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s390x/mmu: Fix the handling of the table levels
The current code used a wrong and very confusing way of dealing with the table levels by introducing a "fake level above current". However, the real problem was simply that the checks for the region/segment invalid bit and for the matching region/segment level was done at the wrong spot in the code - it has to be done after the first table entry has been looked up instead (e.g. there is also no "invalid" bit in the ASCE itself and the current "level" has to be the same as the level in the entry that we just looked up). Also the entries for the segment table are quite a bit different compared to the region table entries. So this patch moves the related code into the function mmu_translate_segment() to make it clear at which table level we currently are and to get rid of the ugly switch-statement in the function mmu_translate_region(). Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
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