# git rev-parse -q --verify 7e74e235bb31a1fefc28d5303da0718b88627ea8^{commit}
# git fetch -q -n -f git://fs.ozlabs.ibm.com/kernel/linus master
error: 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 7e74e235bb31a1fefc28d5303da0718b88627ea8^{commit}
7e74e235bb31a1fefc28d5303da0718b88627ea8
# git checkout -q -f -B kisskb 7e74e235bb31a1fefc28d5303da0718b88627ea8
# git clean -qxdf
# < git log -1
# commit 7e74e235bb31a1fefc28d5303da0718b88627ea8
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Wed May 1 12:19:20 2019 -0700
# 
#     gcc-9: don't warn about uninitialized btrfs extent_type variable
#     
#     The 'extent_type' variable does seem to be reliably initialized, but
#     it's _very_ non-obvious, since there's a "goto next" case that jumps
#     over the normal initialization.  That will then always trigger the
#     "start >= extent_end" test, which will end up never falling through to
#     the use of that variable.
#     
#     But the code is certainly not obvious, and the compiler warning looks
#     reasonable.  Make 'extent_type' an int, and initialize it to an invalid
#     negative value, which seems to be the common pattern in other places.
#     
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /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 7e74e235bb31a1fefc28d5303da0718b88627ea8
# < 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
KCONFIG_SEED=0x7AFA4B56
# Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y
# yes \n | 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-  oldconfig
yes: standard output: Broken pipe
# 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-  
arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
arch/arm64/Makefile:40: LSE atomics not supported by binutils
arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
arch/arm64/Makefile:40: LSE atomics not supported by binutils
Completed OK
# rm -rf /kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5.4
# Build took: 0:04:43.104749