# git rev-parse -q --verify 0afaf52eff136daf4edc2aac3dc9793fa247ed0c^{commit}
0afaf52eff136daf4edc2aac3dc9793fa247ed0c
already have revision, skipping fetch
# git checkout -q -f -B kisskb 0afaf52eff136daf4edc2aac3dc9793fa247ed0c
# git clean -qxdf
# < git log -1
# commit 0afaf52eff136daf4edc2aac3dc9793fa247ed0c
# Author: HONG Yifan <elsk@google.com>
# Date:   Wed Jul 17 01:50:41 2024 +0000
# 
#     kconfig: recursive checks drop file/lineno
#     
#     This prevents segfault when getting filename and lineno in recursive
#     checks.
#     
#     If the following snippet is found in Kconfig:
#     
#     [Test code 1]
#     
#     config FOO
#             bool
#             depends on BAR
#             select BAR
#     
#     ... without BAR defined; then there is a segfault.
#     
#       Kconfig:34:error: recursive dependency detected!
#       Kconfig:34:   symbol FOO depends on BAR
#       make[4]: *** [scripts/kconfig/Makefile:85: allnoconfig] Segmentation fault
#     
#     This is because of the following. BAR is a fake entry created by
#     sym_lookup() with prop being NULL. In the recursive check, there is a
#     NULL check for prop to fall back to stack->sym->prop if stack->prop is
#     NULL. However, in this case, stack->sym points to the fake BAR entry
#     created by sym_lookup(), so prop is still NULL. prop was then referenced
#     without additional NULL checks, causing segfault.
#     
#     As the previous email thread suggests, the file and lineno for select is
#     also wrong:
#     
#     [Test code 2]
#     
#     config FOO
#            bool
#     
#     config BAR
#            bool
#     
#     config FOO
#            bool "FOO"
#            depends on BAR
#            select BAR
#     
#       $ make defconfig
#       *** Default configuration is based on 'x86_64_defconfig'
#       Kconfig:1:error: recursive dependency detected!
#       Kconfig:1: symbol FOO depends on BAR
#       Kconfig:4: symbol BAR is selected by FOO
#       [...]
#     
#     Kconfig:4 should be Kconfig:10.
#     
#     This patch deletes the wrong and segfault-prone filename/lineno
#     inference completely. With this patch, Test code 1 yields:
#     
#     error: recursive dependency detected!
#             symbol FOO depends on BAR
#             symbol BAR is selected by FOO
#     
#     Signed-off-by: HONG Yifan <elsk@google.com>
#     Signed-off-by: Masahiro Yamada <masahiroy@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 0afaf52eff136daf4edc2aac3dc9793fa247ed0c
# make -s -j 40 ARCH=powerpc O=/kisskb/build/kbuild_powernv_defconfig+NO_PERF_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  powernv_defconfig
# Added to kconfig CONFIG_PERF_EVENTS=n
# < make -s -j 40 ARCH=powerpc O=/kisskb/build/kbuild_powernv_defconfig+NO_PERF_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 40 ARCH=powerpc O=/kisskb/build/kbuild_powernv_defconfig+NO_PERF_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 40 ARCH=powerpc O=/kisskb/build/kbuild_powernv_defconfig+NO_PERF_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_powernv_defconfig+NO_PERF_powerpc-gcc5
# Build took: 0:01:46.217557