# git rev-parse -q --verify ffcf9c5700e49c0aee42dcba9a12ba21338e8136^{commit}
ffcf9c5700e49c0aee42dcba9a12ba21338e8136
already have revision, skipping fetch
# git checkout -q -f -B kisskb ffcf9c5700e49c0aee42dcba9a12ba21338e8136
# git clean -qxdf
# < git log -1
# commit ffcf9c5700e49c0aee42dcba9a12ba21338e8136
# Author: Nick Desaulniers <ndesaulniers@google.com>
# Date:   Wed Aug 10 15:24:41 2022 -0700
# 
#     x86: link vdso and boot with -z noexecstack --no-warn-rwx-segments
#     
#     Users of GNU ld (BFD) from binutils 2.39+ will observe multiple
#     instances of a new warning when linking kernels in the form:
#     
#       ld: warning: arch/x86/boot/pmjump.o: missing .note.GNU-stack section implies executable stack
#       ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
#       ld: warning: arch/x86/boot/compressed/vmlinux has a LOAD segment with RWX permissions
#     
#     Generally, we would like to avoid the stack being executable.  Because
#     there could be a need for the stack to be executable, assembler sources
#     have to opt-in to this security feature via explicit creation of the
#     .note.GNU-stack feature (which compilers create by default) or command
#     line flag --noexecstack.  Or we can simply tell the linker the
#     production of such sections is irrelevant and to link the stack as
#     --noexecstack.
#     
#     LLVM's LLD linker defaults to -z noexecstack, so this flag isn't
#     strictly necessary when linking with LLD, only BFD, but it doesn't hurt
#     to be explicit here for all linkers IMO.  --no-warn-rwx-segments is
#     currently BFD specific and only available in the current latest release,
#     so it's wrapped in an ld-option check.
#     
#     While the kernel makes extensive usage of ELF sections, it doesn't use
#     permissions from ELF segments.
#     
#     Link: https://lore.kernel.org/linux-block/3af4127a-f453-4cf7-f133-a181cce06f73@kernel.dk/
#     Link: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=ba951afb99912da01a6e8434126b8fac7aa75107
#     Link: https://github.com/llvm/llvm-project/issues/57009
#     Reported-and-tested-by: Jens Axboe <axboe@kernel.dk>
#     Suggested-by: Fangrui Song <maskray@google.com>
#     Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-gcc --version
# < /opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-ld --version
# < git log --format=%s --max-count=1 ffcf9c5700e49c0aee42dcba9a12ba21338e8136
# < make -s -j 40 ARCH=microblaze O=/kisskb/build/linus_mmu_defconfig_microblaze-gcc5 CROSS_COMPILE=/opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-  mmu_defconfig
# < make -s -j 40 ARCH=microblaze O=/kisskb/build/linus_mmu_defconfig_microblaze-gcc5 CROSS_COMPILE=/opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-  help
# make -s -j 40 ARCH=microblaze O=/kisskb/build/linus_mmu_defconfig_microblaze-gcc5 CROSS_COMPILE=/opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-  olddefconfig
# make -s -j 40 ARCH=microblaze O=/kisskb/build/linus_mmu_defconfig_microblaze-gcc5 CROSS_COMPILE=/opt/cross/kisskb/br-microblaze-full-2016.08-613-ge98b4dd/bin/microblazeel-linux-  
Kernel: arch/microblaze/boot/linux.bin is ready  (#1)
Completed OK
# rm -rf /kisskb/build/linus_mmu_defconfig_microblaze-gcc5
# Build took: 0:00:28.592229