| |
| # |
| # How to build the KMI ABI test kernel module, kmi_sym.ko |
| # |
| |
| 1. Set up the GKI source. |
| # Set up and export GKI_DIR to be used for kernel module building |
| $ cd $GKI_DIR |
| $ repo init -u https://android.googlesource.com/kernel/manifest \ |
| -b common-android12-5.10 |
| $ repo sync |
| See "GKI Monthly Branch Handbook" for details. |
| 2. Build arm64 GKI under $GKI_DIR |
| $ BUILD_CONFIG=common/build.config.gki.aarch64 build/build.sh -j16 |
| 3. Download a supported kernel symbol file, vmlinux.symvers, from GKI AB: |
| $ export GKI_BID=7618735 |
| https://ci.android.com/builds/submitted/$GKI_BID/kernel_aarch64/latest |
| $ cp vmlinux.symvers $ANDROID_BUILD_TOP/development/gki/kmi_abi_chk/vmlinux.symvers-$GKI_BID |
| 4. Replace the Module.symvers just built with the supported kernel symbol file. |
| $ cp vmlinux.symvers $GKI_DIR/out/android12-5.10/common/Module.symvers |
| 5. Create the KMI symbol list include file: |
| $ cd development/gki/kmi_abi_chk |
| $ cp $GKI_DIR/out/android12-5.10/common/Module.symvers vmlinux.symvers-$GKI_BID |
| $ awk '{printf("\t.xword\t%s\n",$2)}' vmlinux.symvers-$GKI_BID >> kmi_sym_list-$GKI_BID.inc |
| Note that kmi_sym_list-7618735.inc included in the current directory is a |
| version modified from the one based on vmlinux.symvers of build 7618735, the |
| initial GKI 5.10 released in July, 2021. Search b/197035344 for details. |
| 6. Build the kernel module |
| $ make ARCH=arm64 CROSS_COMPILE=aarch64 LLVM=1 LLVM_IAS=1 LTO=thin |
| |
| A few prebuilt test kernel modules, kmi_sym-*.ko, for arm64 GKI 5.10 |
| 2021-07 and later builds is included under prebuilts/ directory. |
| |
| # |
| # How to use/run KMI test kernel module, kmi_sym.ko, on GKI |
| # |
| |
| 1. Copy the test kernel module to the Android device |
| $ adb push kmi_sym.ko /data/local/tmp |
| 2. "Root" the Android device we'd like to run the test |
| $ adb root |
| 3. Check the kernel information on the device |
| emulator64_arm64:/ # uname -a |
| Linux localhost 5.10.43-android12-9-00005-g376ecc372342-ab7614753 #1 SMP PREEMPT Thu Aug 5 15:12:49 UTC 2021 aarch64 |
| 4. Load the test kernel module |
| emulator64_arm64:/ # lsmod | grep kmi_sym |
| emulator64_arm64:/ # insmod /data/local/tmp/kmi_sym.ko; echo $? |
| 0 |
| 5. Verify the test kernel module is loaded successfully |
| emulator64_arm64:/ # lsmod | grep kmi_sym |
| kmi_sym 57344 0 |
| emulator64_arm64:/ # dmesg | grep KMI |
| [ 1669.833480] 5317 KMI ABI symbols at 00000000d34c59ea |
| 6. Unload the test kernel module |
| emulator64_arm64:/ # rmmod kmi_sym; echo $? |
| 0 |
| emulator64_arm64:/ # dmesg | grep KMI |
| [ 1669.833480] 5317 KMI ABI symbols at 00000000d34c59ea |
| [ 1860.571944] Cleaning up KMI ABI. |