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s390/mm: correct pgtable_bytes on page table downgrade 

The downgrade of a page table from 3 levels to 2 levels for a 31-bit compat
process removes a pmd table which has to be counted against pgtable_bytes.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2018-11-27 14:04:04 +01:00
parent 104f708fd1
commit 814cedbc0b
1 changed files with 1 additions and 0 deletions
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1
arch/s390/mm/pgalloc.c
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@ -131,6 +131,7 @@ void crst_table_downgrade(struct mm_struct *mm)
}
pgd = mm->pgd;
mm_dec_nr_pmds(mm);
mm->pgd = (pgd_t *) (pgd_val(*pgd) & _REGION_ENTRY_ORIGIN);
mm->context.asce_limit = _REGION3_SIZE;
mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |