diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memory.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/mm/memory.c b/mm/memory.c index 164951c47305..cef95c8c77fa 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1575,11 +1575,10 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, * behaviour that some programs depend on. We mark the "original" * un-COW'ed pages by matching them up with "vma->vm_pgoff". */ - if (is_cow_mapping(vma->vm_flags)) { - if (addr != vma->vm_start || end != vma->vm_end) - return -EINVAL; + if (addr == vma->vm_start && end == vma->vm_end) vma->vm_pgoff = pfn; - } + else if (is_cow_mapping(vma->vm_flags)) + return -EINVAL; vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP; |