[PATCH -next] mm/dmapool: use DEVICE_ATTR_RO macro

[YueHaibing]

Use DEVICE_ATTR_RO helper instead of plain DEVICE_ATTR,
which makes the code a bit shorter and easier to read.

Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 mm/dmapool.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/dmapool.c b/mm/dmapool.c
index 16483f86360e..62083ef04878 100644
--- a/mm/dmapool.c
+++ b/mm/dmapool.c
@@ -62,8 +62,8 @@ struct dma_page {		/* cacheable header for 'allocation' bytes */
 static DEFINE_MUTEX(pools_lock);
 static DEFINE_MUTEX(pools_reg_lock);
 
-static ssize_t
-show_pools(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t pools_show(struct device *dev,
+			  struct device_attribute *attr, char *buf)
 {
 	unsigned temp;
 	unsigned size;
@@ -103,7 +103,7 @@ show_pools(struct device *dev, struct device_attribute *attr, char *buf)
 	return PAGE_SIZE - size;
 }
 
-static DEVICE_ATTR(pools, 0444, show_pools, NULL);
+static DEVICE_ATTR_RO(pools);
 
 /**
  * dma_pool_create - Creates a pool of consistent memory blocks, for dma.
-- 
2.17.1