# git rev-parse -q --verify da73fcd8cfdc3d0ef49280fa0d511723a0220e03^{commit}
# git fetch -q -n -f git://fs.ozlabs.ibm.com/kernel/linus master
# git rev-parse -q --verify da73fcd8cfdc3d0ef49280fa0d511723a0220e03^{commit}
da73fcd8cfdc3d0ef49280fa0d511723a0220e03
# git checkout -q -f -B kisskb da73fcd8cfdc3d0ef49280fa0d511723a0220e03
# git clean -qxdf
# < git log -1
# commit da73fcd8cfdc3d0ef49280fa0d511723a0220e03
# Merge: 3f1266ec704d3 8f868d68d335a
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Thu Dec 5 16:35:53 2019 -0800
# 
#     Merge branch 'pipe-rework' (patches from David Howells)
#     
#     Merge two fixes for the pipe rework from David Howells:
#      "Here are a couple of patches to fix bugs syzbot found in the pipe
#       changes:
#     
#        - An assertion check will sometimes trip when polling a pipe because
#          the ring size and indices used are approximate and may be being
#          changed simultaneously.
#     
#          An equivalent approximate calculation was done previously, but
#          without the assertion check, so I've just dropped the check. To
#          make it accurate, the pipe mutex would need to be taken or the spin
#          lock could be used - but usage of the spinlock would need to be
#          rolled out into splice, iov_iter and other places for that.
#     
#        - The index mask and the max_usage values cannot be cached across
#          pipe_wait() as F_SETPIPE_SZ could have been called during the wait.
#          This can cause pipe_write() to break"
#     
#     * pipe-rework:
#       pipe: Fix missing mask update after pipe_wait()
#       pipe: Remove assertion from pipe_poll()
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 da73fcd8cfdc3d0ef49280fa0d511723a0220e03
# < make -s -j 10 ARCH=x86_64 O=/kisskb/build/linus-rand_x86_64-randconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  randconfig
KCONFIG_SEED=0x4FE2DD0C

WARNING: unmet direct dependencies detected for THERMAL_GOV_POWER_ALLOCATOR
  Depends on [n]: THERMAL [=y] && ENERGY_MODEL [=n]
  Selected by [y]:
  - THERMAL_DEFAULT_GOV_POWER_ALLOCATOR [=y] && <choice>
# Added to kconfig CONFIG_STANDALONE=y
# Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y
# Added to kconfig CONFIG_CC_STACKPROTECTOR_STRONG=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
# yes \n | make -s -j 10 ARCH=x86_64 O=/kisskb/build/linus-rand_x86_64-randconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  oldconfig
yes: standard output: Broken pipe
# make -s -j 10 ARCH=x86_64 O=/kisskb/build/linus-rand_x86_64-randconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  

WARNING: unmet direct dependencies detected for THERMAL_GOV_POWER_ALLOCATOR
  Depends on [n]: THERMAL [=y] && ENERGY_MODEL [=n]
  Selected by [y]:
  - THERMAL_DEFAULT_GOV_POWER_ALLOCATOR [=y] && <choice>

WARNING: unmet direct dependencies detected for THERMAL_GOV_POWER_ALLOCATOR
  Depends on [n]: THERMAL [=y] && ENERGY_MODEL [=n]
  Selected by [y]:
  - THERMAL_DEFAULT_GOV_POWER_ALLOCATOR [=y] && <choice>

WARNING: unmet direct dependencies detected for THERMAL_GOV_POWER_ALLOCATOR
  Depends on [n]: THERMAL [=y] && ENERGY_MODEL [=n]
  Selected by [y]:
  - THERMAL_DEFAULT_GOV_POWER_ALLOCATOR [=y] && <choice>
/kisskb/src/tools/objtool
Completed OK
# rm -rf /kisskb/build/linus-rand_x86_64-randconfig_x86_64-gcc8
# Build took: 0:07:20.667502