[PATCH v2 2/3] mm/mmu_notifier: use structure for invalidate_range_start/end calls v2

jglisse
2018-12-05T05:36:27Z

From: Jérôme Glisse <jglisse@redhat.com>

To avoid having to change many call sites everytime we want to add a
parameter use a structure to group all parameters for the mmu_notifier
invalidate_range_start/end cakks. No functional changes with this
patch.

Changes since v1:
- introduce mmu_notifier_range_init() as an helper to initialize
the range structure allowing to optimize out the case when mmu
notifier is not enabled
- fix mm/migrate.c migrate_vma_collect()

Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Acked-by: Christian König <christian.koenig@amd.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Ross Zwisler <zwisler@kernel.org>
Cc: Jan Kara <jack@suse.cz>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Felix Kuehling <felix.kuehling@amd.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: kvm@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-rdma@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
---
fs/dax.c | 8 +--
fs/proc/task_mmu.c | 7 ++-
include/linux/mm.h | 4 +-
include/linux/mmu_notifier.h | 87 +++++++++++++++++++++-----------
kernel/events/uprobes.c | 10 ++--
mm/huge_memory.c | 54 ++++++++++----------
mm/hugetlb.c | 52 ++++++++++---------
mm/khugepaged.c | 10 ++--
mm/ksm.c | 21 ++++----
mm/madvise.c | 21 ++++----
mm/memory.c | 97 ++++++++++++++++++------------------
mm/migrate.c | 25 +++++-----
mm/mmu_notifier.c | 35 +++----------
mm/mprotect.c | 15 +++---
mm/mremap.c | 10 ++--
mm/oom_kill.c | 17 ++++---
mm/rmap.c | 30 ++++++-----
17 files changed, 258 insertions(+), 245 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index 9bcce89ea18e..874085bacaf5 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -758,7 +758,8 @@ static void dax_entry_mkclean(struct address_space *mapping, pgoff_t index,

i_mmap_lock_read(mapping);
vma_interval_tree_foreach(vma, &mapping->i_mmap, index, index) {
- unsigned long address, start, end;
+ struct mmu_notifier_range range;
+ unsigned long address;

cond_resched();

@@ -772,7 +773,8 @@ static void dax_entry_mkclean(struct address_space *mapping, pgoff_t index,
* call mmu_notifier_invalidate_range_start() on our behalf
* before taking any lock.
*/
- if (follow_pte_pmd(vma->vm_mm, address, &start, &end, &ptep, &pmdp, &ptl))
+ if (follow_pte_pmd(vma->vm_mm, address, &range,
+ &ptep, &pmdp, &ptl))
continue;

/*
@@ -814,7 +816,7 @@ static void dax_entry_mkclean(struct address_space *mapping, pgoff_t index,
pte_unmap_unlock(ptep, ptl);
}

- mmu_notifier_invalidate_range_end(vma->vm_mm, start, end);
+ mmu_notifier_invalidate_range_end(&range);
}
i_mmap_unlock_read(mapping);
}
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 47c3764c469b..b3ddceb003bc 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1096,6 +1096,7 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
return -ESRCH;
mm = get_task_mm(task);
if (mm) {
+ struct mmu_notifier_range range;
struct clear_refs_private cp = {
.type = type,
};
@@ -1139,11 +1140,13 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
downgrade_write(&mm->mmap_sem);
break;
}
- mmu_notifier_invalidate_range_start(mm, 0, -1);
+
+ mmu_notifier_range_init(&range, mm, 0, -1UL);
+ mmu_notifier_invalidate_range_start(&range);
}
walk_page_range(0, mm->highest_vm_end, &clear_refs_walk);
if (type == CLEAR_REFS_SOFT_DIRTY)
- mmu_notifier_invalidate_range_end(mm, 0, -1);
+ mmu_notifier_invalidate_range_end(&range);
tlb_finish_mmu(&tlb, 0, -1);
up_read(&mm->mmap_sem);
out_mm:
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5411de93a363..e7b6f2b30713 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1397,6 +1397,8 @@ struct mm_walk {
void *private;
};

+struct mmu_notifier_range;
+
int walk_page_range(unsigned long addr, unsigned long end,
struct mm_walk *walk);
int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk);
@@ -1405,7 +1407,7 @@ void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
struct vm_area_struct *vma);
int follow_pte_pmd(struct mm_struct *mm, unsigned long address,
- unsigned long *start, unsigned long *end,
+ struct mmu_notifier_range *range,
pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp);
int follow_pfn(struct vm_area_struct *vma, unsigned long address,
unsigned long *pfn);
diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index 368f0c1a049d..39b06772427f 100644
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -220,11 +220,8 @@ extern int __mmu_notifier_test_young(struct mm_struct *mm,
unsigned long address);
extern void __mmu_notifier_change_pte(struct mm_struct *mm,
unsigned long address, pte_t pte);
-extern int __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
- unsigned long start, unsigned long end,
- bool blockable);
-extern void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
- unsigned long start, unsigned long end,
+extern int __mmu_notifier_invalidate_range_start(struct mmu_notifier_range *);
+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);
@@ -268,33 +265,37 @@ static inline void mmu_notifier_change_pte(struct mm_struct *mm,
__mmu_notifier_change_pte(mm, address, pte);
}

-static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm,
- unsigned long start, unsigned long end)
+static inline void
+mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range)
{
- if (mm_has_notifiers(mm))
- __mmu_notifier_invalidate_range_start(mm, start, end, true);
+ if (mm_has_notifiers(range->mm)) {
+ range->blockable = true;
+ __mmu_notifier_invalidate_range_start(range);
+ }
}

-static inline int mmu_notifier_invalidate_range_start_nonblock(struct mm_struct *mm,
- unsigned long start, unsigned long end)
+static inline int
+mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range)
{
- if (mm_has_notifiers(mm))
- return __mmu_notifier_invalidate_range_start(mm, start, end, false);
+ if (mm_has_notifiers(range->mm)) {
+ range->blockable = false;
+ return __mmu_notifier_invalidate_range_start(range);
+ }
return 0;
}

