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-rw-r--r--include/linux/mm.h2
-rw-r--r--mm/filemap.c2
-rw-r--r--mm/memory.c23
3 files changed, 20 insertions, 7 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index fbdb9d40847f..f223ac26b5d9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -596,7 +596,7 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
}
void do_set_pte(struct vm_area_struct *vma, unsigned long address,
- struct page *page, pte_t *pte, bool write, bool anon);
+ struct page *page, pte_t *pte, bool write, bool anon, bool old);
#endif
/*
diff --git a/mm/filemap.c b/mm/filemap.c
index 8f4859989f1b..b418405903bc 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2191,7 +2191,7 @@ repeat:
if (file->f_ra.mmap_miss > 0)
file->f_ra.mmap_miss--;
addr = address + (page->index - vmf->pgoff) * PAGE_SIZE;
- do_set_pte(vma, addr, page, pte, false, false);
+ do_set_pte(vma, addr, page, pte, false, false, true);
unlock_page(page);
goto next;
unlock:
diff --git a/mm/memory.c b/mm/memory.c
index 007c72ad03f6..f29e5ab0342d 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2876,7 +2876,7 @@ static int __do_fault(struct vm_area_struct *vma, unsigned long address,
* vm_ops->map_pages.
*/
void do_set_pte(struct vm_area_struct *vma, unsigned long address,
- struct page *page, pte_t *pte, bool write, bool anon)
+ struct page *page, pte_t *pte, bool write, bool anon, bool old)
{
pte_t entry;
@@ -2884,6 +2884,8 @@ void do_set_pte(struct vm_area_struct *vma, unsigned long address,
entry = mk_pte(page, vma->vm_page_prot);
if (write)
entry = maybe_mkwrite(pte_mkdirty(entry), vma);
+ if (old)
+ entry = pte_mkold(entry);
if (anon) {
inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES);
page_add_new_anon_rmap(page, vma, address, false);
@@ -3021,9 +3023,20 @@ static int do_read_fault(struct mm_struct *mm, struct vm_area_struct *vma,
*/
if (vma->vm_ops->map_pages && fault_around_bytes >> PAGE_SHIFT > 1) {
pte = pte_offset_map_lock(mm, pmd, address, &ptl);
- do_fault_around(vma, address, pte, pgoff, flags);
if (!pte_same(*pte, orig_pte))
goto unlock_out;
+ do_fault_around(vma, address, pte, pgoff, flags);
+ /* Check if the fault is handled by faultaround */
+ if (!pte_same(*pte, orig_pte)) {
+ /*
+ * Faultaround produce old pte, but the pte we've
+ * handler fault for should be young.
+ */
+ pte_t entry = pte_mkyoung(*pte);
+ if (ptep_set_access_flags(vma, address, pte, entry, 0))
+ update_mmu_cache(vma, address, pte);
+ goto unlock_out;
+ }
pte_unmap_unlock(pte, ptl);
}
@@ -3038,7 +3051,7 @@ static int do_read_fault(struct mm_struct *mm, struct vm_area_struct *vma,
put_page(fault_page);
return ret;
}
- do_set_pte(vma, address, fault_page, pte, false, false);
+ do_set_pte(vma, address, fault_page, pte, false, false, false);
unlock_page(fault_page);
unlock_out:
pte_unmap_unlock(pte, ptl);
@@ -3090,7 +3103,7 @@ static int do_cow_fault(struct mm_struct *mm, struct vm_area_struct *vma,
}
goto uncharge_out;
}
- do_set_pte(vma, address, new_page, pte, true, true);
+ do_set_pte(vma, address, new_page, pte, true, true, false);
mem_cgroup_commit_charge(new_page, memcg, false, false);
lru_cache_add_active_or_unevictable(new_page, vma);
pte_unmap_unlock(pte, ptl);
@@ -3147,7 +3160,7 @@ static int do_shared_fault(struct mm_struct *mm, struct vm_area_struct *vma,
put_page(fault_page);
return ret;
}
- do_set_pte(vma, address, fault_page, pte, true, false);
+ do_set_pte(vma, address, fault_page, pte, true, false, false);
pte_unmap_unlock(pte, ptl);
if (set_page_dirty(fault_page))