# git rev-parse -q --verify 6ebb6814a1ef9573d8488232b50dc53b394c025a^{commit}
# git fetch -q -n -f git://fs.ozlabs.ibm.com/kernel/linus master
warning: The last gc run reported the following. Please correct the root cause
and remove .git/gc.log.
Automatic cleanup will not be performed until the file is removed.

warning: There are too many unreachable loose objects; run 'git prune' to remove them.

# git rev-parse -q --verify 6ebb6814a1ef9573d8488232b50dc53b394c025a^{commit}
6ebb6814a1ef9573d8488232b50dc53b394c025a
# git checkout -q -f -B kisskb 6ebb6814a1ef9573d8488232b50dc53b394c025a
# git clean -qxdf
# < git log -1
# commit 6ebb6814a1ef9573d8488232b50dc53b394c025a
# Merge: 0898678c742e 488e13a489e9
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Sun May 23 06:32:40 2021 -1000
# 
#     Merge tag 'perf-urgent-2021-05-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
#     
#     Pull perf fixes from Thomas Gleixner:
#      "Two perf fixes:
#     
#        - Do not check the LBR_TOS MSR when setting up unrelated LBR MSRs as
#          this can cause malfunction when TOS is not supported
#     
#        - Allocate the LBR XSAVE buffers along with the DS buffers upfront
#          because allocating them when adding an event can deadlock"
#     
#     * tag 'perf-urgent-2021-05-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
#       perf/x86/lbr: Remove cpuc->lbr_xsave allocation from atomic context
#       perf/x86: Avoid touching LBR_TOS MSR for Arch LBR
# < /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 6ebb6814a1ef9573d8488232b50dc53b394c025a
# < make -s -j 48 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
# Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y
# < make -s -j 48 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 48 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:6139:warning: override: reassigning to symbol PREVENT_FIRMWARE_BUILD
# make -s -j 48 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-  
/kisskb/src/arch/arm64/Makefile:25: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
/kisskb/src/arch/arm64/Makefile:25: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
Completed OK
# rm -rf /kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5.4
# Build took: 0:03:14.283381