-static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm,
- unsigned long start, unsigned long end)
+static inline void
+mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range)
{
- if (mm_has_notifiers(mm))
- __mmu_notifier_invalidate_range_end(mm, start, end, false);
+ if (mm_has_notifiers(range->mm))
+ __mmu_notifier_invalidate_range_end(range, false);
}

-static inline void mmu_notifier_invalidate_range_only_end(struct mm_struct *mm,
- unsigned long start, unsigned long end)
+static inline void
+mmu_notifier_invalidate_range_only_end(struct mmu_notifier_range *range)
{
- if (mm_has_notifiers(mm))
- __mmu_notifier_invalidate_range_end(mm, start, end, true);
+ if (mm_has_notifiers(range->mm))
+ __mmu_notifier_invalidate_range_end(range, true);
}

static inline void mmu_notifier_invalidate_range(struct mm_struct *mm,
@@ -315,6 +316,17 @@ static inline void mmu_notifier_mm_destroy(struct mm_struct *mm)
__mmu_notifier_mm_destroy(mm);
}

+
+static inline void mmu_notifier_range_init(struct mmu_notifier_range *range,
+ struct mm_struct *mm,
+ unsigned long start,
+ unsigned long end)
+{
+ range->mm = mm;
+ range->start = start;
+ range->end = end;
+}
+
#define ptep_clear_flush_young_notify(__vma, __address, __ptep) \
({ \
int __young; \
@@ -428,6 +440,23 @@ extern void mmu_notifier_synchronize(void);

#else /* CONFIG_MMU_NOTIFIER */

+struct mmu_notifier_range {
+ unsigned long start;
+ unsigned long end;
+};
+
+static inline void _mmu_notifier_range_init(struct mmu_notifier_range *range,
+ unsigned long start,
+ unsigned long end)
+{
+ range->start = start;
+ range->end = end;
+}
+
+#define mmu_notifier_range_init(range, mm, start, end) \
+ _mmu_notifier_range_init(range, start, end)
+
+
static inline int mm_has_notifiers(struct mm_struct *mm)
{
return 0;
@@ -455,24 +484,24 @@ static inline void mmu_notifier_change_pte(struct mm_struct *mm,
{
}

-static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm,
- unsigned long start, unsigned long end)
+static inline void
+mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range)
{
}

-static inline int mmu_notifier_invalidate_range_start_nonblock(struct mm_struct *mm,
- unsigned long start, unsigned long end)
+static inline int
+mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range)
{
return 0;
}

-static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm,
- unsigned long start, unsigned long end)
+static inline
+void mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range)
{
}

-static inline void mmu_notifier_invalidate_range_only_end(struct mm_struct *mm,
- unsigned long start, unsigned long end)
+static inline void
+mmu_notifier_invalidate_range_only_end(struct mmu_notifier_range *range)
{
}

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 322e97bbb437..1fc8a93709c3 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -171,11 +171,11 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
.address = addr,
};
int err;
- /* For mmu_notifiers */
- const unsigned long mmun_start = addr;
- const unsigned long mmun_end = addr + PAGE_SIZE;
+ struct mmu_notifier_range range;
struct mem_cgroup *memcg;

+ mmu_notifier_range_init(&range, mm, addr, addr + PAGE_SIZE);
+
VM_BUG_ON_PAGE(PageTransHuge(old_page), old_page);

err = mem_cgroup_try_charge(new_page, vma->vm_mm, GFP_KERNEL, &memcg,
@@ -186,7 +186,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
/* For try_to_free_swap() and munlock_vma_page() below */
lock_page(old_page);

- mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_start(&range);
err = -EAGAIN;
if (!page_vma_mapped_walk(&pvmw)) {
mem_cgroup_cancel_charge(new_page, memcg, false);
@@ -220,7 +220,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,

err = 0;
unlock:
- mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_end(&range);
unlock_page(old_page);
return err;
}
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 622cced74fd9..c1d3ce809416 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1144,8 +1144,7 @@ static vm_fault_t do_huge_pmd_wp_page_fallback(struct vm_fault *vmf,
int i;
vm_fault_t ret = 0;
struct page **pages;
- unsigned long mmun_start; /* For mmu_notifiers */
- unsigned long mmun_end; /* For mmu_notifiers */
+ struct mmu_notifier_range range;

pages = kmalloc_array(HPAGE_PMD_NR, sizeof(struct page *),
GFP_KERNEL);
@@ -1183,9 +1182,9 @@ static vm_fault_t do_huge_pmd_wp_page_fallback(struct vm_fault *vmf,
cond_resched();
}

- mmun_start = haddr;
- mmun_end = haddr + HPAGE_PMD_SIZE;
- mmu_notifier_invalidate_range_start(vma->vm_mm, mmun_start, mmun_end);
+ mmu_notifier_range_init(&range, vma->vm_mm, haddr,
+ haddr + HPAGE_PMD_SIZE);
+ mmu_notifier_invalidate_range_start(&range);

vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd);
if (unlikely(!pmd_same(*vmf->pmd, orig_pmd)))
@@ -1230,8 +1229,7 @@ static vm_fault_t do_huge_pmd_wp_page_fallback(struct vm_fault *vmf,
* No need to double call mmu_notifier->invalidate_range() callback as
* the above pmdp_huge_clear_flush_notify() did already call it.
*/
- mmu_notifier_invalidate_range_only_end(vma->vm_mm, mmun_start,
- mmun_end);
+ mmu_notifier_invalidate_range_only_end(&range);

ret |= VM_FAULT_WRITE;
put_page(page);
@@ -1241,7 +1239,7 @@ static vm_fault_t do_huge_pmd_wp_page_fallback(struct vm_fault *vmf,

out_free_pages:
spin_unlock(vmf->ptl);
- mmu_notifier_invalidate_range_end(vma->vm_mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_end(&range);
for (i = 0; i < HPAGE_PMD_NR; i++) {
memcg = (void *)page_private(pages[i]);
set_page_private(pages[i], 0);
@@ -1258,8 +1256,7 @@ vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd)
struct page *page = NULL, *new_page;
struct mem_cgroup *memcg;
unsigned long haddr = vmf->address & HPAGE_PMD_MASK;
- unsigned long mmun_start; /* For mmu_notifiers */
- unsigned long mmun_end; /* For mmu_notifiers */
+ struct mmu_notifier_range range;
gfp_t huge_gfp; /* for allocation and charge */
vm_fault_t ret = 0;

