# git rev-parse -q --verify e27f421503972af88df6af77d0059bad0aa7616a^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/mirror/linux-kbuild.git for-next
remote: warning: multi-pack bitmap is missing required reverse index        
# git rev-parse -q --verify e27f421503972af88df6af77d0059bad0aa7616a^{commit}
e27f421503972af88df6af77d0059bad0aa7616a
# git checkout -q -f -B kisskb e27f421503972af88df6af77d0059bad0aa7616a
# git clean -qxdf
# < git log -1
# commit e27f421503972af88df6af77d0059bad0aa7616a
# Author: Masahiro Yamada <masahiroy@kernel.org>
# Date:   Mon Jun 10 20:25:18 2024 +0900
# 
#     kbuild: merge temporary vmlinux for BTF and kallsyms
#     
#     CONFIG_DEBUG_INFO_BTF=y requires one additional link step.
#     (.tmp_vmlinux.btf)
#     
#     CONFIG_KALLSYMS=y requires two additional link steps.
#     (.tmp_vmlinux.kallsyms1 and .tmp_vmlinux.kallsyms2)
#     
#     Enabling both requires three additional link steps.
#     
#     When CONFIG_DEBUG_INFO_BTF=y and CONFIG_KALLSYMS=y, the current build
#     process is as follows:
#     
#         KSYMS   .tmp_vmlinux.kallsyms0.S
#         AS      .tmp_vmlinux.kallsyms0.o
#         LD      .tmp_vmlinux.btf             # temporary vmlinux for BTF
#         BTF     .btf.vmlinux.bin.o
#         LD      .tmp_vmlinux.kallsyms1       # temporary vmlinux for kallsyms step 1
#         NM      .tmp_vmlinux.kallsyms1.syms
#         KSYMS   .tmp_vmlinux.kallsyms1.S
#         AS      .tmp_vmlinux.kallsyms1.o
#         LD      .tmp_vmlinux.kallsyms2       # temporary vmlinux for kallsyms step 2
#         NM      .tmp_vmlinux.kallsyms2.syms
#         KSYMS   .tmp_vmlinux.kallsyms2.S
#         AS      .tmp_vmlinux.kallsyms2.o
#         LD      vmlinux                      # final vmlinux
#     
#     This is redundant because the BTF generation and the kallsyms step 1 can
#     be performed against the same temporary vmlinux.
#     
#     When both CONFIG_DEBUG_INFO_BTF and CONFIG_KALLSYMS are enabled, we can
#     reduce the number of link steps by one.
#     
#     This commit changes the build process as follows:
#     
#         KSYMS   .tmp_vmlinux0.kallsyms.S
#         AS      .tmp_vmlinux0.kallsyms.o
#         LD      .tmp_vmlinux1                # temporary vmlinux for BTF and kallsyms step 1
#         BTF     .tmp_vmlinux1.btf.o
#         NM      .tmp_vmlinux1.syms
#         KSYMS   .tmp_vmlinux1.kallsyms.S
#         AS      .tmp_vmlinux1.kallsyms.o
#         LD      .tmp_vmlinux2                # temporary vmlinux for kallsyms step 2
#         NM      .tmp_vmlinux2.syms
#         KSYMS   .tmp_vmlinux2.kallsyms.S
#         AS      .tmp_vmlinux2.kallsyms.o
#         LD      vmlinux                      # final vmlinux
#     
#     Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
#     Acked-by: Andrii Nakryiko <andrii@kernel.org>
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 e27f421503972af88df6af77d0059bad0aa7616a
# make -s -j 24 ARCH=powerpc O=/kisskb/build/kbuild_44x_fsp2_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  44x/fsp2_defconfig
# < make -s -j 24 ARCH=powerpc O=/kisskb/build/kbuild_44x_fsp2_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 24 ARCH=powerpc O=/kisskb/build/kbuild_44x_fsp2_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 24 ARCH=powerpc O=/kisskb/build/kbuild_44x_fsp2_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
Completed OK
# rm -rf /kisskb/build/kbuild_44x_fsp2_defconfig_powerpc-gcc5
# Build took: 0:02:03.423294