[ 79/79] s390: Add pgste to ptep_modify_prot_start()

[Greg Kroah-Hartman]

3.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <ben@xxxxxxxxxxxxxxx>

Commit 52f36be0f4e2 's390/pgtable: Fix check for pgste/storage key
handling', which was commit b56433cb782d upstream, added a use of
pgste to ptep_modify_prot_start(), but this variable does not exist.
In mainline, pgste was added by commit d3383632d4e8 's390/mm: add pte
invalidation notifier for kvm' and initialised to the return value of
pgste_get_lock(ptep).  Initialise it similarly here.

Compile-tested only.

Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/s390/include/asm/pgtable.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1063,11 +1063,12 @@ static inline pte_t ptep_modify_prot_sta
 					   unsigned long address,
 					   pte_t *ptep)
 {
+	pgste_t pgste;
 	pte_t pte;
 
 	mm->context.flush_mm = 1;
 	if (mm_has_pgste(mm))
-		pgste_get_lock(ptep);
+		pgste = pgste_get_lock(ptep);
 
 	pte = *ptep;
 	if (!mm_exclusive(mm))


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