@@ -1349,9 +1346,9 @@ vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd)
vma, HPAGE_PMD_NR);
__SetPageUptodate(new_page);

- mmun_start = haddr;
- mmun_end = haddr + HPAGE_PMD_SIZE;
- mmu_notifier_invalidate_range_start(vma->vm_mm, mmun_start, mmun_end);
+ mmu_notifier_range_init(&range, vma->vm_mm, haddr,
+ haddr + HPAGE_PMD_SIZE);
+ mmu_notifier_invalidate_range_start(&range);

spin_lock(vmf->ptl);
if (page)
@@ -1386,8 +1383,7 @@ vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd)
* No need to double call mmu_notifier->invalidate_range() callback as
* the above pmdp_huge_clear_flush_notify() did already call it.
*/
- mmu_notifier_invalidate_range_only_end(vma->vm_mm, mmun_start,
- mmun_end);
+ mmu_notifier_invalidate_range_only_end(&range);
out:
return ret;
out_unlock:
@@ -2028,14 +2024,15 @@ void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
unsigned long address)
{
spinlock_t *ptl;
- struct mm_struct *mm = vma->vm_mm;
- unsigned long haddr = address & HPAGE_PUD_MASK;
+ struct mmu_notifier_range range;

- mmu_notifier_invalidate_range_start(mm, haddr, haddr + HPAGE_PUD_SIZE);
- ptl = pud_lock(mm, pud);
+ mmu_notifier_range_init(&range, vma->vm_mm, address & HPAGE_PUD_MASK,
+ (address & HPAGE_PUD_MASK) + HPAGE_PUD_SIZE);
+ mmu_notifier_invalidate_range_start(&range);
+ ptl = pud_lock(vma->vm_mm, pud);
if (unlikely(!pud_trans_huge(*pud) && !pud_devmap(*pud)))
goto out;
- __split_huge_pud_locked(vma, pud, haddr);
+ __split_huge_pud_locked(vma, pud, range.start);

out:
spin_unlock(ptl);
@@ -2043,8 +2040,7 @@ void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
* No need to double call mmu_notifier->invalidate_range() callback as
* the above pudp_huge_clear_flush_notify() did already call it.
*/
- mmu_notifier_invalidate_range_only_end(mm, haddr, haddr +
- HPAGE_PUD_SIZE);
+ mmu_notifier_invalidate_range_only_end(&range);
}
#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */

@@ -2244,11 +2240,12 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long address, bool freeze, struct page *page)
{
spinlock_t *ptl;
- struct mm_struct *mm = vma->vm_mm;
- unsigned long haddr = address & HPAGE_PMD_MASK;
+ struct mmu_notifier_range range;

- mmu_notifier_invalidate_range_start(mm, haddr, haddr + HPAGE_PMD_SIZE);
- ptl = pmd_lock(mm, pmd);
+ mmu_notifier_range_init(&range, vma->vm_mm, address & HPAGE_PMD_MASK,
+ (address & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE);
+ mmu_notifier_invalidate_range_start(&range);
+ ptl = pmd_lock(vma->vm_mm, pmd);

/*
* If caller asks to setup a migration entries, we need a page to check
@@ -2264,7 +2261,7 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
clear_page_mlock(page);
} else if (!(pmd_devmap(*pmd) || is_pmd_migration_entry(*pmd)))
goto out;
- __split_huge_pmd_locked(vma, pmd, haddr, freeze);
+ __split_huge_pmd_locked(vma, pmd, range.start, freeze);
out:
spin_unlock(ptl);
/*
@@ -2280,8 +2277,7 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
* any further changes to individual pte will notify. So no need
* to call mmu_notifier->invalidate_range()
*/
- mmu_notifier_invalidate_range_only_end(mm, haddr, haddr +
- HPAGE_PMD_SIZE);
+ mmu_notifier_invalidate_range_only_end(&range);
}

void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 705a3e9cc910..e7c179cbcd75 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3239,16 +3239,16 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
int cow;
struct hstate *h = hstate_vma(vma);
unsigned long sz = huge_page_size(h);
- unsigned long mmun_start; /* For mmu_notifiers */
- unsigned long mmun_end; /* For mmu_notifiers */
+ struct mmu_notifier_range range;
int ret = 0;

cow = (vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;

- mmun_start = vma->vm_start;
- mmun_end = vma->vm_end;
- if (cow)
- mmu_notifier_invalidate_range_start(src, mmun_start, mmun_end);
+ if (cow) {
+ mmu_notifier_range_init(&range, src, vma->vm_start,
+ vma->vm_end);
+ mmu_notifier_invalidate_range_start(&range);
+ }

for (addr = vma->vm_start; addr < vma->vm_end; addr += sz) {
spinlock_t *src_ptl, *dst_ptl;
@@ -3324,7 +3324,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
}

if (cow)
- mmu_notifier_invalidate_range_end(src, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_end(&range);

return ret;
}
@@ -3341,8 +3341,7 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
struct page *page;
struct hstate *h = hstate_vma(vma);
unsigned long sz = huge_page_size(h);
- unsigned long mmun_start = start; /* For mmu_notifiers */
- unsigned long mmun_end = end; /* For mmu_notifiers */
+ struct mmu_notifier_range range;

