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| author | Dominik Dingel <dingel@linux.vnet.ibm.com> | 2014-10-15 13:29:01 (GMT) |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2014-10-27 12:27:29 (GMT) |
| commit | 6972cae523de728ad5e8dae01da4a631d98b874c (patch) | |
| tree | 0da345f590cd16d51d4880fab91d252135b80533 | |
| parent | 7a5388de5c70f7a92de71e03ce72692c1827d162 (diff) | |
| download | linux-6972cae523de728ad5e8dae01da4a631d98b874c.tar.xz | |
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>
| -rw-r--r-- | arch/s390/mm/pgtable.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index b1871d3..9c8a6dd 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) { |