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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2018-01-22 18:05:43 +0200
committerAndy Shevchenko <andriy.shevchenko@linux.intel.com>2018-02-07 12:50:21 +0200
commita08f06bb7a0743a7fc8d571899c93d882468096e (patch)
tree27168380ec79b56895dbce004ffe940d0065450d /include
parenta2e5790d841658485d642196dbb0927303d6c22f (diff)
seq_file: Introduce DEFINE_SHOW_ATTRIBUTE() helper macro
The DEFINE_SHOW_ATTRIBUTE() helper macro would be useful for current users, which are many of them, and for new comers to decrease code duplication. Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Darren Hart (VMware) <dvhart@infradead.org> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/seq_file.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
index 09c6e28746f9..ab437dd2e3b9 100644
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -140,6 +140,20 @@ void *__seq_open_private(struct file *, const struct seq_operations *, int);
int seq_open_private(struct file *, const struct seq_operations *, int);
int seq_release_private(struct inode *, struct file *);
+#define DEFINE_SHOW_ATTRIBUTE(__name) \
+static int __name ## _open(struct inode *inode, struct file *file) \
+{ \
+ return single_open(file, __name ## _show, inode->i_private); \
+} \
+ \
+static const struct file_operations __name ## _fops = { \
+ .owner = THIS_MODULE, \
+ .open = __name ## _open, \
+ .read = seq_read, \
+ .llseek = seq_lseek, \
+ .release = single_release, \
+}
+
static inline struct user_namespace *seq_user_ns(struct seq_file *seq)
{
#ifdef CONFIG_USER_NS

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