git: cdfdafdc3424 - main - linuxkpi: Define `DEFINE_SHOW_STORE_ATTRIBUTE()`

The branch main has been updated by dumbbell:

URL: https://cgit.FreeBSD.org/src/commit/?id=cdfdafdc34244aced687516a7a0cb04e7b4d267c

commit cdfdafdc34244aced687516a7a0cb04e7b4d267c
Author:     Jean-Sébastien Pédron <dumbbell@FreeBSD.org>
AuthorDate: 2025-06-20 19:50:13 +0000
Commit:     Jean-Sébastien Pédron <dumbbell@FreeBSD.org>
CommitDate: 2025-08-09 12:26:24 +0000

    linuxkpi: Define `DEFINE_SHOW_STORE_ATTRIBUTE()`
    
    It is the same as `DEFINE_SHOW_ATTRIBUTE()` with a `write` function
    added.
    
    The i915 DRM driver started to use it in Linux 6.9.
    
    Reviewed by:    manu
    Sponsored by:   The FreeBSD Foundation
    Differential Revision: https://reviews.freebsd.org/D50992
---
 sys/compat/linuxkpi/common/include/linux/seq_file.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/sys/compat/linuxkpi/common/include/linux/seq_file.h b/sys/compat/linuxkpi/common/include/linux/seq_file.h
index 876ef9e8dfe5..47da16ab8688 100644
--- a/sys/compat/linuxkpi/common/include/linux/seq_file.h
+++ b/sys/compat/linuxkpi/common/include/linux/seq_file.h
@@ -55,6 +55,21 @@ static const struct file_operations __name ## _fops = {			\
 	.release	= single_release,				\
 }
 
+#define	DEFINE_SHOW_STORE_ATTRIBUTE(__name)				\
+static int __name ## _open(struct inode *inode, struct linux_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,					\
+	.write		= __name ## _write,				\
+	.llseek		= seq_lseek,					\
+	.release	= single_release,				\
+}
+
 struct seq_file {
 	struct sbuf *buf;
 	size_t size;