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From: Ben Hutchings <ben@decadent.org.uk>
Date: Tue, 08 Jul 2025 13:30:55 +0200
Subject: android: Enable building binder as module
Bug-Debian: https://bugs.debian.org/901492
We want to enable use of the Android binder driver to support
Waydroid, but it should not be built-in as that would waste resources
and increase security attack surface on systems that don't need it.
- Change the Makefiles to build the driver as an object with the
"_linux" suffix (which is what Waydroid expects)
- Change config symbol types to tristate
- Add a module description, because modpost warns about missing
descriptions
---
drivers/android/Kconfig | 2 +-
drivers/android/Makefile | 7 ++++---
drivers/android/binder_alloc.c | 2 +-
3 files changed, 6 insertions(+), 5 deletions(-)
--- a/drivers/android/Kconfig
+++ b/drivers/android/Kconfig
@@ -2,7 +2,7 @@
menu "Android"
config ANDROID_BINDER_IPC
- bool "Android Binder IPC Driver"
+ tristate "Android Binder IPC Driver"
depends on MMU
depends on NET
default n
--- a/drivers/android/Makefile
+++ b/drivers/android/Makefile
@@ -1,7 +1,8 @@
# SPDX-License-Identifier: GPL-2.0-only
ccflags-y += -I$(src) # needed for trace events
-obj-$(CONFIG_ANDROID_BINDERFS) += binderfs.o
-obj-$(CONFIG_ANDROID_BINDER_IPC) += binder.o binder_alloc.o binder_netlink.o
-obj-$(CONFIG_ANDROID_BINDER_ALLOC_KUNIT_TEST) += tests/
+obj-$(CONFIG_ANDROID_BINDER_IPC) += binder_linux.o
+binder_linux-y := binder.o binder_alloc.o binder_netlink.o
+binder_linux-$(CONFIG_ANDROID_BINDERFS) += binderfs.o
+binder_linux-$(CONFIG_ANDROID_BINDER_ALLOC_KUNIT_TEST) += tests/
obj-$(CONFIG_ANDROID_BINDER_IPC_RUST) += binder/
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -7164,3 +7164,6 @@
#define CREATE_TRACE_POINTS
#include "binder_trace.h"
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Android Binder IPC Driver");
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -39,7 +39,7 @@
};
static uint32_t binder_alloc_debug_mask = BINDER_DEBUG_USER_ERROR;
-module_param_named(debug_mask, binder_alloc_debug_mask,
+module_param_named(alloc_debug_mask, binder_alloc_debug_mask,
uint, 0644);
#define binder_alloc_debug(mask, x...) \
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