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-rw-r--r--fs/proc/task_mmu.c32
1 files changed, 21 insertions, 11 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index a290966f91ec..8eec35af32e4 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -608,7 +608,8 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
ptl = pmd_trans_huge_lock(pmd, vma);
if (ptl) {
- smaps_pmd_entry(pmd, addr, walk);
+ if (pmd_present(*pmd))
+ smaps_pmd_entry(pmd, addr, walk);
spin_unlock(ptl);
return 0;
}
@@ -1012,6 +1013,9 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
goto out;
}
+ if (!pmd_present(*pmd))
+ goto out;
+
page = pmd_page(*pmd);
/* Clear accessed and referenced bits. */
@@ -1293,27 +1297,33 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
if (ptl) {
u64 flags = 0, frame = 0;
pmd_t pmd = *pmdp;
+ struct page *page = NULL;
if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(pmd))
flags |= PM_SOFT_DIRTY;
- /*
- * Currently pmd for thp is always present because thp
- * can not be swapped-out, migrated, or HWPOISONed
- * (split in such cases instead.)
- * This if-check is just to prepare for future implementation.
- */
if (pmd_present(pmd)) {
- struct page *page = pmd_page(pmd);
-
- if (page_mapcount(page) == 1)
- flags |= PM_MMAP_EXCLUSIVE;
+ page = pmd_page(pmd);
flags |= PM_PRESENT;
if (pm->show_pfn)
frame = pmd_pfn(pmd) +
((addr & ~PMD_MASK) >> PAGE_SHIFT);
}
+#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
+ else if (is_swap_pmd(pmd)) {
+ swp_entry_t entry = pmd_to_swp_entry(pmd);
+
+ frame = swp_type(entry) |
+ (swp_offset(entry) << MAX_SWAPFILES_SHIFT);
+ flags |= PM_SWAP;
+ VM_BUG_ON(!is_pmd_migration_entry(pmd));
+ page = migration_entry_to_page(entry);
+ }
+#endif
+
+ if (page && page_mapcount(page) == 1)
+ flags |= PM_MMAP_EXCLUSIVE;
for (; addr != end; addr += PAGE_SIZE) {
pagemap_entry_t pme = make_pme(frame, flags);