#include <linux/debugfs.h>
#include <linux/sched/smt.h>
#include <linux/task_work.h>
+#include <linux/mmu_notifier.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>
diff --git a/drivers/iommu/amd/iommu_v2.c b/drivers/iommu/amd/iommu_v2.c
index 261352a..2596466 100644
--- a/drivers/iommu/amd/iommu_v2.c
+++ b/drivers/iommu/amd/iommu_v2.c
@@ -355,9 +355,9 @@ static struct pasid_state *mn_to_state(struct mmu_notifier *mn)
return container_of(mn, struct pasid_state, mn);
}
-static void mn_invalidate_range(struct mmu_notifier *mn,
- struct mm_struct *mm,
- unsigned long start, unsigned long end)
+static void mn_arch_invalidate_secondary_tlbs(struct mmu_notifier *mn,
+ struct mm_struct *mm,
+ unsigned long start, unsigned long end)
{
struct pasid_state *pasid_state;
struct device_state *dev_state;
@@ -391,8 +391,8 @@ static void mn_release(struct mmu_notifier *mn, struct mm_struct *mm)
}
static const struct mmu_notifier_ops iommu_mn = {
- .release = mn_release,
- .invalidate_range = mn_invalidate_range,
+ .release = mn_release,
+ .arch_invalidate_secondary_tlbs = mn_arch_invalidate_secondary_tlbs,
};
static void set_pri_tag_status(struct pasid_state *pasid_state,
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
index a5a63b1..aa63cff 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
@@ -186,9 +186,10 @@ static void arm_smmu_free_shared_cd(struct arm_smmu_ctx_desc *cd)
}
}
-static void arm_smmu_mm_invalidate_range(struct mmu_notifier *mn,
- struct mm_struct *mm,
- unsigned long start, unsigned long end)
+static void arm_smmu_mm_arch_invalidate_secondary_tlbs(struct mmu_notifier *mn,
+ struct mm_struct *mm,
+ unsigned long start,
+ unsigned long end)
{
struct arm_smmu_mmu_notifier *smmu_mn = mn_to_smmu(mn);
struct arm_smmu_domain *smmu_domain = smmu_mn->domain;
@@ -237,9 +238,9 @@ static void arm_smmu_mmu_notifier_free(struct mmu_notifier *mn)
}
static const struct mmu_notifier_ops arm_smmu_mmu_notifier_ops = {
- .invalidate_range = arm_smmu_mm_invalidate_range,
- .release = arm_smmu_mm_release,
- .free_notifier = arm_smmu_mmu_notifier_free,
+ .arch_invalidate_secondary_tlbs = arm_smmu_mm_arch_invalidate_secondary_tlbs,
+ .release = arm_smmu_mm_release,
+ .free_notifier = arm_smmu_mmu_notifier_free,
};
/* Allocate or get existing MMU notifier for this {domain, mm} pair */
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index e95b339..8f6d680 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -219,9 +219,9 @@ static void intel_flush_svm_range(struct intel_svm *svm, unsigned long address,
}
/* Pages have been freed at this point */
-static void intel_invalidate_range(struct mmu_notifier *mn,
- struct mm_struct *mm,
- unsigned long start, unsigned long end)
+static void intel_arch_invalidate_secondary_tlbs(struct mmu_notifier *mn,
+ struct mm_struct *mm,
+ unsigned long start, unsigned long end)
{
struct intel_svm *svm = container_of(mn, struct intel_svm, notifier);
@@ -256,7 +256,7 @@ static void intel_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
static const struct mmu_notifier_ops intel_mmuops = {
.release = intel_mm_release,
- .invalidate_range = intel_invalidate_range,
+ .arch_invalidate_secondary_tlbs = intel_arch_invalidate_secondary_tlbs,
};
static DEFINE_MUTEX(pasid_mutex);
diff --git a/drivers/misc/ocxl/link.c b/drivers/misc/ocxl/link.c
index 4cf4c55..c06c699 100644
--- a/drivers/misc/ocxl/link.c
+++ b/drivers/misc/ocxl/link.c
@@ -491,9 +491,9 @@ void ocxl_link_release(struct pci_dev *dev, void *link_handle)
}
EXPORT_SYMBOL_GPL(ocxl_link_release);
-static void invalidate_range(struct mmu_notifier *mn,
- struct mm_struct *mm,
- unsigned long start, unsigned long end)
