linux-kernel - Re: [PATCH v1] binder: frozen notification binder

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Message-ID: <ZoTSuNwhcOOeaabW@google.com>
Date: Wed, 3 Jul 2024 04:25:28 +0000
From: Carlos Llamas <cmllamas@...gle.com>
To: Yu-Ting Tseng <yutingtseng@...gle.com>
Cc: tkjos@...gle.com, gregkh@...uxfoundation.org, arve@...roid.com,
	maco@...roid.com, joel@...lfernandes.org, brauner@...nel.org,
	surenb@...gle.com, aliceryhl@...gle.com, kernel-team@...roid.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] binder: frozen notification binder_features flag

On Tue, Jul 02, 2024 at 04:04:54PM -0700, Yu-Ting Tseng wrote:
> Add a flag to binder_features to indicate that the freeze notification
> feature is available.
> ---
>  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
> 


This looks good to me. However it should be sent along with your other
freeze notification patch (the two patches in a single patchset). Feel
free to add this for the next version:

Acked-by: Carlos Llamas <cmllamas@...gle.com>

Thanks,
Carlos Llamas