WARN_ON(!is_vm_hugetlb_page(vma));
BUG_ON(start & ~huge_page_mask(h));
@@ -3358,8 +3357,9 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
/*
* If sharing possible, alert mmu notifiers of worst case.
*/
- adjust_range_if_pmd_sharing_possible(vma, &mmun_start, &mmun_end);
- mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
+ mmu_notifier_range_init(&range, mm, start, end);
+ adjust_range_if_pmd_sharing_possible(vma, &range.start, &range.end);
+ mmu_notifier_invalidate_range_start(&range);
address = start;
for (; address < end; address += sz) {
ptep = huge_pte_offset(mm, address, sz);
@@ -3427,7 +3427,7 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
if (ref_page)
break;
}
- mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_end(&range);
tlb_end_vma(tlb, vma);
}

@@ -3545,9 +3545,8 @@ static vm_fault_t hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
struct page *old_page, *new_page;
int outside_reserve = 0;
vm_fault_t ret = 0;
- unsigned long mmun_start; /* For mmu_notifiers */
- unsigned long mmun_end; /* For mmu_notifiers */
unsigned long haddr = address & huge_page_mask(h);
+ struct mmu_notifier_range range;

pte = huge_ptep_get(ptep);
old_page = pte_page(pte);
@@ -3626,9 +3625,8 @@ static vm_fault_t hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
__SetPageUptodate(new_page);
set_page_huge_active(new_page);

- mmun_start = haddr;
- mmun_end = mmun_start + huge_page_size(h);
- mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
+ mmu_notifier_range_init(&range, mm, haddr, haddr + huge_page_size(h));
+ mmu_notifier_invalidate_range_start(&range);

/*
* Retake the page table lock to check for racing updates
@@ -3641,7 +3639,7 @@ static vm_fault_t hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,

/* Break COW */
huge_ptep_clear_flush(vma, haddr, ptep);
- mmu_notifier_invalidate_range(mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range(mm, range.start, range.end);
set_huge_pte_at(mm, haddr, ptep,
make_huge_pte(vma, new_page, 1));
page_remove_rmap(old_page, true);
@@ -3650,7 +3648,7 @@ static vm_fault_t hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
new_page = old_page;
}
spin_unlock(ptl);
- mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_end(&range);
out_release_all:
restore_reserve_on_error(h, vma, haddr, new_page);
put_page(new_page);
@@ -4339,21 +4337,21 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
pte_t pte;
struct hstate *h = hstate_vma(vma);
unsigned long pages = 0;
- unsigned long f_start = start;
- unsigned long f_end = end;
bool shared_pmd = false;
+ struct mmu_notifier_range range;

/*
* In the case of shared PMDs, the area to flush could be beyond
- * start/end. Set f_start/f_end to cover the maximum possible
+ * start/end. Set range.start/range.end to cover the maximum possible
* range if PMD sharing is possible.
*/
- adjust_range_if_pmd_sharing_possible(vma, &f_start, &f_end);
+ mmu_notifier_range_init(&range, mm, start, end);
+ adjust_range_if_pmd_sharing_possible(vma, &range.start, &range.end);

BUG_ON(address >= end);
- flush_cache_range(vma, f_start, f_end);
+ flush_cache_range(vma, range.start, range.end);

- mmu_notifier_invalidate_range_start(mm, f_start, f_end);
+ mmu_notifier_invalidate_range_start(&range);
i_mmap_lock_write(vma->vm_file->f_mapping);
for (; address < end; address += huge_page_size(h)) {
spinlock_t *ptl;
@@ -4404,7 +4402,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
* did unshare a page of pmds, flush the range corresponding to the pud.
*/
if (shared_pmd)
- flush_hugetlb_tlb_range(vma, f_start, f_end);
+ flush_hugetlb_tlb_range(vma, range.start, range.end);
else
flush_hugetlb_tlb_range(vma, start, end);
/*
@@ -4414,7 +4412,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
* See Documentation/vm/mmu_notifier.rst
*/
i_mmap_unlock_write(vma->vm_file->f_mapping);
- mmu_notifier_invalidate_range_end(mm, f_start, f_end);
+ mmu_notifier_invalidate_range_end(&range);

return pages << h->order;
}
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 8e2ff195ecb3..7736f6c37f19 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -944,8 +944,7 @@ static void collapse_huge_page(struct mm_struct *mm,
int isolated = 0, result = 0;
struct mem_cgroup *memcg;
struct vm_area_struct *vma;
- unsigned long mmun_start; /* For mmu_notifiers */
- unsigned long mmun_end; /* For mmu_notifiers */
+ struct mmu_notifier_range range;
gfp_t gfp;

VM_BUG_ON(address & ~HPAGE_PMD_MASK);
@@ -1017,9 +1016,8 @@ static void collapse_huge_page(struct mm_struct *mm,
pte = pte_offset_map(pmd, address);
pte_ptl = pte_lockptr(mm, pmd);

- mmun_start = address;
- mmun_end = address + HPAGE_PMD_SIZE;
- mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
+ mmu_notifier_range_init(&range, mm, address, address + HPAGE_PMD_SIZE);
+ mmu_notifier_invalidate_range_start(&range);
pmd_ptl = pmd_lock(mm, pmd); /* probably unnecessary */
/*
* After this gup_fast can't run anymore. This also removes
@@ -1029,7 +1027,7 @@ static void collapse_huge_page(struct mm_struct *mm,
*/
_pmd = pmdp_collapse_flush(vma, address, pmd);
spin_unlock(pmd_ptl);
- mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_end(&range);

spin_lock(pte_ptl);
isolated = __collapse_huge_page_isolate(vma, address, pte);
diff --git a/mm/ksm.c b/mm/ksm.c
index 5b0894b45ee5..6239d2df7a8e 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1042,8 +1042,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
};
int swapped;
int err = -EFAULT;
- unsigned long mmun_start; /* For mmu_notifiers */
- unsigned long mmun_end; /* For mmu_notifiers */
+ struct mmu_notifier_range range;

pvmw.address = page_address_in_vma(page, vma);
if (pvmw.address == -EFAULT)
@@ -1051,9 +1050,9 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,

