xen: Use DEVICE_ATTR_*() macro
Use DEVICE_ATTR_*() helper instead of plain DEVICE_ATTR(),
which makes the code a bit shorter and easier to read.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20210526141019.13752-1-yuehaibing@huawei.com
Signed-off-by: Juergen Gross <jgross@suse.com>
diff --git a/drivers/xen/xen-balloon.c b/drivers/xen/xen-balloon.c
index a8d2443..8cd583d 100644
--- a/drivers/xen/xen-balloon.c
+++ b/drivers/xen/xen-balloon.c
@@ -134,13 +134,13 @@ void xen_balloon_init(void)
EXPORT_SYMBOL_GPL(xen_balloon_init);
#define BALLOON_SHOW(name, format, args...) \
- static ssize_t show_##name(struct device *dev, \
+ static ssize_t name##_show(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
return sprintf(buf, format, ##args); \
} \
- static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
+ static DEVICE_ATTR_RO(name)
BALLOON_SHOW(current_kb, "%lu\n", PAGES2KB(balloon_stats.current_pages));
BALLOON_SHOW(low_kb, "%lu\n", PAGES2KB(balloon_stats.balloon_low));
@@ -152,16 +152,15 @@ static DEVICE_ULONG_ATTR(retry_count, 0444, balloon_stats.retry_count);
static DEVICE_ULONG_ATTR(max_retry_count, 0644, balloon_stats.max_retry_count);
static DEVICE_BOOL_ATTR(scrub_pages, 0644, xen_scrub_pages);
-static ssize_t show_target_kb(struct device *dev, struct device_attribute *attr,
+static ssize_t target_kb_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%lu\n", PAGES2KB(balloon_stats.target_pages));
}
-static ssize_t store_target_kb(struct device *dev,
+static ssize_t target_kb_store(struct device *dev,
struct device_attribute *attr,
- const char *buf,
- size_t count)
+ const char *buf, size_t count)
{
char *endchar;
unsigned long long target_bytes;
@@ -176,22 +175,19 @@ static ssize_t store_target_kb(struct device *dev,
return count;
}
-static DEVICE_ATTR(target_kb, S_IRUGO | S_IWUSR,
- show_target_kb, store_target_kb);
+static DEVICE_ATTR_RW(target_kb);
-
-static ssize_t show_target(struct device *dev, struct device_attribute *attr,
- char *buf)
+static ssize_t target_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
{
return sprintf(buf, "%llu\n",
(unsigned long long)balloon_stats.target_pages
<< PAGE_SHIFT);
}
-static ssize_t store_target(struct device *dev,
+static ssize_t target_store(struct device *dev,
struct device_attribute *attr,
- const char *buf,
- size_t count)
+ const char *buf, size_t count)
{
char *endchar;
unsigned long long target_bytes;
@@ -206,9 +202,7 @@ static ssize_t store_target(struct device *dev,
return count;
}
-static DEVICE_ATTR(target, S_IRUGO | S_IWUSR,
- show_target, store_target);
-
+static DEVICE_ATTR_RW(target);
static struct attribute *balloon_attrs[] = {
&dev_attr_target_kb.attr,