linux/arch/m68k
Linus Torvalds 5695e51619 io_uring-worker.v3-2021-02-25
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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
  ...
2021-02-27 08:29:02 -08:00
..
68000 Fixes include: 2020-12-21 10:35:11 -08:00
amiga asm-generic: cross-architecture timer cleanup 2020-12-16 00:07:17 -08:00
apollo asm-generic: cross-architecture timer cleanup 2020-12-16 00:07:17 -08:00
atari asm-generic: cross-architecture timer cleanup 2020-12-16 00:07:17 -08:00
bvme6000 asm-generic: cross-architecture timer cleanup 2020-12-16 00:07:17 -08:00
coldfire m68k: let clk_enable() return immediately if clk is NULL 2021-02-08 08:15:17 +10:00
configs m68k: defconfig: Update defconfigs for v5.11-rc1 2021-01-25 13:23:38 +01:00
emu block: store a block_device pointer in struct bio 2021-01-24 18:17:20 -07:00
fpsp040
hp300 asm-generic: cross-architecture timer cleanup 2020-12-16 00:07:17 -08:00
ifpsp060
include m68k: make __pfn_to_phys() and __phys_to_pfn() available for !MMU 2021-02-13 11:42:40 -08:00
kernel io_uring-worker.v3-2021-02-25 2021-02-27 08:29:02 -08:00
lib m68k: get rid of zeroing destination on error in csum_and_copy_from_user() 2020-08-20 15:45:17 -04:00
mac asm-generic: cross-architecture timer cleanup 2020-12-16 00:07:17 -08:00
math-emu treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 74 2019-05-24 17:36:47 +02:00
mm m68k/mm: enable use of generic memory_model.h for !DISCONTIGMEM 2020-12-15 12:13:43 -08:00
mvme16x asm-generic: cross-architecture timer cleanup 2020-12-16 00:07:17 -08:00
mvme147 asm-generic: cross-architecture timer cleanup 2020-12-16 00:07:17 -08:00
q40 asm-generic: cross-architecture timer cleanup 2020-12-16 00:07:17 -08:00
sun3 m68k: remove timer_interrupt() function 2020-10-30 21:57:06 +01:00
sun3x asm-generic: cross-architecture timer cleanup 2020-12-16 00:07:17 -08:00
tools/amiga m68k: tools: Replace zero-length array with flexible-array member 2020-05-25 10:55:56 +02:00
install.sh
Kbuild m68k: sun3: Descend to prom from arch/m68k/sun3 2020-07-13 11:39:12 +02:00
Kconfig Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-10-22 09:59:21 -07:00
Kconfig.bus m68k: Fix Kconfig indentation 2020-03-09 11:12:19 +01:00
Kconfig.cpu Fixes include: 2020-12-21 10:35:11 -08:00
Kconfig.debug m68k: Fix Kconfig indentation 2020-03-09 11:12:19 +01:00
Kconfig.devices treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Kconfig.machine Fixes include: 2020-12-21 10:35:11 -08:00
Makefile kbuild: preprocess module linker script 2020-09-25 00:36:41 +09:00