BUG_ON(PageTransCompound(page));

- mmun_start = pvmw.address;
- mmun_end = pvmw.address + PAGE_SIZE;
- mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
+ mmu_notifier_range_init(&range, mm, pvmw.address,
+ pvmw.address + PAGE_SIZE);
+ mmu_notifier_invalidate_range_start(&range);

if (!page_vma_mapped_walk(&pvmw))
goto out_mn;
@@ -1105,7 +1104,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
out_unlock:
page_vma_mapped_walk_done(&pvmw);
out_mn:
- mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_end(&range);
out:
return err;
}
@@ -1129,8 +1128,7 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
spinlock_t *ptl;
unsigned long addr;
int err = -EFAULT;
- unsigned long mmun_start; /* For mmu_notifiers */
- unsigned long mmun_end; /* For mmu_notifiers */
+ struct mmu_notifier_range range;

addr = page_address_in_vma(page, vma);
if (addr == -EFAULT)
@@ -1140,9 +1138,8 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
if (!pmd)
goto out;

- mmun_start = addr;
- mmun_end = addr + PAGE_SIZE;
- mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
+ mmu_notifier_range_init(&range, mm, addr, addr + PAGE_SIZE);
+ mmu_notifier_invalidate_range_start(&range);

ptep = pte_offset_map_lock(mm, pmd, addr, &ptl);
if (!pte_same(*ptep, orig_pte)) {
@@ -1188,7 +1185,7 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
pte_unmap_unlock(ptep, ptl);
err = 0;
out_mn:
- mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_end(&range);
out:
return err;
}
diff --git a/mm/madvise.c b/mm/madvise.c
index 6cb1ca93e290..21a7881a2db4 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -458,29 +458,30 @@ static void madvise_free_page_range(struct mmu_gather *tlb,
static int madvise_free_single_vma(struct vm_area_struct *vma,
unsigned long start_addr, unsigned long end_addr)
{
- unsigned long start, end;
struct mm_struct *mm = vma->vm_mm;
+ struct mmu_notifier_range range;
struct mmu_gather tlb;

/* MADV_FREE works for only anon vma at the moment */
if (!vma_is_anonymous(vma))
return -EINVAL;

- start = max(vma->vm_start, start_addr);
- if (start >= vma->vm_end)
+ range.start = max(vma->vm_start, start_addr);
+ if (range.start >= vma->vm_end)
return -EINVAL;
- end = min(vma->vm_end, end_addr);
- if (end <= vma->vm_start)
+ range.end = min(vma->vm_end, end_addr);
+ if (range.end <= vma->vm_start)
return -EINVAL;
+ mmu_notifier_range_init(&range, mm, range.start, range.end);

lru_add_drain();
- tlb_gather_mmu(&tlb, mm, start, end);
+ tlb_gather_mmu(&tlb, mm, range.start, range.end);
update_hiwater_rss(mm);

- mmu_notifier_invalidate_range_start(mm, start, end);
- madvise_free_page_range(&tlb, vma, start, end);
- mmu_notifier_invalidate_range_end(mm, start, end);
- tlb_finish_mmu(&tlb, start, end);
+ mmu_notifier_invalidate_range_start(&range);
+ madvise_free_page_range(&tlb, vma, range.start, range.end);
+ mmu_notifier_invalidate_range_end(&range);
+ tlb_finish_mmu(&tlb, range.start, range.end);

return 0;
}
diff --git a/mm/memory.c b/mm/memory.c
index 4ad2d293ddc2..574307f11464 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -973,8 +973,7 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
unsigned long next;
unsigned long addr = vma->vm_start;
unsigned long end = vma->vm_end;
- unsigned long mmun_start; /* For mmu_notifiers */
- unsigned long mmun_end; /* For mmu_notifiers */
+ struct mmu_notifier_range range;
bool is_cow;
int ret;

@@ -1008,11 +1007,11 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
* is_cow_mapping() returns true.
*/
is_cow = is_cow_mapping(vma->vm_flags);
- mmun_start = addr;
- mmun_end = end;
- if (is_cow)
- mmu_notifier_invalidate_range_start(src_mm, mmun_start,
- mmun_end);
+
+ if (is_cow) {
+ mmu_notifier_range_init(&range, src_mm, addr, end);
+ mmu_notifier_invalidate_range_start(&range);
+ }

ret = 0;
dst_pgd = pgd_offset(dst_mm, addr);
@@ -1029,7 +1028,7 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
} while (dst_pgd++, src_pgd++, addr = next, addr != end);

if (is_cow)
- mmu_notifier_invalidate_range_end(src_mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_end(&range);
return ret;
}

@@ -1332,12 +1331,13 @@ void unmap_vmas(struct mmu_gather *tlb,
struct vm_area_struct *vma, unsigned long start_addr,
unsigned long end_addr)
{
- struct mm_struct *mm = vma->vm_mm;
+ struct mmu_notifier_range range;

- mmu_notifier_invalidate_range_start(mm, start_addr, end_addr);
+ mmu_notifier_range_init(&range, vma->vm_mm, start_addr, end_addr);
+ mmu_notifier_invalidate_range_start(&range);
for ( ; vma && vma->vm_start < end_addr; vma = vma->vm_next)
unmap_single_vma(tlb, vma, start_addr, end_addr, NULL);
- mmu_notifier_invalidate_range_end(mm, start_addr, end_addr);
+ mmu_notifier_invalidate_range_end(&range);
}

