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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2017-08-31 12:30:54 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2017-08-31 14:03:21 +0200
commit0b89ede629637c03b9a728fb08bfe6ed51de9be7 (patch)
tree416e5863597438095886d763bc315f36aadcc88c
parent42ff72cf27027fa28dd79acabe01d9196f1480a7 (diff)
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: 1aea9b3f9210 ("s390/mm: implement 5 level pages tables") Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/include/asm/mmu_context.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index 4541ac44b35f..24bc41622a98 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -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 |