Hello Heiko.
Commit ea81531d ("s390/uaccess: fix page table walk")
added this code. It looks like it should have break;
for each case.
------------
static unsigned long follow_table(struct mm_struct *mm,
unsigned long address, int write)
{
unsigned long *table = (unsigned long *)__pa(mm->pgd);
switch (mm->context.asce_bits & _ASCE_TYPE_MASK) {
case _ASCE_TYPE_REGION1:
table = table + ((address >> 53) & 0x7ff);
if (unlikely(*table & _REGION_ENTRY_INV))
return -0x39UL;
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
case _ASCE_TYPE_REGION2:
table = table + ((address >> 42) & 0x7ff);
if (unlikely(*table & _REGION_ENTRY_INV))
return -0x3aUL;
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
case _ASCE_TYPE_REGION3:
table = table + ((address >> 31) & 0x7ff);
if (unlikely(*table & _REGION_ENTRY_INV))
return -0x3bUL;
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
case _ASCE_TYPE_SEGMENT:
table = table + ((address >> 20) & 0x7ff);
if (unlikely(*table & _SEGMENT_ENTRY_INV))
return -0x10UL;
if (unlikely(*table & _SEGMENT_ENTRY_LARGE)) {
if (write && (*table & _SEGMENT_ENTRY_RO))
return -0x04UL;
return (*table & _SEGMENT_ENTRY_ORIGIN_LARGE) +
(address & ~_SEGMENT_ENTRY_ORIGIN_LARGE);
}
table = (unsigned long *)(*table & _SEGMENT_ENTRY_ORIGIN);
}
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