/**
@@ -1351,18 +1351,18 @@ void unmap_vmas(struct mmu_gather *tlb,
void zap_page_range(struct vm_area_struct *vma, unsigned long start,
unsigned long size)
{
- struct mm_struct *mm = vma->vm_mm;
+ struct mmu_notifier_range range;
struct mmu_gather tlb;
- unsigned long end = start + size;

lru_add_drain();
- tlb_gather_mmu(&tlb, mm, start, end);
- update_hiwater_rss(mm);
- mmu_notifier_invalidate_range_start(mm, start, end);
- for ( ; vma && vma->vm_start < end; vma = vma->vm_next)
- unmap_single_vma(&tlb, vma, start, end, NULL);
- mmu_notifier_invalidate_range_end(mm, start, end);
- tlb_finish_mmu(&tlb, start, end);
+ mmu_notifier_range_init(&range, vma->vm_mm, start, start + size);
+ tlb_gather_mmu(&tlb, vma->vm_mm, start, range.end);
+ update_hiwater_rss(vma->vm_mm);
+ mmu_notifier_invalidate_range_start(&range);
+ for ( ; vma && vma->vm_start < range.end; vma = vma->vm_next)
+ unmap_single_vma(&tlb, vma, start, range.end, NULL);
+ mmu_notifier_invalidate_range_end(&range);
+ tlb_finish_mmu(&tlb, start, range.end);
}

/**
@@ -1377,17 +1377,17 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long start,
static void zap_page_range_single(struct vm_area_struct *vma, unsigned long address,
unsigned long size, struct zap_details *details)
{
- struct mm_struct *mm = vma->vm_mm;
+ struct mmu_notifier_range range;
struct mmu_gather tlb;
- unsigned long end = address + size;

lru_add_drain();
- tlb_gather_mmu(&tlb, mm, address, end);
- update_hiwater_rss(mm);
- mmu_notifier_invalidate_range_start(mm, address, end);
- unmap_single_vma(&tlb, vma, address, end, details);
- mmu_notifier_invalidate_range_end(mm, address, end);
- tlb_finish_mmu(&tlb, address, end);
+ mmu_notifier_range_init(&range, vma->vm_mm, address, address + size);
+ tlb_gather_mmu(&tlb, vma->vm_mm, address, range.end);
+ update_hiwater_rss(vma->vm_mm);
+ mmu_notifier_invalidate_range_start(&range);
+ unmap_single_vma(&tlb, vma, address, range.end, details);
+ mmu_notifier_invalidate_range_end(&range);
+ tlb_finish_mmu(&tlb, address, range.end);
}

/**
@@ -2247,9 +2247,8 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
struct page *new_page = NULL;
pte_t entry;
int page_copied = 0;
- const unsigned long mmun_start = vmf->address & PAGE_MASK;
- const unsigned long mmun_end = mmun_start + PAGE_SIZE;
struct mem_cgroup *memcg;
+ struct mmu_notifier_range range;

if (unlikely(anon_vma_prepare(vma)))
goto oom;
@@ -2272,7 +2271,9 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)

__SetPageUptodate(new_page);

- mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
+ mmu_notifier_range_init(&range, mm, vmf->address & PAGE_MASK,
+ (vmf->address & PAGE_MASK) + PAGE_SIZE);
+ mmu_notifier_invalidate_range_start(&range);

/*
* Re-check the pte - we dropped the lock
@@ -2349,7 +2350,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
* No need to double call mmu_notifier->invalidate_range() callback as
* the above ptep_clear_flush_notify() did already call it.
*/
- mmu_notifier_invalidate_range_only_end(mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_only_end(&range);
if (old_page) {
/*
* Don't let another task, with possibly unlocked vma,
@@ -4030,7 +4031,7 @@ int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
#endif /* __PAGETABLE_PMD_FOLDED */

static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address,
- unsigned long *start, unsigned long *end,
+ struct mmu_notifier_range *range,
pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp)
{
pgd_t *pgd;
@@ -4058,10 +4059,10 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address,
if (!pmdpp)
goto out;

- if (start && end) {
- *start = address & PMD_MASK;
- *end = *start + PMD_SIZE;
- mmu_notifier_invalidate_range_start(mm, *start, *end);
+ if (range) {
+ mmu_notifier_range_init(range, mm, address & PMD_MASK,
+ (address & PMD_MASK) + PMD_SIZE);
+ mmu_notifier_invalidate_range_start(range);
}
*ptlp = pmd_lock(mm, pmd);
if (pmd_huge(*pmd)) {
@@ -4069,17 +4070,17 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address,
return 0;
}
spin_unlock(*ptlp);
- if (start && end)
- mmu_notifier_invalidate_range_end(mm, *start, *end);
+ if (range)
+ mmu_notifier_invalidate_range_end(range);
}

if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd)))
goto out;

- if (start && end) {
- *start = address & PAGE_MASK;
- *end = *start + PAGE_SIZE;
- mmu_notifier_invalidate_range_start(mm, *start, *end);
+ if (range) {
+ range->start = address & PAGE_MASK;
+ range->end = range->start + PAGE_SIZE;
+ mmu_notifier_invalidate_range_start(range);
}
ptep = pte_offset_map_lock(mm, pmd, address, ptlp);
if (!pte_present(*ptep))
@@ -4088,8 +4089,8 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address,
return 0;
unlock:
pte_unmap_unlock(ptep, *ptlp);
- if (start && end)
- mmu_notifier_invalidate_range_end(mm, *start, *end);
+ if (range)
+ mmu_notifier_invalidate_range_end(range);
out:
return -EINVAL;
}
@@ -4101,20 +4102,20 @@ static inline int follow_pte(struct mm_struct *mm, unsigned long address,

/* (void) is needed to make gcc happy */
(void) __cond_lock(*ptlp,
- !(res = __follow_pte_pmd(mm, address, NULL, NULL,
+ !(res = __follow_pte_pmd(mm, address, NULL,
ptepp, NULL, ptlp)));
return res;
}

int follow_pte_pmd(struct mm_struct *mm, unsigned long address,
- unsigned long *start, unsigned long *end,
+ struct mmu_notifier_range *range,
pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp)
{
int res;

