diff options
Diffstat (limited to 'mm/huge_memory.c')
| -rw-r--r-- | mm/huge_memory.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 17ec6c939e7f..4414111998df 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1389,6 +1389,9 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma, page = pmd_page(*pmd); VM_BUG_ON_PAGE(!PageHead(page) && !is_zone_device_page(page), page); + if (!pmd_write(*pmd) && gup_must_unshare(flags, page)) + return ERR_PTR(-EMLINK); + if (!try_grab_page(page, flags)) return ERR_PTR(-ENOMEM); |