diff options
Diffstat (limited to 'arch/s390/include/asm')
| -rw-r--r-- | arch/s390/include/asm/pgalloc.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pgalloc.h b/arch/s390/include/asm/pgalloc.h index 77606c4acd58..f0d7457fa1da 100644 --- a/arch/s390/include/asm/pgalloc.h +++ b/arch/s390/include/asm/pgalloc.h @@ -48,6 +48,20 @@ static inline unsigned long pgd_entry_type(struct mm_struct *mm) int crst_table_upgrade(struct mm_struct *mm, unsigned long limit); void crst_table_downgrade(struct mm_struct *); +static inline unsigned long check_asce_limit(struct mm_struct *mm, unsigned long addr, + unsigned long len) +{ + int rc; + + if (addr + len > mm->context.asce_limit && + addr + len <= TASK_SIZE) { + rc = crst_table_upgrade(mm, addr + len); + if (rc) + return (unsigned long) rc; + } + return addr; +} + static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address) { unsigned long *table = crst_table_alloc(mm); |