It is pointless to mark huge zero page as freeable.
Let's skip it.
Signed-off-by: Minchan Kim <minc...@kernel.org>
---
mm/huge_memory.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index f1de4ce583a6..269ed99493f0 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1542,6 +1542,9 @@ int madvise_free_huge_pmd(struct mmu_gather *tlb, struct
vm_area_struct *vma,
struct page *page;
pmd_t orig_pmd;
+ if (is_huge_zero_pmd(*pmd))
+ goto out;
+
orig_pmd = pmdp_huge_get_and_clear(mm, addr, pmd);
/* No hugepage in swapcache */
@@ -1553,6 +1556,7 @@ int madvise_free_huge_pmd(struct mmu_gather *tlb, struct
vm_area_struct *vma,
set_pmd_at(mm, addr, pmd, orig_pmd);
tlb_remove_pmd_tlb_entry(tlb, pmd, addr);
+out:
spin_unlock(ptl);
ret = 0;
}
--
1.9.1
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