From 6b9a49e33cad9af951620c2f8417b721c5e08854 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 22 Jan 2018 18:05:43 +0200 Subject: [PATCH] UPSTREAM: 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 Acked-by: Darren Hart (VMware) Signed-off-by: Andy Shevchenko Bug: 136497735 (cherry picked from commit a08f06bb7a0743a7fc8d571899c93d882468096e) Change-Id: Ib60cf57dc5e979915a83848919644150d82e7058 Signed-off-by: Hridya Valsaraju --- include/linux/seq_file.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h index e305b66a9fb9..d75248d81499 100644 --- a/include/linux/seq_file.h +++ b/include/linux/seq_file.h @@ -139,6 +139,20 @@ 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 -- 2.20.1