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| author |   Alexander Gordeev <agordeev@linux.ibm.com> | 2020-02-28 11:32:01 +0100 |
|---|---|---|
| committer |   Vasily Gorbik <gor@linux.ibm.com> | 2020-03-28 12:46:12 +0100 |
| commit | 6a3eb35e56b3308966945b76ec1dfbc18537feef (patch) | |
| tree | 2a10a11c9f08507830ebad5b4982cd1bbe4737ae /arch/s390/include/asm/mmu_context.h | |
| parent | s390/qdio: set qdio_irq->cdev at allocation time (diff) | |
| download | linux-dev-6a3eb35e56b3308966945b76ec1dfbc18537feef.tar.xz linux-dev-6a3eb35e56b3308966945b76ec1dfbc18537feef.zip | |
s390/mm: remove page table downgrade support
This update consolidates page table handling code. Because
there are hardly any 31-bit binaries left we do not need to
optimize for that.
No extra efforts are needed to ensure that a compat task does
not map anything above 2GB. The TASK_SIZE limit for 31-bit
tasks is 2GB already and the generic code does check that a
resulting map address would not surpass that limit.
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/mmu_context.h')
| -rw-r--r-- | arch/s390/include/asm/mmu_context.h | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h index 8d04e6f3f796..3763734965e4 100644 --- a/arch/s390/include/asm/mmu_context.h +++ b/arch/s390/include/asm/mmu_context.h @@ -25,7 +25,6 @@ static inline int init_new_context(struct task_struct *tsk, atomic_set(&mm->context.flush_count, 0); mm->context.gmap_asce = 0; mm->context.flush_mm = 0; - mm->context.compat_mm = test_thread_flag(TIF_31BIT); #ifdef CONFIG_PGSTE mm->context.alloc_pgste = page_table_allocate_pgste || test_thread_flag(TIF_PGSTE) || @@ -57,10 +56,6 @@ static inline int init_new_context(struct task_struct *tsk, mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | _ASCE_USER_BITS | _ASCE_TYPE_REGION2; break; - case _REGION3_SIZE: - /* forked 2-level compat task, set new asce with new mm->pgd */ - mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | - _ASCE_USER_BITS | _ASCE_TYPE_SEGMENT; } crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm)); return 0; |