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mainlining shenanigans

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Jens Axboe e4b4a13f49 io_uring: ensure that threads freeze on suspend Alex reports that his system fails to suspend using 5.12-rc1, with the following dump: [ 240.650300] PM: suspend entry (deep) [ 240.650748] Filesystems sync: 0.000 seconds [ 240.725605] Freezing user space processes ... [ 260.739483] Freezing of tasks failed after 20.013 seconds (3 tasks refusing to freeze, wq_busy=0): [ 260.739497] task:iou-mgr-446 state:S stack: 0 pid: 516 ppid: 439 flags:0x00004224 [ 260.739504] Call Trace: [ 260.739507] ? sysvec_apic_timer_interrupt+0xb/0x81 [ 260.739515] ? pick_next_task_fair+0x197/0x1cde [ 260.739519] ? sysvec_reschedule_ipi+0x2f/0x6a [ 260.739522] ? asm_sysvec_reschedule_ipi+0x12/0x20 [ 260.739525] ? __schedule+0x57/0x6d6 [ 260.739529] ? del_timer_sync+0xb9/0x115 [ 260.739533] ? schedule+0x63/0xd5 [ 260.739536] ? schedule_timeout+0x219/0x356 [ 260.739540] ? __next_timer_interrupt+0xf1/0xf1 [ 260.739544] ? io_wq_manager+0x73/0xb1 [ 260.739549] ? io_wq_create+0x262/0x262 [ 260.739553] ? ret_from_fork+0x22/0x30 [ 260.739557] task:iou-mgr-517 state:S stack: 0 pid: 522 ppid: 439 flags:0x00004224 [ 260.739561] Call Trace: [ 260.739563] ? sysvec_apic_timer_interrupt+0xb/0x81 [ 260.739566] ? pick_next_task_fair+0x16f/0x1cde [ 260.739569] ? sysvec_apic_timer_interrupt+0xb/0x81 [ 260.739571] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 260.739574] ? __schedule+0x5b7/0x6d6 [ 260.739578] ? del_timer_sync+0x70/0x115 [ 260.739581] ? schedule_timeout+0x211/0x356 [ 260.739585] ? __next_timer_interrupt+0xf1/0xf1 [ 260.739588] ? io_wq_check_workers+0x15/0x11f [ 260.739592] ? io_wq_manager+0x69/0xb1 [ 260.739596] ? io_wq_create+0x262/0x262 [ 260.739600] ? ret_from_fork+0x22/0x30 [ 260.739603] task:iou-wrk-517 state:S stack: 0 pid: 523 ppid: 439 flags:0x00004224 [ 260.739607] Call Trace: [ 260.739609] ? __schedule+0x5b7/0x6d6 [ 260.739614] ? schedule+0x63/0xd5 [ 260.739617] ? schedule_timeout+0x219/0x356 [ 260.739621] ? __next_timer_interrupt+0xf1/0xf1 [ 260.739624] ? task_thread.isra.0+0x148/0x3af [ 260.739628] ? task_thread_unbound+0xa/0xa [ 260.739632] ? task_thread_bound+0x7/0x7 [ 260.739636] ? ret_from_fork+0x22/0x30 [ 260.739647] OOM killer enabled. [ 260.739648] Restarting tasks ... done. [ 260.740077] PM: suspend exit Play nice and ensure that any thread we create will call try_to_freeze() at an opportune time so that memory suspend can proceed. For the io-wq worker threads, mark them as PF_NOFREEZE. They could potentially be blocked for a long time. Reported-by: Alex Xu (Hello71) <alex_y_xu@yahoo.ca> Tested-by: Alex Xu (Hello71) <alex_y_xu@yahoo.ca> Signed-off-by: Jens Axboe <axboe@kernel.dk>		2021-03-04 06:38:09 -07:00
arch	Kbuild fixes for v5.12	2021-02-28 12:40:35 -08:00
block	block-5.12-2021-02-27	2021-02-28 11:23:38 -08:00
certs	certs: Replace K{U,G}IDT_INIT() with GLOBAL_ROOT_{U,G}ID	2021-01-21 16:16:10 +00:00
crypto	Keyrings miscellany	2021-02-23 16:09:23 -08:00
Documentation	More new code for 5.12:	2021-02-28 11:45:25 -08:00
drivers	ide-5.11-2021-02-28	2021-02-28 15:48:25 -08:00
fs	io_uring: ensure that threads freeze on suspend	2021-03-04 06:38:09 -07:00
include	io_uring: destroy io-wq on exec	2021-03-04 06:36:22 -07:00
init	kbuild: fix UNUSED_KSYMS_WHITELIST for Clang LTO	2021-02-28 15:19:21 +09:00
ipc	fs: make helpers idmap mount aware	2021-01-24 14:27:20 +01:00
kernel	block-5.12-2021-02-27	2021-02-28 11:23:38 -08:00
lib	ubsan: remove overflow checks	2021-02-26 09:41:05 -08:00
LICENSES	LICENSES: Add the CC-BY-4.0 license	2020-12-08 10:33:27 -07:00
mm	MIPS: make userspace mapping young by default	2021-02-26 09:41:05 -08:00
net	io_uring-worker.v3-2021-02-25	2021-02-27 08:29:02 -08:00
samples	treewide: Miguel has moved	2021-02-26 09:41:03 -08:00
scripts	kbuild: do not include include/config/auto.conf from adjust_autoksyms.sh	2021-02-28 15:22:02 +09:00
security	Keyrings miscellany	2021-02-23 16:09:23 -08:00
sound	ARM updates for 5.12-rc1:	2021-02-22 14:27:07 -08:00
tools	Tracing: Fixes for 5.12	2021-02-26 10:14:18 -08:00
usr	Kbuild updates for v5.12	2021-02-25 10:17:31 -08:00
virt	KVM: x86/mmu: Consider the hva in mmu_notifier retry	2021-02-22 13:16:53 -05:00
.clang-format	cxl for 5.12	2021-02-24 09:38:36 -08:00
.cocciconfig
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	clang-lto series for v5.12-rc1	2021-02-23 09:28:51 -08:00
.mailmap	treewide: Miguel has moved	2021-02-26 09:41:03 -08:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	treewide: Miguel has moved	2021-02-26 09:41:03 -08:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	RISC-V Patches for the 5.12 Merge Window	2021-02-26 10:28:35 -08:00
Makefile	Linux 5.12-rc1	2021-02-28 16:05:19 -08:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.