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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2018-01-22 18:05:43 +0200 |
|---|---|---|
| committer | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2018-02-07 12:50:21 +0200 |
| commit | a08f06bb7a0743a7fc8d571899c93d882468096e (patch) | |
| tree | 27168380ec79b56895dbce004ffe940d0065450d /include/linux/seq_file.h | |
| parent | a2e5790d841658485d642196dbb0927303d6c22f (diff) | |
| download | lwn-a08f06bb7a0743a7fc8d571899c93d882468096e.tar.gz lwn-a08f06bb7a0743a7fc8d571899c93d882468096e.zip | |
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/linux/seq_file.h')
| -rw-r--r-- | include/linux/seq_file.h | 14 |
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 |