It is pointless to mark huge zero page as freeable. Let's skip it. Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx> --- 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>