[PATCH v2 2/2] device-dax: implement ->pagesize() for smaps to report MMUPageSize

From: Dan Williams <dan.j.williams(a)intel.com&gt; Given that device-dax is making similar page mapping size guarantees as hugetlbfs, emit the size in smaps and any other kernel path that requests the mapping size of a vma. Reported-by: Jane Chu <jane.chu(a)oracle.com&gt; Signed-off-by: Dan Williams <dan.j.williams(a)intel.com&gt; --- drivers/dax/device.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/dax/device.c b/drivers/dax/device.c index 7b0bf825c4e7..b57cd5a7b0bd 100644 --- a/drivers/dax/device.c +++ b/drivers/dax/device.c @@ -439,10 +439,20 @@ static int dev_dax_split(struct vm_area_struct *vma, unsigned long addr) return 0; } +static unsigned long dev_dax_pagesize(struct vm_area_struct *vma) +{ + struct file *filp = vma->vm_file; + struct dev_dax *dev_dax = filp->private_data; + struct dax_region *dax_region = dev_dax->region; + + return dax_region->align; +} + static const struct vm_operations_struct dax_vm_ops = { .fault = dev_dax_fault, .huge_fault = dev_dax_huge_fault, .split = dev_dax_split, + .pagesize = dev_dax_pagesize, }; static int dax_mmap(struct file *filp, struct vm_area_struct *vma)