diff options
Diffstat (limited to 'arch/s390/mm/pgtable.c')
| -rw-r--r-- | arch/s390/mm/pgtable.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 96e85ac8926..441d34445d0 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -393,7 +393,10 @@ out_unmap: } EXPORT_SYMBOL_GPL(gmap_map_segment); -unsigned long gmap_fault(unsigned long address, struct gmap *gmap) +/* + * this function is assumed to be called with mmap_sem held + */ +unsigned long __gmap_fault(unsigned long address, struct gmap *gmap) { unsigned long *table, vmaddr, segment; struct mm_struct *mm; @@ -461,7 +464,17 @@ unsigned long gmap_fault(unsigned long address, struct gmap *gmap) return vmaddr | (address & ~PMD_MASK); } return -EFAULT; +} + +unsigned long gmap_fault(unsigned long address, struct gmap *gmap) +{ + unsigned long rc; + + down_read(&gmap->mm->mmap_sem); + rc = __gmap_fault(address, gmap); + up_read(&gmap->mm->mmap_sem); + return rc; } EXPORT_SYMBOL_GPL(gmap_fault); |