/* (void) is needed to make gcc happy */
(void) __cond_lock(*ptlp,
- !(res = __follow_pte_pmd(mm, address, start, end,
+ !(res = __follow_pte_pmd(mm, address, range,
ptepp, pmdpp, ptlp)));
return res;
}
diff --git a/mm/migrate.c b/mm/migrate.c
index f7e4bfdc13b7..74f5b3208c05 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2303,6 +2303,7 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp,
*/
static void migrate_vma_collect(struct migrate_vma *migrate)
{
+ struct mmu_notifier_range range;
struct mm_walk mm_walk;

mm_walk.pmd_entry = migrate_vma_collect_pmd;
@@ -2314,13 +2315,11 @@ static void migrate_vma_collect(struct migrate_vma *migrate)
mm_walk.mm = migrate->vma->vm_mm;
mm_walk.private = migrate;

- mmu_notifier_invalidate_range_start(mm_walk.mm,
- migrate->start,
- migrate->end);
+ mmu_notifier_range_init(&range, mm_walk.mm, migrate->start,
+ migrate->end);
+ mmu_notifier_invalidate_range_start(&range);
walk_page_range(migrate->start, migrate->end, &mm_walk);
- mmu_notifier_invalidate_range_end(mm_walk.mm,
- migrate->start,
- migrate->end);
+ mmu_notifier_invalidate_range_end(&range);

migrate->end = migrate->start + (migrate->npages << PAGE_SHIFT);
}
@@ -2703,7 +2702,8 @@ static void migrate_vma_pages(struct migrate_vma *migrate)
const unsigned long start = migrate->start;
struct vm_area_struct *vma = migrate->vma;
struct mm_struct *mm = vma->vm_mm;
- unsigned long addr, i, mmu_start;
+ struct mmu_notifier_range range;
+ unsigned long addr, i;
bool notified = false;

for (i = 0, addr = start; i < npages; addr += PAGE_SIZE, i++) {
@@ -2722,11 +2722,11 @@ static void migrate_vma_pages(struct migrate_vma *migrate)
continue;
}
if (!notified) {
- mmu_start = addr;
notified = true;
- mmu_notifier_invalidate_range_start(mm,
- mmu_start,
- migrate->end);
+
+ mmu_notifier_range_init(&range, mm, addr,
+ migrate->end);
+ mmu_notifier_invalidate_range_start(&range);
}
migrate_vma_insert_page(migrate, addr, newpage,
&migrate->src[i],
@@ -2767,8 +2767,7 @@ static void migrate_vma_pages(struct migrate_vma *migrate)
* did already call it.
*/
if (notified)
- mmu_notifier_invalidate_range_only_end(mm, mmu_start,
- migrate->end);
+ mmu_notifier_invalidate_range_only_end(&range);
}

/*
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index 5f6665ae3ee2..4c52b3514c50 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -174,28 +174,20 @@ void __mmu_notifier_change_pte(struct mm_struct *mm, unsigned long address,
srcu_read_unlock(&srcu, id);
}

-int __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
- unsigned long start, unsigned long end,
- bool blockable)
+int __mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range)
{
- struct mmu_notifier_range _range, *range = &_range;
struct mmu_notifier *mn;
int ret = 0;
int id;

- range->blockable = blockable;
- range->start = start;
- range->end = end;
- range->mm = mm;
-
id = srcu_read_lock(&srcu);
- hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) {
+ 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);
if (_ret) {
pr_info("%pS callback failed with %d in %sblockable context.\n",
mn->ops->invalidate_range_start, _ret,
- !blockable ? "non-" : "");
+ !range->blockable ? "non-" : "");
ret = _ret;
}
}
@@ -206,27 +198,14 @@ int __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
}
EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range_start);

-void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
- unsigned long start,
- unsigned long end,
+void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range,
bool only_end)
{
- struct mmu_notifier_range _range, *range = &_range;
struct mmu_notifier *mn;
int id;

- /*
- * The end call back will never be call if the start refused to go
- * through because of blockable was false so here assume that we
- * can block.
- */
- range->blockable = true;
- range->start = start;
- range->end = end;
- range->mm = mm;
-
id = srcu_read_lock(&srcu);
- hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) {
+ hlist_for_each_entry_rcu(mn, &range->mm->mmu_notifier_mm->list, hlist) {
/*
* Call invalidate_range here too to avoid the need for the
* subsystem of having to register an invalidate_range_end
@@ -241,7 +220,9 @@ void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
* already happen under page table lock.
*/
if (!only_end && mn->ops->invalidate_range)
- mn->ops->invalidate_range(mn, mm, start, end);
+ mn->ops->invalidate_range(mn, range->mm,
+ range->start,
+ range->end);
if (mn->ops->invalidate_range_end)
mn->ops->invalidate_range_end(mn, range);
}
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 6d331620b9e5..36cb358db170 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -167,11 +167,12 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
pgprot_t newprot, int dirty_accountable, int prot_numa)
{
pmd_t *pmd;
- struct mm_struct *mm = vma->vm_mm;
unsigned long next;
unsigned long pages = 0;
unsigned long nr_huge_updates = 0;
- unsigned long mni_start = 0;
+ struct mmu_notifier_range range;
+
+ range.start = 0;

pmd = pmd_offset(pud, addr);
do {
@@ -183,9 +184,9 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
goto next;

/* invoke the mmu notifier if the pmd is populated */
- if (!mni_start) {
- mni_start = addr;
- mmu_notifier_invalidate_range_start(mm, mni_start, end);
+ if (!range.start) {
+ mmu_notifier_range_init(&range, vma->vm_mm, addr, end);
+ mmu_notifier_invalidate_range_start(&range);
}

if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) {
@@ -214,8 +215,8 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
cond_resched();
} while (pmd++, addr = next, addr != end);