+static void arch_invalidate_secondary_tlbs(struct mmu_notifier *mn,
+ struct mm_struct *mm,
+ unsigned long start, unsigned long end)
{
struct pe_data *pe_data = container_of(mn, struct pe_data, mmu_notifier);
struct ocxl_link *link = pe_data->link;
@@ -509,7 +509,7 @@ static void invalidate_range(struct mmu_notifier *mn,
}
static const struct mmu_notifier_ops ocxl_mmu_notifier_ops = {
- .invalidate_range = invalidate_range,
+ .arch_invalidate_secondary_tlbs = arch_invalidate_secondary_tlbs,
};
static u64 calculate_cfg_state(bool kernel)
diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
index b466172..48c81b9 100644
--- a/include/asm-generic/tlb.h
+++ b/include/asm-generic/tlb.h
@@ -456,7 +456,7 @@ static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
return;
tlb_flush(tlb);
- mmu_notifier_invalidate_range(tlb->mm, tlb->start, tlb->end);
+ mmu_notifier_invalidate_secondary_tlbs(tlb->mm, tlb->start, tlb->end);
__tlb_reset_range(tlb);
}
diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index 64a3e05..a4bc818 100644
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -187,27 +187,27 @@ struct mmu_notifier_ops {
const struct mmu_notifier_range *range);
/*
- * invalidate_range() is either called between
- * invalidate_range_start() and invalidate_range_end() when the
- * VM has to free pages that where unmapped, but before the
- * pages are actually freed, or outside of _start()/_end() when
- * a (remote) TLB is necessary.
+ * arch_invalidate_secondary_tlbs() is used to manage a non-CPU TLB
+ * which shares page-tables with the CPU. The
+ * invalidate_range_start()/end() callbacks should not be implemented as
+ * invalidate_secondary_tlbs() already catches the points in time when
+ * an external TLB needs to be flushed.
*
- * If invalidate_range() is used to manage a non-CPU TLB with
- * shared page-tables, it not necessary to implement the
- * invalidate_range_start()/end() notifiers, as
- * invalidate_range() already catches the points in time when an
- * external TLB range needs to be flushed. For more in depth
- * discussion on this see Documentation/mm/mmu_notifier.rst
+ * This requires arch_invalidate_secondary_tlbs() to be called while
+ * holding the ptl spin-lock and therefore this callback is not allowed
+ * to sleep.
*
- * Note that this function might be called with just a sub-range
- * of what was passed to invalidate_range_start()/end(), if
- * called between those functions.
+ * This is called by architecture code whenever invalidating a TLB
+ * entry. It is assumed that any secondary TLB has the same rules for
+ * when invalidations are required. If this is not the case architecture
+ * code will need to call this explicitly when required for secondary
+ * TLB invalidation.
*/
- void (*invalidate_range)(struct mmu_notifier *subscription,
- struct mm_struct *mm,
- unsigned long start,
- unsigned long end);
+ void (*arch_invalidate_secondary_tlbs)(
+ struct mmu_notifier *subscription,
+ struct mm_struct *mm,
+ unsigned long start,
+ unsigned long end);
/*
* These callbacks are used with the get/put interface to manage the
@@ -397,8 +397,8 @@ extern void __mmu_notifier_change_pte(struct mm_struct *mm,
extern int __mmu_notifier_invalidate_range_start(struct mmu_notifier_range *r);
extern void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *r,
bool only_end);
-extern void __mmu_notifier_invalidate_range(struct mm_struct *mm,
- unsigned long start, unsigned long end);
+extern void __mmu_notifier_arch_invalidate_secondary_tlbs(struct mm_struct *mm,
+ unsigned long start, unsigned long end);
extern bool
mmu_notifier_range_update_to_read_only(const struct mmu_notifier_range *range);
@@ -491,11 +491,11 @@ mmu_notifier_invalidate_range_only_end(struct mmu_notifier_range *range)
