# git rev-parse -q --verify 5695e51619745d4fe3ec2506a2f0cd982c5e27a4^{commit}
5695e51619745d4fe3ec2506a2f0cd982c5e27a4
already have revision, skipping fetch
# git checkout -q -f -B kisskb 5695e51619745d4fe3ec2506a2f0cd982c5e27a4
# git clean -qxdf
# < git log -1
# commit 5695e51619745d4fe3ec2506a2f0cd982c5e27a4
# Merge: 5ceabb6078b8 d6ce7f6761bf
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Sat Feb 27 08:29:02 2021 -0800
# 
#     Merge tag 'io_uring-worker.v3-2021-02-25' of git://git.kernel.dk/linux-block
#     
#     Pull io_uring thread rewrite from Jens Axboe:
#      "This converts the io-wq workers to be forked off the tasks in question
#       instead of being kernel threads that assume various bits of the
#       original task identity.
#     
#       This kills > 400 lines of code from io_uring/io-wq, and it's the worst
#       part of the code. We've had several bugs in this area, and the worry
#       is always that we could be missing some pieces for file types doing
#       unusual things (recent /dev/tty example comes to mind, userfaultfd
#       reads installing file descriptors is another fun one... - both of
#       which need special handling, and I bet it's not the last weird oddity
#       we'll find).
#     
#       With these identical workers, we can have full confidence that we're
#       never missing anything. That, in itself, is a huge win. Outside of
#       that, it's also more efficient since we're not wasting space and code
#       on tracking state, or switching between different states.
#     
#       I'm sure we're going to find little things to patch up after this
#       series, but testing has been pretty thorough, from the usual
#       regression suite to production. Any issue that may crop up should be
#       manageable.
#     
#       There's also a nice series of further reductions we can do on top of
#       this, but I wanted to get the meat of it out sooner rather than later.
#       The general worry here isn't that it's fundamentally broken. Most of
#       the little issues we've found over the last week have been related to
#       just changes in how thread startup/exit is done, since that's the main
#       difference between using kthreads and these kinds of threads. In fact,
#       if all goes according to plan, I want to get this into the 5.10 and
#       5.11 stable branches as well.
#     
#       That said, the changes outside of io_uring/io-wq are:
#     
#        - arch setup, simple one-liner to each arch copy_thread()
#          implementation.
#     
#        - Removal of net and proc restrictions for io_uring, they are no
#          longer needed or useful"
#     
#     * tag 'io_uring-worker.v3-2021-02-25' of git://git.kernel.dk/linux-block: (30 commits)
#       io-wq: remove now unused IO_WQ_BIT_ERROR
#       io_uring: fix SQPOLL thread handling over exec
#       io-wq: improve manager/worker handling over exec
#       io_uring: ensure SQPOLL startup is triggered before error shutdown
#       io-wq: make buffered file write hashed work map per-ctx
#       io-wq: fix race around io_worker grabbing
#       io-wq: fix races around manager/worker creation and task exit
#       io_uring: ensure io-wq context is always destroyed for tasks
#       arch: ensure parisc/powerpc handle PF_IO_WORKER in copy_thread()
#       io_uring: cleanup ->user usage
#       io-wq: remove nr_process accounting
#       io_uring: flag new native workers with IORING_FEAT_NATIVE_WORKERS
#       net: remove cmsg restriction from io_uring based send/recvmsg calls
#       Revert "proc: don't allow async path resolution of /proc/self components"
#       Revert "proc: don't allow async path resolution of /proc/thread-self components"
#       io_uring: move SQPOLL thread io-wq forked worker
#       io-wq: make io_wq_fork_thread() available to other users
#       io-wq: only remove worker from free_list, if it was there
#       io_uring: remove io_identity
#       io_uring: remove any grabbing of context
#       ...
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/hppa-linux/bin/hppa-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/hppa-linux/bin/hppa-linux-ld --version
# < git log --format=%s --max-count=1 5695e51619745d4fe3ec2506a2f0cd982c5e27a4
# < make -s -j 120 ARCH=parisc O=/kisskb/build/linus_parisc-allnoconfig_parisc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/hppa-linux/bin/hppa-linux-  allnoconfig
# < make -s -j 120 ARCH=parisc O=/kisskb/build/linus_parisc-allnoconfig_parisc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/hppa-linux/bin/hppa-linux-  help
# make -s -j 120 ARCH=parisc O=/kisskb/build/linus_parisc-allnoconfig_parisc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/hppa-linux/bin/hppa-linux-  olddefconfig
# make -s -j 120 ARCH=parisc O=/kisskb/build/linus_parisc-allnoconfig_parisc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/hppa-linux/bin/hppa-linux-  
Completed OK
# rm -rf /kisskb/build/linus_parisc-allnoconfig_parisc-gcc8
# Build took: 0:00:12.961242