[RFC PATCH 09/28] mm/mempolicy: mark VMA as locked when changing protection policy
Suren Baghdasaryan
surenb at google.com
Tue Aug 30 07:25:12 AEST 2022
Protect VMA from concurrent page fault handler while performing VMA
protection policy changes.
Signed-off-by: Suren Baghdasaryan <surenb at google.com>
---
mm/mempolicy.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index b73d3248d976..6be1e5c75556 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -383,8 +383,10 @@ void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new)
struct vm_area_struct *vma;
mmap_write_lock(mm);
- for (vma = mm->mmap; vma; vma = vma->vm_next)
+ for (vma = mm->mmap; vma; vma = vma->vm_next) {
+ vma_mark_locked(vma);
mpol_rebind_policy(vma->vm_policy, new);
+ }
mmap_write_unlock(mm);
}
@@ -632,6 +634,7 @@ unsigned long change_prot_numa(struct vm_area_struct *vma,
struct mmu_gather tlb;
int nr_updated;
+ vma_mark_locked(vma);
tlb_gather_mmu(&tlb, vma->vm_mm);
nr_updated = change_protection(&tlb, vma, addr, end, PAGE_NONE,
@@ -765,6 +768,7 @@ static int vma_replace_policy(struct vm_area_struct *vma,
if (IS_ERR(new))
return PTR_ERR(new);
+ vma_mark_locked(vma);
if (vma->vm_ops && vma->vm_ops->set_policy) {
err = vma->vm_ops->set_policy(vma, new);
if (err)
--
2.37.2.672.g94769d06f0-goog
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