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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>
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@ -752,8 +752,7 @@ int gmap_ipte_notify(struct gmap *gmap, unsigned long gaddr, unsigned long len)
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break;
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/* Walk the process page table, lock and get pte pointer */
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ptep = get_locked_pte(gmap->mm, addr, &ptl);
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if (unlikely(!ptep))
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continue;
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VM_BUG_ON(!ptep);
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/* Set notification bit in the pgste of the pte */
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entry = *ptep;
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if ((pte_val(entry) & (_PAGE_INVALID | _PAGE_PROTECT)) == 0) {
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