# git rev-parse -q --verify e5d523f1ae8f2cef01f8e071aeee432654166708^{commit}
e5d523f1ae8f2cef01f8e071aeee432654166708
already have revision, skipping fetch
# git checkout -q -f -B kisskb e5d523f1ae8f2cef01f8e071aeee432654166708
# git clean -qxdf
# < git log -1
# commit e5d523f1ae8f2cef01f8e071aeee432654166708
# Author: Nick Desaulniers <ndesaulniers@google.com>
# Date:   Thu Jul 14 13:56:43 2022 -0700
# 
#     ubsan: disable UBSAN_DIV_ZERO for clang
#     
#     Building with UBSAN_DIV_ZERO with clang produces numerous fallthrough
#     warnings from objtool.
#     
#     In the case of uncheck division, UBSAN_DIV_ZERO may introduce new
#     control flow to check for division by zero.
#     
#     Because the result of the division is undefined, LLVM may optimize the
#     control flow such that after the call to __ubsan_handle_divrem_overflow
#     doesn't matter.  If panic_on_warn was set,
#     __ubsan_handle_divrem_overflow would panic.
#     
#     The problem is is that panic_on_warn is run time configurable.  If it's
#     disabled, then we cannot guarantee that we will be able to recover
#     safely.  Disable this config for clang until we can come up with a
#     solution in LLVM.
#     
#     Link: https://github.com/ClangBuiltLinux/linux/issues/1657
#     Link: https://github.com/llvm/llvm-project/issues/56289
#     Link: https://lore.kernel.org/lkml/CAHk-=wj1qhf7y3VNACEexyp5EbkNpdcu_542k-xZpzmYLOjiCg@mail.gmail.com/
#     Reported-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
#     Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
#     Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
#     Acked-by: Nathan Chancellor <nathan@kernel.org>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/hppa-linux/bin/hppa-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/hppa-linux/bin/hppa-linux-ld --version
# < git log --format=%s --max-count=1 e5d523f1ae8f2cef01f8e071aeee432654166708
# < make -s -j 32 ARCH=parisc O=/kisskb/build/linus_parisc-allmodconfig_parisc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/hppa-linux/bin/hppa-linux-  allmodconfig
# Added to kconfig CONFIG_BUILD_DOCSRC=n
# Added to kconfig CONFIG_MODULE_SIG=n
# Added to kconfig CONFIG_SAMPLES=n
# < make -s -j 32 ARCH=parisc O=/kisskb/build/linus_parisc-allmodconfig_parisc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/hppa-linux/bin/hppa-linux-  help
# make -s -j 32 ARCH=parisc O=/kisskb/build/linus_parisc-allmodconfig_parisc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/hppa-linux/bin/hppa-linux-  olddefconfig
# make -s -j 32 ARCH=parisc O=/kisskb/build/linus_parisc-allmodconfig_parisc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/hppa-linux/bin/hppa-linux-  
/kisskb/src/arch/parisc/kernel/vdso32/Makefile:30: FORCE prerequisite is missing
Completed OK
# rm -rf /kisskb/build/linus_parisc-allmodconfig_parisc-gcc11
# Build took: 0:25:27.752819