# git rev-parse -q --verify 48015b632f770c401f3816f144499a39f2884677^{commit}
48015b632f770c401f3816f144499a39f2884677
already have revision, skipping fetch
# git checkout -q -f -B kisskb 48015b632f770c401f3816f144499a39f2884677
# git clean -qxdf
# < git log -1
# commit 48015b632f770c401f3816f144499a39f2884677
# Author: Michael Ellerman <mpe@ellerman.id.au>
# Date:   Fri Feb 11 17:32:37 2022 +1100
# 
#     powerpc: Fix STACKTRACE=n build
#     
#     Our skiroot_defconfig doesn't enable FTRACE, and so doesn't get
#     STACKTRACE enabled either. That leads to a build failure since commit
#     1614b2b11fab ("arch: Make ARCH_STACKWALK independent of STACKTRACE")
#     made stacktrace.c build even when STACKTRACE=n.
#     
#       arch/powerpc/kernel/stacktrace.c: In function ‘handle_backtrace_ipi’:
#       arch/powerpc/kernel/stacktrace.c:171:2: error: implicit declaration of function ‘nmi_cpu_backtrace’
#         171 |  nmi_cpu_backtrace(regs);
#             |  ^~~~~~~~~~~~~~~~~
#       arch/powerpc/kernel/stacktrace.c: In function ‘arch_trigger_cpumask_backtrace’:
#       arch/powerpc/kernel/stacktrace.c:226:2: error: implicit declaration of function ‘nmi_trigger_cpumask_backtrace’
#         226 |  nmi_trigger_cpumask_backtrace(mask, exclude_self, raise_backtrace_ipi);
#             |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#     
#     This happens because our headers haven't defined
#     arch_trigger_cpumask_backtrace, which causes lib/nmi_backtrace.c not to
#     build nmi_cpu_backtrace().
#     
#     The code in question doesn't actually depend on STACKTRACE=y, that was
#     just added because arch_trigger_cpumask_backtrace() lived in
#     stacktrace.c for convenience. So drop the dependency on
#     CONFIG_STACKTRACE, that causes lib/nmi_backtrace.c to build
#     nmi_cpu_backtrace() etc. and fixes the build.
#     
#     Fixes: 1614b2b11fab ("arch: Make ARCH_STACKWALK independent of STACKTRACE")
#     [mpe: Cherry pick of 5a72345e6a78 from next into fixes]
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20220212111349.2806972-1-mpe@ellerman.id.au
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-ld --version
# < git log --format=%s --max-count=1 48015b632f770c401f3816f144499a39f2884677
# < make -s -j 32 ARCH=s390 O=/kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  defconfig
# < make -s -j 32 ARCH=s390 O=/kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  help
# make -s -j 32 ARCH=s390 O=/kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  olddefconfig
# make -s -j 32 ARCH=s390 O=/kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  
  MKDIR     /kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8/tools/bpf/resolve_btfids/libbpf/
  MKDIR     /kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8/tools/bpf/resolve_btfids//libsubcmd
  LINK     resolve_btfids
BTF: .tmp_vmlinux.btf: pahole version v1.12 is too old, need at least v1.16
Failed to generate BTF for vmlinux
Try to disable CONFIG_DEBUG_INFO_BTF
make[1]: *** [/kisskb/src/Makefile:1155: vmlinux] Error 1
make: *** [Makefile:219: __sub-make] Error 2
Command 'make -s -j 32 ARCH=s390 O=/kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  ' returned non-zero exit status 2
# rm -rf /kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8
# Build took: 0:05:32.251029