# git rev-parse -q --verify a087241716a6cea8518ca33839276a9648d91cef^{commit}
a087241716a6cea8518ca33839276a9648d91cef
already have revision, skipping fetch
# git checkout -q -f -B kisskb a087241716a6cea8518ca33839276a9648d91cef
# git clean -qxdf
# < git log -1
# commit a087241716a6cea8518ca33839276a9648d91cef
# Merge: 5ba836eb9fdb dfdc6e73cdcf
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Fri Dec 18 11:08:06 2020 -0800
# 
#     Merge tag 's390-5.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
#     
#     Pull more s390 updates from Heiko Carstens:
#      "This is mainly to decouple udelay() and arch_cpu_idle() and simplify
#       both of them.
#     
#       Summary:
#     
#        - Always initialize kernel stack backchain when entering the kernel,
#          so that unwinding works properly.
#     
#        - Fix stack unwinder test case to avoid rare interrupt stack
#          corruption.
#     
#        - Simplify udelay() and just let it busy loop instead of implementing
#          a complex logic.
#     
#        - arch_cpu_idle() cleanup.
#     
#        - Some other minor improvements"
#     
#     * tag 's390-5.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
#       s390/zcrypt: convert comma to semicolon
#       s390/idle: allow arch_cpu_idle() to be kprobed
#       s390/idle: remove raw_local_irq_save()/restore() from arch_cpu_idle()
#       s390/idle: merge enabled_wait() and arch_cpu_idle()
#       s390/delay: remove udelay_simple()
#       s390/irq: select HAVE_IRQ_EXIT_ON_IRQ_STACK
#       s390/delay: simplify udelay
#       s390/test_unwind: use timer instead of udelay
#       s390/test_unwind: fix CALL_ON_STACK tests
#       s390: make calls to TRACE_IRQS_OFF/TRACE_IRQS_ON balanced
#       s390: always clear kernel stack backchain before calling functions
# < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 a087241716a6cea8518ca33839276a9648d91cef
# < make -s -j 24 ARCH=um O=/kisskb/build/linus_um-allyesconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 allyesconfig
# Added to kconfig CONFIG_STANDALONE=y
# Added to kconfig CONFIG_KCOV=n
# Added to kconfig CONFIG_GCC_PLUGINS=n
# Added to kconfig CONFIG_GCC_PLUGIN_CYC_COMPLEXITY=n
# Added to kconfig CONFIG_GCC_PLUGIN_SANCOV=n
# Added to kconfig CONFIG_GCC_PLUGIN_LATENT_ENTROPY=n
# Added to kconfig CONFIG_GCC_PLUGIN_STRUCTLEAK=n
# Added to kconfig CONFIG_GCC_PLUGIN_RANDSTRUCT=n
# Added to kconfig CONFIG_UML_NET=n
# Added to kconfig CONFIG_UML_NET_ETHERTAP=n
# Added to kconfig CONFIG_UML_NET_TUNTAP=n
# Added to kconfig CONFIG_UML_NET_SLIP=n
# Added to kconfig CONFIG_UML_NET_DAEMON=n
# Added to kconfig CONFIG_UML_NET_VDE=n
# Added to kconfig CONFIG_UML_NET_MCAST=n
# Added to kconfig CONFIG_UML_NET_PCAP=n
# Added to kconfig CONFIG_UML_NET_SLIRP=n
# Added to kconfig CONFIG_GCOV_KERNEL=n
# Added to kconfig CONFIG_DEBUG_INFO_BTF=n
# < make -s -j 24 ARCH=um O=/kisskb/build/linus_um-allyesconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 help
# make -s -j 24 ARCH=um O=/kisskb/build/linus_um-allyesconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 olddefconfig
.config:4437:warning: override: reassigning to symbol GCC_PLUGIN_CYC_COMPLEXITY
.config:4439:warning: override: reassigning to symbol GCC_PLUGIN_LATENT_ENTROPY
.config:4443:warning: override: reassigning to symbol UML_NET_ETHERTAP
.config:4445:warning: override: reassigning to symbol UML_NET_SLIP
.config:4448:warning: override: reassigning to symbol UML_NET_MCAST
.config:4450:warning: override: reassigning to symbol UML_NET_SLIRP
# make -s -j 24 ARCH=um O=/kisskb/build/linus_um-allyesconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 

Auto-detecting system features:
...                        libelf: [ OFF ]
...                          zlib: [ OFF ]
...                           bpf: [ on  ]

No libelf found
make[5]: *** [Makefile:287: elfdep] Error 1
make[4]: *** [/kisskb/src/kernel/bpf/preload/Makefile:8: kernel/bpf/preload/libbpf.a] Error 2
make[3]: *** [/kisskb/src/scripts/Makefile.build:496: kernel/bpf/preload] Error 2
make[2]: *** [/kisskb/src/scripts/Makefile.build:496: kernel/bpf] Error 2
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [/kisskb/src/Makefile:1805: kernel] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:185: __sub-make] Error 2
Command 'make -s -j 24 ARCH=um O=/kisskb/build/linus_um-allyesconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 ' returned non-zero exit status 2
# rm -rf /kisskb/build/linus_um-allyesconfig_um-x86_64
# Build took: 0:06:25.865781