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Tvrtko Ursulin de35994ecd workqueue: Do not warn when cancelling WQ_MEM_RECLAIM work from !WQ_MEM_RECLAIM worker After commit `746ae46c11` ("drm/sched: Mark scheduler work queues with WQ_MEM_RECLAIM") amdgpu started seeing the following warning: [ ] workqueue: WQ_MEM_RECLAIM sdma0:drm_sched_run_job_work [gpu_sched] is flushing !WQ_MEM_RECLAIM events:amdgpu_device_delay_enable_gfx_off [amdgpu] ... [ ] Workqueue: sdma0 drm_sched_run_job_work [gpu_sched] ... [ ] Call Trace: [ ] <TASK> ... [ ] ? check_flush_dependency+0xf5/0x110 ... [ ] cancel_delayed_work_sync+0x6e/0x80 [ ] amdgpu_gfx_off_ctrl+0xab/0x140 [amdgpu] [ ] amdgpu_ring_alloc+0x40/0x50 [amdgpu] [ ] amdgpu_ib_schedule+0xf4/0x810 [amdgpu] [ ] ? drm_sched_run_job_work+0x22c/0x430 [gpu_sched] [ ] amdgpu_job_run+0xaa/0x1f0 [amdgpu] [ ] drm_sched_run_job_work+0x257/0x430 [gpu_sched] [ ] process_one_work+0x217/0x720 ... [ ] </TASK> The intent of the verifcation done in check_flush_depedency is to ensure forward progress during memory reclaim, by flagging cases when either a memory reclaim process, or a memory reclaim work item is flushed from a context not marked as memory reclaim safe. This is correct when flushing, but when called from the cancel(_delayed)_work_sync() paths it is a false positive because work is either already running, or will not be running at all. Therefore cancelling it is safe and we can relax the warning criteria by letting the helper know of the calling context. Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com> Fixes: `fca839c00a` ("workqueue: warn if memory reclaim tries to flush !WQ_MEM_RECLAIM workqueue") References: `746ae46c11` ("drm/sched: Mark scheduler work queues with WQ_MEM_RECLAIM") Cc: Tejun Heo <tj@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Cc: Alex Deucher <alexander.deucher@amd.com> Cc: Christian König <christian.koenig@amd.com Cc: Matthew Brost <matthew.brost@intel.com> Cc: <stable@vger.kernel.org> # v4.5+ Signed-off-by: Tejun Heo <tj@kernel.org>		History 2024-12-19 06:15:35 -10:00
arch	i2c-for-6.13-rc1-part3	2024-12-01 13:38:24 -08:00
block	block-6.13-20242901	2024-11-30 15:47:29 -08:00
certs	sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3	2024-09-20 19:52:48 +03:00
crypto	Random number generator updates for Linux 6.13-rc1.	2024-11-19 10:43:44 -08:00
Documentation	- Move the ->select callback to the correct ops structure in irq-mvebu-sei to	2024-12-01 12:37:58 -08:00
drivers	i2c-for-6.13-rc1-part3	2024-12-01 13:38:24 -08:00
fs	This pull request contains the following changes for UML:	2024-11-30 10:34:54 -08:00
include	i2c-for-6.13-rc1-part3	2024-12-01 13:38:24 -08:00
init	- The series "resource: A couple of cleanups" from Andy Shevchenko	2024-11-25 16:09:48 -08:00
io_uring	io_uring-6.13-20242901	2024-11-30 15:43:02 -08:00
ipc	- The series "resource: A couple of cleanups" from Andy Shevchenko	2024-11-25 16:09:48 -08:00
kernel	workqueue: Do not warn when cancelling WQ_MEM_RECLAIM work from !WQ_MEM_RECLAIM worker	2024-12-19 06:15:35 -10:00
lib	vsnprintf: Removal of bprintf()	2024-12-01 13:10:51 -08:00
LICENSES	LICENSES: add 0BSD license text	2024-09-01 20:43:24 -07:00
mm	Kbuild updates for v6.13	2024-11-30 13:41:50 -08:00
net	9p update for 6.13-rc1	2024-11-30 10:28:14 -08:00
rust	rust: add safety comment in workqueue traits	2024-12-03 10:47:58 -10:00
samples	TTY / Serial driver updates for 6.13-rc1	2024-11-30 09:03:16 -08:00
scripts	Kbuild updates for v6.13	2024-11-30 13:41:50 -08:00
security	lsm/stable-6.13 PR 20241129	2024-11-30 18:14:56 -08:00
sound	sound fixes for 6.13-rc1	2024-11-29 13:01:05 -08:00
tools	turbostat version 2024.11.30	2024-11-30 18:30:22 -08:00
usr	initramfs: shorten cmd_initfs in usr/Makefile	2024-07-16 01:07:52 +09:00
virt	VFIO updates for v6.13	2024-11-27 12:57:03 -08:00
.clang-format	clang-format: Update with v6.11-rc1's `for_each` macro list	2024-08-02 13:20:31 +02:00
.clippy.toml	rust: enable Clippy's `check-private-items`	2024-10-07 21:39:57 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.editorconfig	.editorconfig: remove trim_trailing_whitespace option	2024-06-13 16:47:52 +02:00
.get_maintainer.ignore	MAINTAINERS: Retire Ralf Baechle	2024-11-12 15:48:59 +01:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	Kbuild updates for v6.13	2024-11-30 13:41:50 -08:00
.mailmap	media updates for v6.13-rc1	2024-11-20 14:01:15 -08:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	cgroup: Changes for v6.13	2024-11-20 09:54:49 -08:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	i2c-for-6.13-rc1-part3	2024-12-01 13:38:24 -08:00
Makefile	Linux 6.13-rc1	2024-12-01 14:28:56 -08:00
README	README: Fix spelling	2024-03-18 03:36:32 -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 reStructuredText 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.