- if (mni_start)
- mmu_notifier_invalidate_range_end(mm, mni_start, end);
+ if (range.start)
+ mmu_notifier_invalidate_range_end(&range);

if (nr_huge_updates)
count_vm_numa_events(NUMA_HUGE_PTE_UPDATES, nr_huge_updates);
diff --git a/mm/mremap.c b/mm/mremap.c
index 7f9f9180e401..def01d86e36f 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -197,16 +197,14 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
bool need_rmap_locks)
{
unsigned long extent, next, old_end;
+ struct mmu_notifier_range range;
pmd_t *old_pmd, *new_pmd;
- unsigned long mmun_start; /* For mmu_notifiers */
- unsigned long mmun_end; /* For mmu_notifiers */

old_end = old_addr + len;
flush_cache_range(vma, old_addr, old_end);

- mmun_start = old_addr;
- mmun_end = old_end;
- mmu_notifier_invalidate_range_start(vma->vm_mm, mmun_start, mmun_end);
+ mmu_notifier_range_init(&range, vma->vm_mm, old_addr, old_end);
+ mmu_notifier_invalidate_range_start(&range);

for (; old_addr < old_end; old_addr += extent, new_addr += extent) {
cond_resched();
@@ -247,7 +245,7 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
new_pmd, new_addr, need_rmap_locks);
}

- mmu_notifier_invalidate_range_end(vma->vm_mm, mmun_start, mmun_end);
+ mmu_notifier_invalidate_range_end(&range);

return len + old_addr - old_end; /* how much done */
}
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 6589f60d5018..1eea8b04f27a 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -516,19 +516,20 @@ bool __oom_reap_task_mm(struct mm_struct *mm)
* count elevated without a good reason.
*/
if (vma_is_anonymous(vma) || !(vma->vm_flags & VM_SHARED)) {
- const unsigned long start = vma->vm_start;
- const unsigned long end = vma->vm_end;
+ struct mmu_notifier_range range;
struct mmu_gather tlb;

- tlb_gather_mmu(&tlb, mm, start, end);
- if (mmu_notifier_invalidate_range_start_nonblock(mm, start, end)) {
- tlb_finish_mmu(&tlb, start, end);
+ mmu_notifier_range_init(&range, mm, vma->vm_start,
+ vma->vm_end);
+ tlb_gather_mmu(&tlb, mm, range.start, range.end);
+ if (mmu_notifier_invalidate_range_start_nonblock(&range)) {
+ tlb_finish_mmu(&tlb, range.start, range.end);
ret = false;
continue;
}
- unmap_page_range(&tlb, vma, start, end, NULL);
- mmu_notifier_invalidate_range_end(mm, start, end);
- tlb_finish_mmu(&tlb, start, end);
+ unmap_page_range(&tlb, vma, range.start, range.end, NULL);
+ mmu_notifier_invalidate_range_end(&range);
+ tlb_finish_mmu(&tlb, range.start, range.end);
}
}

diff --git a/mm/rmap.c b/mm/rmap.c
index 85b7f9423352..c75f72f6fe0e 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -889,15 +889,17 @@ static bool page_mkclean_one(struct page *page, struct vm_area_struct *vma,
.address = address,
.flags = PVMW_SYNC,
};
- unsigned long start = address, end;
+ struct mmu_notifier_range range;
int *cleaned = arg;

/*
* We have to assume the worse case ie pmd for invalidation. Note that
* the page can not be free from this function.
*/
- end = min(vma->vm_end, start + (PAGE_SIZE << compound_order(page)));
- mmu_notifier_invalidate_range_start(vma->vm_mm, start, end);
+ mmu_notifier_range_init(&range, vma->vm_mm, address,
+ min(vma->vm_end, address +
+ (PAGE_SIZE << compound_order(page))));
+ mmu_notifier_invalidate_range_start(&range);

while (page_vma_mapped_walk(&pvmw)) {
unsigned long cstart;
@@ -949,7 +951,7 @@ static bool page_mkclean_one(struct page *page, struct vm_area_struct *vma,
(*cleaned)++;
}

- mmu_notifier_invalidate_range_end(vma->vm_mm, start, end);
+ mmu_notifier_invalidate_range_end(&range);

return true;
}
@@ -1345,7 +1347,7 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
pte_t pteval;
struct page *subpage;
bool ret = true;
- unsigned long start = address, end;
+ struct mmu_notifier_range range;
enum ttu_flags flags = (enum ttu_flags)arg;

/* munlock has nothing to gain from examining un-locked vmas */
@@ -1369,15 +1371,18 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
* Note that the page can not be free in this function as call of
* try_to_unmap() must hold a reference on the page.
*/
- end = min(vma->vm_end, start + (PAGE_SIZE << compound_order(page)));
+ mmu_notifier_range_init(&range, vma->vm_mm, vma->vm_start,
+ min(vma->vm_end, vma->vm_start +
+ (PAGE_SIZE << compound_order(page))));
if (PageHuge(page)) {
/*
* If sharing is possible, start and end will be adjusted
* accordingly.
*/
- adjust_range_if_pmd_sharing_possible(vma, &start, &end);
+ adjust_range_if_pmd_sharing_possible(vma, &range.start,
+ &range.end);
}
- mmu_notifier_invalidate_range_start(vma->vm_mm, start, end);
+ mmu_notifier_invalidate_range_start(&range);

while (page_vma_mapped_walk(&pvmw)) {
#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
@@ -1428,9 +1433,10 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
* we must flush them all. start/end were
* already adjusted above to cover this range.
*/
- flush_cache_range(vma, start, end);
- flush_tlb_range(vma, start, end);
- mmu_notifier_invalidate_range(mm, start, end);
+ flush_cache_range(vma, range.start, range.end);
+ flush_tlb_range(vma, range.start, range.end);
+ mmu_notifier_invalidate_range(mm, range.start,
+ range.end);

/*
* The ref count of the PMD page was dropped
@@ -1650,7 +1656,7 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
put_page(page);
}

- mmu_notifier_invalidate_range_end(vma->vm_mm, start, end);
+ mmu_notifier_invalidate_range_end(&range);

return ret;
}
--
2.17.2