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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-08-31 12:30:54 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-08-31 14:03:21 +0200 |
| commit | 0b89ede629637c03b9a728fb08bfe6ed51de9be7 (patch) | |
| tree | 416e5863597438095886d763bc315f36aadcc88c /arch | |
| parent | 42ff72cf27027fa28dd79acabe01d9196f1480a7 (diff) | |
| download | linux-0b89ede629637c03b9a728fb08bfe6ed51de9be7.tar.bz2 | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/include/asm/mmu_context.h | 5 |
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 | |