FROMGIT: binder: add transaction_report feature entry

Add "transaction_report" to the binderfs feature list, to help userspace
determine if the "BINDER_CMD_REPORT" generic netlink api is supported by
the binder driver.

Signed-off-by: Li Li <dualli@google.com>
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20250727182932.2499194-5-cmllamas@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 372832477
(cherry picked from commit f37b55ded8ed35424ebb91a4d012527071e1f601
 git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git char-misc-next)
Change-Id: I0793b68e6f96283d47e3d44dcc68f248495dbcb3
Signed-off-by: Carlos Llamas <cmllamas@google.com>

drivers/android/binderfs.c

@@ -59,6 +59,7 @@ struct binder_features {
 	bool oneway_spam_detection;
 	bool extended_error;
 	bool freeze_notification;
+	bool transaction_report;
 };
 
 static const struct constant_table binderfs_param_stats[] = {
@@ -76,6 +77,7 @@ static struct binder_features binder_features = {
 	.oneway_spam_detection = true,
 	.extended_error = true,
 	.freeze_notification = true,
+	.transaction_report = true,
 };
 
 static inline struct binderfs_info *BINDERFS_SB(const struct super_block *sb)
@@ -616,6 +618,12 @@ static int init_binder_features(struct super_block *sb)
 	if (IS_ERR(dentry))
 		return PTR_ERR(dentry);
 
+	dentry = binderfs_create_file(dir, "transaction_report",
+				      &binder_features_fops,
+				      &binder_features.transaction_report);
+	if (IS_ERR(dentry))
+		return PTR_ERR(dentry);
+
 	return 0;
 }
 

tools/testing/selftests/filesystems/binderfs/binderfs_test.c

@@ -66,6 +66,7 @@ static int __do_binderfs_test(struct __test_metadata *_metadata)
 		"oneway_spam_detection",
 		"extended_error",
 		"freeze_notification",
+		"transaction_report",
 	};
 
 	change_mountns(_metadata);