[PATCH v5 6/8] device-dax: use struct_size()

[Joao Martins]

Use the struct_size() helper for the size of a struct with variable array
member at the end, rather than manually calculating it.

Suggested-by: Dan Williams <dan.j.willi...@intel.com>
Signed-off-by: Joao Martins <joao.m.mart...@oracle.com>
---
 drivers/dax/device.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index 0b82159b3564..d6796a3115a6 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -404,8 +404,9 @@ int dev_dax_probe(struct dev_dax *dev_dax)
                return -EINVAL;
 
        if (!pgmap) {
-               pgmap = devm_kzalloc(dev, sizeof(*pgmap) + sizeof(struct range)
-                               * (dev_dax->nr_range - 1), GFP_KERNEL);
+               pgmap = devm_kzalloc(
+                       dev, struct_size(pgmap, ranges, dev_dax->nr_range - 1),
+                       GFP_KERNEL);
                if (!pgmap)
                        return -ENOMEM;
                pgmap->nr_range = dev_dax->nr_range;
-- 
2.17.2