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authorDominik Dingel <dingel@linux.vnet.ibm.com>2014-10-15 15:29:01 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2014-10-27 13:27:29 +0100
commit6972cae523de728ad5e8dae01da4a631d98b874c (patch)
tree0da345f590cd16d51d4880fab91d252135b80533 /arch/s390/mm
parent7a5388de5c70f7a92de71e03ce72692c1827d162 (diff)
s390/mm: missing pte for gmap_ipte_notify should trigger a VM_BUG
After fixup_user_fault does not fail we have a writeable pte. That pte might transform but it should not vanish. Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm')
-rw-r--r--arch/s390/mm/pgtable.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index b1871d39e46e..9c8a6dd8a49c 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -752,8 +752,7 @@ int gmap_ipte_notify(struct gmap *gmap, unsigned long gaddr, unsigned long len)
break;
/* Walk the process page table, lock and get pte pointer */
ptep = get_locked_pte(gmap->mm, addr, &ptl);
- if (unlikely(!ptep))
- continue;
+ VM_BUG_ON(!ptep);
/* Set notification bit in the pgste of the pte */
entry = *ptep;
if ((pte_val(entry) & (_PAGE_INVALID | _PAGE_PROTECT)) == 0) {