linux-kernel - [PATCH -next] mm/dmapool: use DEVICE_ATTR

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Date:   Sun, 23 May 2021 14:46:26 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <akpm@...ux-foundation.org>, <andriy.shevchenko@...ux.intel.com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH -next] mm/dmapool: use DEVICE_ATTR_RO macro

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@...wei.com>
---
 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