From: "Aneesh Kumar K.V" <aneesh.ku...@linux.vnet.ibm.com>
Book3E uses the hugepd at PMD level and don't encode pte directly
at the pmd level. So it will find the lower bits of pmd set
and the pmd_bad check throws error. Infact the current code
will never take the free_hugepd_range call at all because it will
clear the pmd if it find a hugepd pointer.
Reported-by: Scott Wood <scottw...@freescale.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
---
arch/powerpc/mm/hugetlbpage.c | 29 ++++++++++++++++++-----------
1 file changed, 18 insertions(+), 11 deletions(-)
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index f2f01fd..0d3d3ee 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -536,19 +536,26 @@ static void hugetlb_free_pmd_range(struct mmu_gather
*tlb, pud_t *pud,
do {
pmd = pmd_offset(pud, addr);
next = pmd_addr_end(addr, end);
- if (pmd_none_or_clear_bad(pmd))
- continue;
+ if (!is_hugepd(pmd)) {
+ /*
+ * if it is not hugepd pointer, we should already find
+ * it cleared.
+ */
+ if (!pmd_none_or_clear_bad(pmd))
+ WARN_ON(1);
+ } else {
#ifdef CONFIG_PPC_FSL_BOOK3E
- /*
- * Increment next by the size of the huge mapping since
- * there may be more than one entry at this level for a
- * single hugepage, but all of them point to
- * the same kmem cache that holds the hugepte.
- */
- next = addr + (1 << hugepd_shift(*(hugepd_t *)pmd));
+ /*
+ * Increment next by the size of the huge mapping since
+ * there may be more than one entry at this level for a
+ * single hugepage, but all of them point to
+ * the same kmem cache that holds the hugepte.
+ */
+ next = addr + (1 << hugepd_shift(*(hugepd_t *)pmd));
#endif
- free_hugepd_range(tlb, (hugepd_t *)pmd, PMD_SHIFT,
- addr, next, floor, ceiling);
+ free_hugepd_range(tlb, (hugepd_t *)pmd, PMD_SHIFT,
+ addr, next, floor, ceiling);
+ }
} while (addr = next, addr != end);
start &= PUD_MASK;
--
1.8.1.2
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