# git rev-parse -q --verify 13cb73490f475f8e7669f9288be0bcfa85399b1f^{commit}
# git fetch -q -n -f git://fs.ozlabs.ibm.com/kernel/linus master
# git rev-parse -q --verify 13cb73490f475f8e7669f9288be0bcfa85399b1f^{commit}
13cb73490f475f8e7669f9288be0bcfa85399b1f
# git checkout -q -f -B kisskb 13cb73490f475f8e7669f9288be0bcfa85399b1f
# git clean -qxdf
# < git log -1
# commit 13cb73490f475f8e7669f9288be0bcfa85399b1f
# Merge: cc7343724eb7 d53d9bc0cf78
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Mon Oct 12 12:05:24 2020 -0700
# 
#     Merge tag 'x86-entry-2020-10-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
#     
#     Pull x86 entry code updates from Thomas Gleixner:
#      "More consolidation and correctness fixes for the debug exception:
#     
#        - Ensure BTF synchronization under all circumstances
#     
#        - Distangle kernel and user mode #DB further
#     
#        - Get ordering vs. the debug notifier correct to make KGDB work more
#          reliably.
#     
#        - Cleanup historical gunk and make the code simpler to understand"
#     
#     * tag 'x86-entry-2020-10-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
#       x86/debug: Change thread.debugreg6 to thread.virtual_dr6
#       x86/debug: Support negative polarity DR6 bits
#       x86/debug: Simplify hw_breakpoint_handler()
#       x86/debug: Remove aout_dump_debugregs()
#       x86/debug: Remove the historical junk
#       x86/debug: Move cond_local_irq_enable() block into exc_debug_user()
#       x86/debug: Move historical SYSENTER junk into exc_debug_kernel()
#       x86/debug: Simplify #DB signal code
#       x86/debug: Remove handle_debug(.user) argument
#       x86/debug: Move kprobe_debug_handler() into exc_debug_kernel()
#       x86/debug: Sync BTF earlier
# < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-gcc --version
# < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-ld --version
# < git log --format=%s --max-count=1 13cb73490f475f8e7669f9288be0bcfa85399b1f
# < make -s -j 80 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  randconfig
KCONFIG_SEED=0xD1B5888
# Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y
# < make -s -j 80 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  help
# make -s -j 80 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  olddefconfig
.config:6561:warning: override: reassigning to symbol PREVENT_FIRMWARE_BUILD
# make -s -j 80 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  
Completed OK
# rm -rf /kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5.4
# Build took: 0:05:54.754589