# git rev-parse -q --verify da73fcd8cfdc3d0ef49280fa0d511723a0220e03^{commit}
da73fcd8cfdc3d0ef49280fa0d511723a0220e03
already have revision, skipping fetch
# git checkout -q -f -B kisskb da73fcd8cfdc3d0ef49280fa0d511723a0220e03
# git clean -qxdf
# < git log -1
# commit da73fcd8cfdc3d0ef49280fa0d511723a0220e03
# Merge: 3f1266ec704d 8f868d68d335
# 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-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 da73fcd8cfdc3d0ef49280fa0d511723a0220e03
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_40x_walnut_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  40x/walnut_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_40x_walnut_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/kisskb/src/arch/powerpc/kernel/head_40x.S: Assembler messages:
/kisskb/src/arch/powerpc/kernel/head_40x.S:802: Warning: invalid register expression
INFO: Uncompressed kernel (size 0x4fe5b8) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x500000)
Completed OK
# rm -rf /kisskb/build/powerpc-next_40x_walnut_defconfig_powerpc-gcc5
# Build took: 0:00:36.374353