1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index 6833ada237ab..7b0bf825c4e7 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -428,9 +428,21 @@ static int dev_dax_fault(struct vm_fault *vmf)
         return dev_dax_huge_fault(vmf, PE_SIZE_PTE);
 }
 
+static int dev_dax_split(struct vm_area_struct *vma, unsigned long addr)
+{
+        struct file *filp = vma->vm_file;
+        struct dev_dax *dev_dax = filp->private_data;
+        struct dax_region *dax_region = dev_dax->region;
+
+        if (!IS_ALIGNED(addr, dax_region->align))
+                return -EINVAL;
+        return 0;
+}
+
 static const struct vm_operations_struct dax_vm_ops = {
         .fault = dev_dax_fault,
         .huge_fault = dev_dax_huge_fault,
+        .split = dev_dax_split,
 };
 
 static int dax_mmap(struct file *filp, struct vm_area_struct *vma)