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Commit 0b89ede6 authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

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: 1aea9b3f ("s390/mm: implement 5 level pages tables")
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 42ff72cf

arch/s390/include/asm/mmu_context.h

+5 −0
Original line number Diff line number Diff line
@@ -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 |