__mmu_notifier_invalidate_range_end(range, true);
}
-static inline void mmu_notifier_invalidate_range(struct mm_struct *mm,
- unsigned long start, unsigned long end)
+static inline void mmu_notifier_arch_invalidate_secondary_tlbs(struct mm_struct *mm,
+ unsigned long start, unsigned long end)
{
if (mm_has_notifiers(mm))
- __mmu_notifier_invalidate_range(mm, start, end);
+ __mmu_notifier_arch_invalidate_secondary_tlbs(mm, start, end);
}
static inline void mmu_notifier_subscriptions_init(struct mm_struct *mm)
@@ -589,7 +589,7 @@ static inline void mmu_notifier_range_init_owner(
pte_t ___pte; \
\
___pte = ptep_clear_flush(__vma, __address, __ptep); \
- mmu_notifier_invalidate_range(___mm, ___addr, \
+ mmu_notifier_arch_invalidate_secondary_tlbs(___mm, ___addr, \
___addr + PAGE_SIZE); \
\
___pte; \
@@ -602,7 +602,7 @@ static inline void mmu_notifier_range_init_owner(
pmd_t ___pmd; \
\
___pmd = pmdp_huge_clear_flush(__vma, __haddr, __pmd); \
- mmu_notifier_invalidate_range(___mm, ___haddr, \
+ mmu_notifier_arch_invalidate_secondary_tlbs(___mm, ___haddr, \
___haddr + HPAGE_PMD_SIZE); \
\
___pmd; \
@@ -615,7 +615,7 @@ static inline void mmu_notifier_range_init_owner(
pud_t ___pud; \
\
___pud = pudp_huge_clear_flush(__vma, __haddr, __pud); \
- mmu_notifier_invalidate_range(___mm, ___haddr, \
+ mmu_notifier_arch_invalidate_secondary_tlbs(___mm, ___haddr, \
___haddr + HPAGE_PUD_SIZE); \
\
___pud; \
@@ -716,7 +716,7 @@ mmu_notifier_invalidate_range_only_end(struct mmu_notifier_range *range)
{
}
-static inline void mmu_notifier_invalidate_range(struct mm_struct *mm,
+static inline void mmu_notifier_arch_invalidate_secondary_tlbs(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
}
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index eb36783..a232891 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2124,8 +2124,8 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
if (is_huge_zero_pmd(*pmd)) {
/*
* FIXME: Do we want to invalidate secondary mmu by calling
- * mmu_notifier_invalidate_range() see comments below inside
- * __split_huge_pmd() ?
+ * mmu_notifier_arch_invalidate_secondary_tlbs() see comments below
+ * inside __split_huge_pmd() ?
*
* We are going from a zero huge page write protected to zero
* small page also write protected so it does not seems useful
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 64a3239..178c930 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -5690,7 +5690,8 @@ static vm_fault_t hugetlb_wp(struct mm_struct *mm, struct vm_area_struct *vma,
/* Break COW or unshare */
huge_ptep_clear_flush(vma, haddr, ptep);
- mmu_notifier_invalidate_range(mm, range.start, range.end);
+ mmu_notifier_arch_invalidate_secondary_tlbs(mm, range.start,
+ range.end);
page_remove_rmap(&old_folio->page, vma, true);
hugepage_add_new_anon_rmap(new_folio, vma, haddr);
if (huge_pte_uffd_wp(pte))
@@ -6822,8 +6823,9 @@ long hugetlb_change_protection(struct vm_area_struct *vma,
else
flush_hugetlb_tlb_range(vma, start, end);
/*
- * No need to call mmu_notifier_invalidate_range() we are downgrading
- * page table protection not changing it to point to a new page.
+ * No need to call mmu_notifier_arch_invalidate_secondary_tlbs() we are
+ * downgrading page table protection not changing it to point to a new
+ * page.
*
* See Documentation/mm/mmu_notifier.rst
*/
@@ -7467,7 +7469,7 @@ static void hugetlb_unshare_pmds(struct vm_area_struct *vma,
i_mmap_unlock_write(vma->vm_file->f_mapping);
hugetlb_vma_unlock_write(vma);
/*
- * No need to call mmu_notifier_invalidate_range(), see
+ * No need to call mmu_notifier_arch_invalidate_secondary_tlbs(), see
* Documentation/mm/mmu_notifier.rst.
