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Date: Thu, 23 Nov 2017 22:36:04 +0200 From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> To: Marcel Holtmann <marcel@...tmann.org>, Johan Hedberg <johan.hedberg@...il.com>, linux-bluetooth@...r.kernel.org, "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> Subject: [PATCH v2 1/2] 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. Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> --- include/linux/seq_file.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h index c32929802c25..73adc12ab773 100644 --- a/include/linux/seq_file.h +++ b/include/linux/seq_file.h @@ -144,6 +144,19 @@ 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 = { \ + .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 -- 2.15.0
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