diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/dax/device.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/dax/device.c b/drivers/dax/device.c index 60d43cb195da..591f293d326f 100644 --- a/drivers/dax/device.c +++ b/drivers/dax/device.c @@ -78,14 +78,20 @@ static void dax_set_mapping(struct vm_fault *vmf, pfn_t pfn, { unsigned long i, nr_pages = fault_size / PAGE_SIZE; struct file *filp = vmf->vma->vm_file; + struct dev_dax *dev_dax = filp->private_data; pgoff_t pgoff; + /* mapping is only set on the head */ + if (dev_dax->pgmap->vmemmap_shift) + nr_pages = 1; + pgoff = linear_page_index(vmf->vma, ALIGN(vmf->address, fault_size)); for (i = 0; i < nr_pages; i++) { struct page *page = pfn_to_page(pfn_t_to_pfn(pfn) + i); + page = compound_head(page); if (page->mapping) continue; @@ -443,6 +449,9 @@ int dev_dax_probe(struct dev_dax *dev_dax) } pgmap->type = MEMORY_DEVICE_GENERIC; + if (dev_dax->align > PAGE_SIZE) + pgmap->vmemmap_shift = + order_base_2(dev_dax->align >> PAGE_SHIFT); addr = devm_memremap_pages(dev, pgmap); if (IS_ERR(addr)) return PTR_ERR(addr); |