*/
mmu_notifier_invalidate_range_end(&range);
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index 50c0dde..34c5a84 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -207,7 +207,7 @@ mmu_interval_read_begin(struct mmu_interval_notifier *interval_sub)
* spin_lock
* seq = ++subscriptions->invalidate_seq
* spin_unlock
- * op->invalidate_range():
+ * op->invalidate_secondary_tlbs():
* user_lock
* mmu_interval_set_seq()
* interval_sub->invalidate_seq = seq
@@ -560,23 +560,23 @@ mn_hlist_invalidate_end(struct mmu_notifier_subscriptions *subscriptions,
hlist_for_each_entry_rcu(subscription, &subscriptions->list, hlist,
srcu_read_lock_held(&srcu)) {
/*
- * Call invalidate_range here too to avoid the need for the
- * subsystem of having to register an invalidate_range_end
- * call-back when there is invalidate_range already. Usually a
- * subsystem registers either invalidate_range_start()/end() or
- * invalidate_range(), so this will be no additional overhead
- * (besides the pointer check).
+ * Subsystems should register either invalidate_secondary_tlbs()
+ * or invalidate_range_start()/end() callbacks.
*
- * We skip call to invalidate_range() if we know it is safe ie
- * call site use mmu_notifier_invalidate_range_only_end() which
- * is safe to do when we know that a call to invalidate_range()
- * already happen under page table lock.
+ * We call invalidate_secondary_tlbs() here so that subsystems
+ * can use larger range based invalidations. In some cases
+ * though invalidate_secondary_tlbs() needs to be called while
+ * holding the page table lock. In that case call sites use
+ * mmu_notifier_invalidate_range_only_end() and we know it is
+ * safe to skip secondary TLB invalidation as it will have
+ * already been done.
*/
- if (!only_end && subscription->ops->invalidate_range)
- subscription->ops->invalidate_range(subscription,
- range->mm,
- range->start,
- range->end);
+ if (!only_end && subscription->ops->invalidate_secondary_tlbs)
+ subscription->ops->invalidate_secondary_tlbs(
+ subscription,
+ range->mm,
+ range->start,
+ range->end);
if (subscription->ops->invalidate_range_end) {
if (!mmu_notifier_range_blockable(range))
non_block_start();
@@ -604,8 +604,8 @@ void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range,
lock_map_release(&__mmu_notifier_invalidate_range_start_map);
}
-void __mmu_notifier_invalidate_range(struct mm_struct *mm,
- unsigned long start, unsigned long end)
+void __mmu_notifier_arch_invalidate_secondary_tlbs(struct mm_struct *mm,
+ unsigned long start, unsigned long end)
{
struct mmu_notifier *subscription;
int id;
@@ -614,9 +614,10 @@ void __mmu_notifier_invalidate_range(struct mm_struct *mm,
hlist_for_each_entry_rcu(subscription,
&mm->notifier_subscriptions->list, hlist,
srcu_read_lock_held(&srcu)) {
- if (subscription->ops->invalidate_range)
- subscription->ops->invalidate_range(subscription, mm,
- start, end);
+ if (subscription->ops->arch_invalidate_secondary_tlbs)
+ subscription->ops->arch_invalidate_secondary_tlbs(
+ subscription, mm,
+ start, end);
}
srcu_read_unlock(&srcu, id);
}
@@ -635,6 +636,15 @@ int __mmu_notifier_register(struct mmu_notifier *subscription,
mmap_assert_write_locked(mm);
BUG_ON(atomic_read(&mm->mm_users) <= 0);
+ /*
+ * Subsystems should only register for invalidate_secondary_tlbs() or
+ * invalidate_range_start()/end() callbacks, not both.
+ */
+ if (WARN_ON_ONCE(subscription->ops->arch_invalidate_secondary_tlbs &&
+ (subscription->ops->invalidate_range_start ||
+ subscription->ops->invalidate_range_end)))
+ return -EINVAL;
+
if (!mm->notifier_subscriptions) {
/*
* kmalloc cannot be called under mm_take_all_locks(), but we
diff --git a/mm/rmap.c b/mm/rmap.c
index 0c0d885..b74fc2c 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -991,9 +991,9 @@ static int page_vma_mkclean_one(struct page_vma_mapped_walk *pvmw)
}
/*
- * No need to call mmu_notifier_invalidate_range() as we are
- * downgrading page table protection not changing it to point
- * to a new page.
