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s390/mm: fork vs. 5 level page tabel 

The mm->context.asce field of a new process is not set up correctly
in case of a fork with a 5 level page table.
Add the missing case to init_new_context().

Fixes: 1aea9b3f92 ("s390/mm: implement 5 level pages tables")
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2017-08-31 12:30:54 +02:00
parent 42ff72cf27
commit 0b89ede629
1 changed files with 5 additions and 0 deletions
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5
arch/s390/include/asm/mmu_context.h
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@ -44,6 +44,11 @@ static inline int init_new_context(struct task_struct *tsk,
mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
_ASCE_USER_BITS | _ASCE_TYPE_REGION3;
break;
case -PAGE_SIZE:
/* forked 5-level task, set new asce with new_mm->pgd */
mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
_ASCE_USER_BITS | _ASCE_TYPE_REGION1;
break;
case 1UL << 53:
/* forked 4-level task, set new asce with new mm->pgd */
mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |