[PATCH v9 2/2] binder: frozen notification binder_features flag

[Yu-Ting Tseng <yutingtseng@google.com>]

Add a flag to binder_features to indicate that the freeze notification
feature is available.

Signed-off-by: Yu-Ting Tseng <yutingtseng@google.com>
Acked-by: Carlos Llamas <cmllamas@google.com>
---
V8 -> V9: Add patchset summary and changelogs.
V7 -> V8: Resending patchset to the correct list of recipients.
V6 -> V7: Resending patchset without --in-reply-to.
V5 -> V6: Separated the binder_features change into its own patch in the
          same patchset.
V4 -> V5: Merged the binder_features change into the same patch.
V3 -> V4: N/A
V2 -> V3: N/A
V1 -> V2: N/A

 drivers/android/binderfs.c                                | 8 ++++++++
 .../selftests/filesystems/binderfs/binderfs_test.c        | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/android/binderfs.c b/drivers/android/binderfs.c
index 3001d754ac36..ad1fa7abc323 100644
--- a/drivers/android/binderfs.c
+++ b/drivers/android/binderfs.c
@@ -58,6 +58,7 @@ enum binderfs_stats_mode {
 struct binder_features {
 	bool oneway_spam_detection;
 	bool extended_error;
+	bool freeze_notification;
 };
 
 static const struct constant_table binderfs_param_stats[] = {
@@ -74,6 +75,7 @@ static const struct fs_parameter_spec binderfs_fs_parameters[] = {
 static struct binder_features binder_features = {
 	.oneway_spam_detection = true,
 	.extended_error = true,
+	.freeze_notification = true,
 };
 
 static inline struct binderfs_info *BINDERFS_SB(const struct super_block *sb)
@@ -608,6 +610,12 @@ static int init_binder_features(struct super_block *sb)
 	if (IS_ERR(dentry))
 		return PTR_ERR(dentry);
 
+	dentry = binderfs_create_file(dir, "freeze_notification",
+				      &binder_features_fops,
+				      &binder_features.freeze_notification);
+	if (IS_ERR(dentry))
+		return PTR_ERR(dentry);
+
 	return 0;
 }
 
diff --git a/tools/testing/selftests/filesystems/binderfs/binderfs_test.c b/tools/testing/selftests/filesystems/binderfs/binderfs_test.c
index 5f362c0fd890..319567f0fae1 100644
--- a/tools/testing/selftests/filesystems/binderfs/binderfs_test.c
+++ b/tools/testing/selftests/filesystems/binderfs/binderfs_test.c
@@ -65,6 +65,7 @@ static int __do_binderfs_test(struct __test_metadata *_metadata)
 	static const char * const binder_features[] = {
 		"oneway_spam_detection",
 		"extended_error",
+		"freeze_notification",
 	};
 
 	change_mountns(_metadata);
-- 
2.45.2.803.g4e1b14247a-goog