[PATCH] mm/powerpc: Fix _PAGE_PTE breaking swapoff

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

When converting a swp_entry_t to pte, we need to add _PAGE_PTE,
because we later compare the pte with linux page table entries to
find a matching pte. We do set _PAGE_PTE on pte entries on linux page
table even if it is a swap entry. So add them when converting
swp_entry_t to pte_t

The stack trace can be anywhere below try_to_unuse() in mm/swapfile.c,
since swapoff is circling around and around that function, reading from
each used swap block into a page, then trying to find where that page
belongs, looking at every non-file pte of every mm that ever swapped.

Reported-by: Hugh Dickins <hughd@google.com>
Suggested-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/book3s/64/pgtable.h | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 03c1a5a21c0c..48edcd8fbc4f 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -158,9 +158,14 @@ static inline void pgd_set(pgd_t *pgdp, unsigned long val)
 #define __swp_entry(type, offset)	((swp_entry_t) { \
 					((type) << _PAGE_BIT_SWAP_TYPE) \
 					| ((offset) << PTE_RPN_SHIFT) })
-
-#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val((pte)) })
-#define __swp_entry_to_pte(x)		__pte((x).val)
+/*
+ * swp_entry_t should be arch independent. We build a swp_entry_t from
+ * swap type and offset we get from swap and convert that to pte to
+ * find a matching pte in linux page table.
+ * Clear bits not found in swap entries here
+ */
+#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val((pte)) & ~_PAGE_PTE })
+#define __swp_entry_to_pte(x)	__pte((x).val | _PAGE_PTE)
 
 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
 #define _PAGE_SWP_SOFT_DIRTY   (1UL << (SWP_TYPE_BITS + _PAGE_BIT_SWAP_TYPE))
-- 
2.5.0