+ * No need to call mmu_notifier_arch_invalidate_secondary_tlbs() as
+ * we are downgrading page table protection not changing it to
+ * point to a new page.
*
* See Documentation/mm/mmu_notifier.rst
*/
@@ -1554,8 +1554,8 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
hugetlb_vma_unlock_write(vma);
flush_tlb_range(vma,
range.start, range.end);
- mmu_notifier_invalidate_range(mm,
- range.start, range.end);
+ mmu_notifier_arch_invalidate_secondary_tlbs(
+ mm, range.start, range.end);
/*
* The ref count of the PMD page was
* dropped which is part of the way map
@@ -1629,7 +1629,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
*/
dec_mm_counter(mm, mm_counter(&folio->page));
/* We have to invalidate as we cleared the pte */
- mmu_notifier_invalidate_range(mm, address,
+ mmu_notifier_arch_invalidate_secondary_tlbs(mm, address,
address + PAGE_SIZE);
} else if (folio_test_anon(folio)) {
swp_entry_t entry = { .val = page_private(subpage) };
@@ -1643,7 +1643,8 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
WARN_ON_ONCE(1);
ret = false;
/* We have to invalidate as we cleared the pte */
- mmu_notifier_invalidate_range(mm, address,
+ mmu_notifier_arch_invalidate_secondary_tlbs(mm,
+ address,
address + PAGE_SIZE);
page_vma_mapped_walk_done(&pvmw);
break;
@@ -1676,8 +1677,9 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
if (ref_count == 1 + map_count &&
!folio_test_dirty(folio)) {
/* Invalidate as we cleared the pte */
- mmu_notifier_invalidate_range(mm,
- address, address + PAGE_SIZE);
+ mmu_notifier_arch_invalidate_secondary_tlbs(
+ mm, address,
+ address + PAGE_SIZE);
dec_mm_counter(mm, MM_ANONPAGES);
goto discard;
}
@@ -1733,7 +1735,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
swp_pte = pte_swp_mkuffd_wp(swp_pte);
set_pte_at(mm, address, pvmw.pte, swp_pte);
/* Invalidate as we cleared the pte */
- mmu_notifier_invalidate_range(mm, address,
+ mmu_notifier_arch_invalidate_secondary_tlbs(mm, address,
address + PAGE_SIZE);
} else {
/*
@@ -1751,9 +1753,9 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
}
discard:
/*
- * No need to call mmu_notifier_invalidate_range() it has be
- * done above for all cases requiring it to happen under page
- * table lock before mmu_notifier_invalidate_range_end()
+ * No need to call mmu_notifier_arch_invalidate_secondary_tlbs() it
+ * has be done above for all cases requiring it to happen under
+ * page table lock before mmu_notifier_invalidate_range_end()
*
* See Documentation/mm/mmu_notifier.rst
*/
@@ -1935,8 +1937,8 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma,
hugetlb_vma_unlock_write(vma);
flush_tlb_range(vma,
range.start, range.end);
- mmu_notifier_invalidate_range(mm,
- range.start, range.end);
+ mmu_notifier_arch_invalidate_secondary_tlbs(
+ mm, range.start, range.end);
/*
* The ref count of the PMD page was
@@ -2042,8 +2044,8 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma,
*/
dec_mm_counter(mm, mm_counter(&folio->page));
/* We have to invalidate as we cleared the pte */
- mmu_notifier_invalidate_range(mm, address,
- address + PAGE_SIZE);
+ mmu_notifier_arch_invalidate_secondary_tlbs(mm, address,
+ address + PAGE_SIZE);
} else {
swp_entry_t entry;
pte_t swp_pte;
@@ -2108,9 +2110,9 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma,
}
/*
- * No need to call mmu_notifier_invalidate_range() it has be
- * done above for all cases requiring it to happen under page
- * table lock before mmu_notifier_invalidate_range_end()
+ * No need to call mmu_notifier_arch_invalidate_secondary_tlbs() it
+ * has be done above for all cases requiring it to happen under
+ * page table lock before mmu_notifier_invalidate_range_end()
*
* See Documentation/mm/mmu_notifier.rst
*/
--
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