在向AOSP配置添加新符号时，silentoldconfig无法构建

Question

我正在尝试将linux内核驱动程序添加到android源代码中。

我将它添加到要构建的配置文件中（kernel / msm-4.9 / arch / arm64 / config / sdm845_defconfig）。

CONFIG_LEDS_QPNP_WLED=y
# CONFIG_LEDS_QPNP_HAPTICS is not set
CONFIG_HAPTICS_MISC=y

kernel / msm-4.9 / drivers / misc /中的makefile和Kconfig文件也会更新以包含驱动程序。

Makefile文件：

haptics-misc-objs := haptics-misc.o hatpics-misc-tables.o
obj-$(CONFIG_HAPTICS_MISC)   += haptics-misc.o

的Kconfig：

config HAPTICS_MISC
        tristate "Haptics driver"
        depends on I2C && SYSFS && NEW_LEDS
        help
          Boosted Haptics Driver

我尝试使用以下步骤构建内核：

 $ source build/envsetup.sh
 $ lunch 41
    ============================================
    PLATFORM_VERSION_CODENAME=REL
    PLATFORM_VERSION=8.1.0
    TARGET_PRODUCT=sdm845
    TARGET_BUILD_VARIANT=userdebug
    TARGET_BUILD_TYPE=release
    TARGET_PLATFORM_VERSION=OPM1
    TARGET_BUILD_APPS=
    TARGET_ARCH=arm64
    TARGET_ARCH_VARIANT=armv8-a
    TARGET_CPU_VARIANT=kryo300
    TARGET_2ND_ARCH=arm
    TARGET_2ND_ARCH_VARIANT=armv7-a-neon
    TARGET_2ND_CPU_VARIANT=cortex-a9
    HOST_ARCH=x86_64
    HOST_2ND_ARCH=x86
    HOST_OS=linux
    HOST_OS_EXTRA=Linux-4.15.0-24-generic-x86_64-with-Ubuntu-16.04-xenial
    HOST_CROSS_OS=windows
    HOST_CROSS_ARCH=x86
    HOST_CROSS_2ND_ARCH=x86_64
    HOST_BUILD_TYPE=release
    BUILD_ID=OPM1.171019.026
    OUT_DIR=out
    AUX_OS_VARIANT_LIST=

   $ make -j12 

构建失败，并出现以下错误：

Haptics driver (HAPTICS_MISC) [N/m/y/?] (NEW) aborted!

Console input/output is redirected. Run 'make oldconfig' to update configuration.

/media/ftreven/quarter-b/Open-Q_845_Android-O_v1.0/Source_Package/SDA845_Open-Q_845_Android-O_v1.0/kernel/msm-4.9/scripts/kconfig/Makefile:37: recipe for target 'silentoldconfig' failed
make[3]: *** [silentoldconfig] Error 1
/media/ftreven/quarter-b/Open-Q_845_Android-O_v1.0/Source_Package/SDA845_Open-Q_845_Android-O_v1.0/kernel/msm-4.9/Makefile:550: recipe for target 'silentoldconfig' failed
make[2]: *** [silentoldconfig] Error 2
make[1]: *** No rule to make target 'include/config/auto.conf', needed by 'include/config/kernel.release'.  Stop.
make[1]: Leaving directory '/media/ftreven/quarter-b/Open-Q_845_Android-O_v1.0/Source_Package/SDA845_Open-Q_845_Android-O_v1.0/out/target/product/sdm845/obj/kernel/msm-4.9'
Makefile:150: recipe for target 'sub-make' failed
make: *** [sub-make] Error 2

从错误消息看来，命令仅因为符号是新的而失败。它建议使用oldconfig，但这也会失败：

$ make oldconfig
ninja: error: unknown target 'oldconfig', did you mean 'fmconfig'?
13:08:18 ninja failed with: exit status 1

#### failed to build some targets (38 seconds) ####

我不确定“fmconfig”是什么，但我尝试按照建议构建它并且它成功了。但是，尝试构建整个内核失败的原因与上述相同。知道是什么原因引起的吗？它是在添加新符号之前成功构建的。

Answer 1

我发现Linux内核版本4.9发布后，android框架停止允许内置驱动程序。为了解决这个问题，我不得不将驱动程序构建为动态可加载内核模块。为此，我在vendor / called dlkm /下创建了一个目录，其中我放置了所有源代码和configs / Makefile。

完成此操作后，我可以成功构建源代码。

$ source build/envsetup.sh
$ lunch 41
$ make -j12


#### build completed successfully (03:38 (mm:ss)) ###

在android框架的实际内核部分中不能引用驱动程序，否则构建将失败。例外情况是设备树（.dtsi，.dts文件）仍将在内核中构建。