Re: [PATCH] binder: Fix up Kconfig dependancy due to removal of .c code

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Wed, Sep 16, 2026 at 08:03:54PM +0100, Greg Kroah-Hartman wrote:
> When the .c binder code was removed, building the kernel if the rust
> binder code was enabled, will cause the binder to not be built at all as
> the option changed from .c to .rs which is probably not what the
> original build wanted.
> 
> Fix this up by renaming the option back to the _RUST version.  If in the
> future, that suffix wants to be dropped, we can do so and then it will
> be prompted for a choice again, but for this release cycle, it should
> stay as-is.
> 
> Fixes: binder: rm -f binder.c
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>  drivers/android/Kconfig                                      | 4 ++--
>  drivers/android/Makefile                                     | 2 +-
>  drivers/android/binder/Makefile                              | 2 +-
>  tools/testing/selftests/filesystems/binderfs/binderfs_test.c | 2 +-
>  tools/testing/selftests/filesystems/binderfs/config          | 2 +-
>  5 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/android/Kconfig b/drivers/android/Kconfig
> index 403e5f3eab5a..c920d52c0221 100644
> --- a/drivers/android/Kconfig
> +++ b/drivers/android/Kconfig
> @@ -1,7 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0
>  menu "Android"
>  
> -config ANDROID_BINDER_IPC
> +config ANDROID_BINDER_IPC_RUST
>  	bool "Android Binder IPC Driver"
>  	depends on MMU
>  	depends on NET
> @@ -17,7 +17,7 @@ config ANDROID_BINDER_IPC
>  
>  config ANDROID_BINDER_DEVICES
>  	string "Android Binder devices"
> -	depends on ANDROID_BINDER_IPC
> +	depends on ANDROID_BINDER_IPC_RUST
>  	default "binder,hwbinder,vndbinder"
>  	help
>  	  Default value for the binder.devices parameter.
> diff --git a/drivers/android/Makefile b/drivers/android/Makefile
> index dc19d21037af..5bc644cf5e0c 100644
> --- a/drivers/android/Makefile
> +++ b/drivers/android/Makefile
> @@ -1,4 +1,4 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  ccflags-y += -I$(src)			# needed for trace events
>  
> -obj-$(CONFIG_ANDROID_BINDER_IPC)	+= binder/
> +obj-$(CONFIG_ANDROID_BINDER_IPC_RUST_RUST)	+= binder/
> diff --git a/drivers/android/binder/Makefile b/drivers/android/binder/Makefile
> index 661f5cca8918..fe474628a94e 100644
> --- a/drivers/android/binder/Makefile
> +++ b/drivers/android/binder/Makefile
> @@ -1,7 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  ccflags-y += -I$(src)	# needed for trace events
>  
> -obj-$(CONFIG_ANDROID_BINDER_IPC) += binder.o
> +obj-$(CONFIG_ANDROID_BINDER_IPC_RUST) += binder.o
>  binder-y := \
>  	rust_binder_main.o	\
>  	rust_binderfs.o		\
> diff --git a/tools/testing/selftests/filesystems/binderfs/binderfs_test.c b/tools/testing/selftests/filesystems/binderfs/binderfs_test.c
> index 7310622098ff..cd82c89f558f 100644
> --- a/tools/testing/selftests/filesystems/binderfs/binderfs_test.c
> +++ b/tools/testing/selftests/filesystems/binderfs/binderfs_test.c
> @@ -414,7 +414,7 @@ TEST(binderfs_stress)
>  
>  		ret = mount(NULL, binderfs_mntpt, "binder", 0, 0);
>  		ASSERT_EQ(ret, 0) {
> -			TH_LOG("%s - Failed to mount binderfs, check if CONFIG_ANDROID_BINDER_IPC is enabled in the running kernel",
> +			TH_LOG("%s - Failed to mount binderfs, check if CONFIG_ANDROID_BINDER_IPC_RUST is enabled in the running kernel",
>  				strerror(errno));
>  		}
>  
> diff --git a/tools/testing/selftests/filesystems/binderfs/config b/tools/testing/selftests/filesystems/binderfs/config
> index e0c1958a3675..80e4221c2d82 100644
> --- a/tools/testing/selftests/filesystems/binderfs/config
> +++ b/tools/testing/selftests/filesystems/binderfs/config
> @@ -1 +1 @@
> -CONFIG_ANDROID_BINDER_IPC=y
> +CONFIG_ANDROID_BINDER_IPC_RUST=y
> -- 
> 2.55.0
> 

This fixes up my build issues, can you test it out before/after applying
the removal patch and see if it keeps building the rust binder properly?

thanks,

greg k-h