summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--mm/gup.c9
-rw-r--r--mm/ksm.c7
-rw-r--r--mm/memcontrol.c8
-rw-r--r--mm/memory-failure.c8
-rw-r--r--mm/migrate.c3
5 files changed, 22 insertions, 13 deletions
diff --git a/mm/gup.c b/mm/gup.c
index d448fd286b8c..598e8c98367b 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -545,10 +545,10 @@ static struct page *follow_page_pte(struct vm_area_struct *vma,
if (WARN_ON_ONCE((flags & (FOLL_PIN | FOLL_GET)) ==
(FOLL_PIN | FOLL_GET)))
return ERR_PTR(-EINVAL);
- if (unlikely(pmd_bad(*pmd)))
- return no_page_table(vma, flags);
ptep = pte_offset_map_lock(mm, pmd, address, &ptl);
+ if (!ptep)
+ return no_page_table(vma, flags);
pte = *ptep;
if (!pte_present(pte))
goto no_page;
@@ -852,8 +852,9 @@ static int get_gate_page(struct mm_struct *mm, unsigned long address,
pmd = pmd_offset(pud, address);
if (!pmd_present(*pmd))
return -EFAULT;
- VM_BUG_ON(pmd_trans_huge(*pmd));
pte = pte_offset_map(pmd, address);
+ if (!pte)
+ return -EFAULT;
if (pte_none(*pte))
goto unmap;
*vma = get_gate_vma(mm);
@@ -2468,6 +2469,8 @@ static int gup_pte_range(pmd_t pmd, pmd_t *pmdp, unsigned long addr,
pte_t *ptep, *ptem;
ptem = ptep = pte_offset_map(&pmd, addr);
+ if (!ptep)
+ return 0;
do {
pte_t pte = ptep_get_lockless(ptep);
struct page *page;
diff --git a/mm/ksm.c b/mm/ksm.c
index df2aa281d49d..3dc15459dd20 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -431,10 +431,9 @@ static int break_ksm_pmd_entry(pmd_t *pmd, unsigned long addr, unsigned long nex
pte_t *pte;
int ret;
- if (pmd_leaf(*pmd) || !pmd_present(*pmd))
- return 0;
-
pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
+ if (!pte)
+ return 0;
if (pte_present(*pte)) {
page = vm_normal_page(walk->vma, addr, *pte);
} else if (!pte_none(*pte)) {
@@ -1203,6 +1202,8 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
mmu_notifier_invalidate_range_start(&range);
ptep = pte_offset_map_lock(mm, pmd, addr, &ptl);
+ if (!ptep)
+ goto out_mn;
if (!pte_same(*ptep, orig_pte)) {
pte_unmap_unlock(ptep, ptl);
goto out_mn;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index caf6ab55f8e3..77d8d2d14fcf 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6021,9 +6021,9 @@ static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd,
return 0;
}
- if (pmd_trans_unstable(pmd))
- return 0;
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
+ if (!pte)
+ return 0;
for (; addr != end; pte++, addr += PAGE_SIZE)
if (get_mctgt_type(vma, addr, *pte, NULL))
mc.precharge++; /* increment precharge temporarily */
@@ -6241,10 +6241,10 @@ static int mem_cgroup_move_charge_pte_range(pmd_t *pmd,
return 0;
}
- if (pmd_trans_unstable(pmd))
- return 0;
retry:
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
+ if (!pte)
+ return 0;
for (; addr != end; addr += PAGE_SIZE) {
pte_t ptent = *(pte++);
bool device = false;
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 004a02f44271..d5116f0eb1b6 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -405,6 +405,8 @@ static unsigned long dev_pagemap_mapping_shift(struct vm_area_struct *vma,
if (pmd_devmap(*pmd))
return PMD_SHIFT;
pte = pte_offset_map(pmd, address);
+ if (!pte)
+ return 0;
if (pte_present(*pte) && pte_devmap(*pte))
ret = PAGE_SHIFT;
pte_unmap(pte);
@@ -791,11 +793,11 @@ static int hwpoison_pte_range(pmd_t *pmdp, unsigned long addr,
goto out;
}
- if (pmd_trans_unstable(pmdp))
- goto out;
-
mapped_pte = ptep = pte_offset_map_lock(walk->vma->vm_mm, pmdp,
addr, &ptl);
+ if (!ptep)
+ goto out;
+
for (; addr != end; ptep++, addr += PAGE_SIZE) {
ret = check_hwpoisoned_entry(*ptep, addr, PAGE_SHIFT,
hwp->pfn, &hwp->tk);
diff --git a/mm/migrate.c b/mm/migrate.c
index c1f2c40441e1..363562992046 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -305,6 +305,9 @@ void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
swp_entry_t entry;
ptep = pte_offset_map_lock(mm, pmd, address, &ptl);
+ if (!ptep)
+ return;
+
pte = *ptep;
pte_unmap(ptep);