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-rw-r--r--mm/memory.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 347e5fad1cfa..e01abb908b6b 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1247,16 +1247,24 @@ static inline unsigned long zap_pmd_range(struct mmu_gather *tlb,
do {
next = pmd_addr_end(addr, end);
if (pmd_trans_huge(*pmd)) {
- if (next-addr != HPAGE_PMD_SIZE) {
+ if (next - addr != HPAGE_PMD_SIZE) {
VM_BUG_ON(!rwsem_is_locked(&tlb->mm->mmap_sem));
split_huge_page_pmd(vma->vm_mm, pmd);
} else if (zap_huge_pmd(tlb, vma, pmd, addr))
- continue;
+ goto next;
/* fall through */
}
- if (pmd_none_or_clear_bad(pmd))
- continue;
+ /*
+ * Here there can be other concurrent MADV_DONTNEED or
+ * trans huge page faults running, and if the pmd is
+ * none or trans huge it can change under us. This is
+ * because MADV_DONTNEED holds the mmap_sem in read
+ * mode.
+ */
+ if (pmd_none_or_trans_huge_or_clear_bad(pmd))
+ goto next;
next = zap_pte_range(tlb, vma, pmd, addr, next, details);
+next:
cond_resched();
} while (pmd++, addr = next, addr != end);