[PATCH v1] mm: Re-use DEFINE_SHOW_ATTRIBUTE() macro

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

...instead of open coding file operations followed by custom ->open()
callbacks per each attribute.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 mm/backing-dev.c  | 12 +-----------
 mm/memblock.c     | 12 +-----------
 mm/percpu-stats.c | 12 +-----------
 mm/zsmalloc.c     | 12 +-----------
 4 files changed, 4 insertions(+), 44 deletions(-)

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index ffa0c6b9e78a..71292de5f026 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -101,17 +101,7 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v)
 	return 0;
 }
 
-static int bdi_debug_stats_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, bdi_debug_stats_show, inode->i_private);
-}
-
-static const struct file_operations bdi_debug_stats_fops = {
-	.open		= bdi_debug_stats_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(bdi_debug_stats);
 
 static int bdi_debug_register(struct backing_dev_info *bdi, const char *name)
 {
diff --git a/mm/memblock.c b/mm/memblock.c
index 5a9ca2a1751b..c2e5925ebdc4 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1847,17 +1847,7 @@ static int memblock_debug_show(struct seq_file *m, void *private)
 	return 0;
 }
 
-static int memblock_debug_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, memblock_debug_show, inode->i_private);
-}
-
-static const struct file_operations memblock_debug_fops = {
-	.open = memblock_debug_open,
-	.read = seq_read,
-	.llseek = seq_lseek,
-	.release = single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(memblock_debug);
 
 static int __init memblock_init_debugfs(void)
 {
diff --git a/mm/percpu-stats.c b/mm/percpu-stats.c
index 7a58460bfd27..0305cc4cbc3e 100644
--- a/mm/percpu-stats.c
+++ b/mm/percpu-stats.c
@@ -224,17 +224,7 @@ static int percpu_stats_show(struct seq_file *m, void *v)
 	return 0;
 }
 
-static int percpu_stats_open(struct inode *inode, struct file *filp)
-{
-	return single_open(filp, percpu_stats_show, NULL);
-}
-
-static const struct file_operations percpu_stats_fops = {
-	.open		= percpu_stats_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(percpu_stats);
 
 static int __init init_percpu_stats_debugfs(void)
 {
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index c3013505c305..1b5cea3fe9fe 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -642,17 +642,7 @@ static int zs_stats_size_show(struct seq_file *s, void *v)
 	return 0;
 }
 
-static int zs_stats_size_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, zs_stats_size_show, inode->i_private);
-}
-
-static const struct file_operations zs_stat_size_ops = {
-	.open           = zs_stats_size_open,
-	.read           = seq_read,
-	.llseek         = seq_lseek,
-	.release        = single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(zs_stats_size);
 
 static void zs_pool_stat_create(struct zs_pool *pool, const char *name)
 {
-- 
2.15.1

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