diff options
Diffstat (limited to 'arch/s390/mm/mmap.c')
| -rw-r--r-- | arch/s390/mm/mmap.c | 48 |
1 files changed, 32 insertions, 16 deletions
diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c index 5932a824547a..e008d236cc15 100644 --- a/arch/s390/mm/mmap.c +++ b/arch/s390/mm/mmap.c @@ -35,7 +35,7 @@ * Leave an at least ~128 MB hole. */ #define MIN_GAP (128*1024*1024) -#define MAX_GAP (TASK_SIZE/6*5) +#define MAX_GAP (STACK_TOP/6*5) static inline unsigned long mmap_base(void) { @@ -46,7 +46,7 @@ static inline unsigned long mmap_base(void) else if (gap > MAX_GAP) gap = MAX_GAP; - return TASK_SIZE - (gap & PAGE_MASK); + return STACK_TOP - (gap & PAGE_MASK); } static inline int mmap_is_legacy(void) @@ -89,42 +89,58 @@ EXPORT_SYMBOL_GPL(arch_pick_mmap_layout); #else +int s390_mmap_check(unsigned long addr, unsigned long len) +{ + if (!test_thread_flag(TIF_31BIT) && + len >= TASK_SIZE && TASK_SIZE < (1UL << 53)) + return crst_table_upgrade(current->mm, 1UL << 53); + return 0; +} + static unsigned long s390_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { struct mm_struct *mm = current->mm; + unsigned long area; int rc; - addr = arch_get_unmapped_area(filp, addr, len, pgoff, flags); - if (addr & ~PAGE_MASK) - return addr; - if (unlikely(mm->context.asce_limit < addr + len)) { - rc = crst_table_upgrade(mm, addr + len); + area = arch_get_unmapped_area(filp, addr, len, pgoff, flags); + if (!(area & ~PAGE_MASK)) + return area; + if (area == -ENOMEM && + !test_thread_flag(TIF_31BIT) && TASK_SIZE < (1UL << 53)) { + /* Upgrade the page table to 4 levels and retry. */ + rc = crst_table_upgrade(mm, 1UL << 53); if (rc) return (unsigned long) rc; + area = arch_get_unmapped_area(filp, addr, len, pgoff, flags); } - return addr; + return area; } static unsigned long -s390_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, +s390_get_unmapped_area_topdown(struct file *filp, const unsigned long addr, const unsigned long len, const unsigned long pgoff, const unsigned long flags) { struct mm_struct *mm = current->mm; - unsigned long addr = addr0; + unsigned long area; int rc; - addr = arch_get_unmapped_area_topdown(filp, addr, len, pgoff, flags); - if (addr & ~PAGE_MASK) - return addr; - if (unlikely(mm->context.asce_limit < addr + len)) { - rc = crst_table_upgrade(mm, addr + len); + area = arch_get_unmapped_area_topdown(filp, addr, len, pgoff, flags); + if (!(area & ~PAGE_MASK)) + return area; + if (area == -ENOMEM && + !test_thread_flag(TIF_31BIT) && TASK_SIZE < (1UL << 53)) { + /* Upgrade the page table to 4 levels and retry. */ + rc = crst_table_upgrade(mm, 1UL << 53); if (rc) return (unsigned long) rc; + area = arch_get_unmapped_area_topdown(filp, addr, len, + pgoff, flags); } - return addr; + return area; } /* * This function, called very early during the creation of a new |