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Wen Yang 807e0d187d tick/sched: Fix bogus condition in report_idle_softirq() In commit `0345691b24` ("tick/rcu: Stop allowing RCU_SOFTIRQ in idle") the new function report_idle_softirq() was created by breaking code out of the existing can_stop_idle_tick() for kernels v5.18 and newer. In doing so, the code essentially went from this form: if (A) { static int ratelimit; if (ratelimit < 10 && !C && A&D) { pr_warn("NOHZ tick-stop error: ..."); ratelimit++; } return false; } to a new function: static bool report_idle_softirq(void) { static int ratelimit; if (likely(!A)) return false; if (ratelimit < 10) return false; ... pr_warn("NOHZ tick-stop error: local softirq work is pending, handler #%02x!!!\n", pending); ratelimit++; return true; } commit `a7e282c777` ("tick/rcu: Fix bogus ratelimit condition") realized ratelimit was essentially set to zero instead of ten, and hence no softirq pending messages would ever be issued, but "fixed" it as: - if (ratelimit < 10) + if (ratelimit >= 10) return false; However, this fix introduced another issue: When ratelimit is greater than or equal 10, even if A is true, it will directly return false. While ratelimit in the original code was only used to control printing and will not affect the return value. Restore the original logic and restrict ratelimit to control the printk and not the return value. Fixes: `0345691b24` ("tick/rcu: Stop allowing RCU_SOFTIRQ in idle") Fixes: `a7e282c777` ("tick/rcu: Fix bogus ratelimit condition") Signed-off-by: Wen Yang <wen.yang@linux.dev> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://patch.msgid.link/20251119174525.29470-1-wen.yang@linux.dev		2025-11-19 19:30:45 +01:00
arch	7 hotfixes. 5 are cc:stable, 4 are against mm/.	2025-11-16 13:31:14 -08:00
block	block-6.18-20251031	2025-10-31 12:57:19 -07:00
certs	sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3	2024-09-20 19:52:48 +03:00
crypto	This push contains the following changes:	2025-10-10 08:56:16 -07:00
Documentation	sound fixes for 6.18-rc6	2025-11-14 12:50:08 -08:00
drivers	firewire fixes for 6.18-rc6	2025-11-16 07:08:28 -08:00
fs	More NFS Client Bugfixes for Linux 6.18-rc	2025-11-14 13:44:23 -08:00
include	7 hotfixes. 5 are cc:stable, 4 are against mm/.	2025-11-16 13:31:14 -08:00
init	printk changes for 6.18	2025-10-04 11:13:11 -07:00
io_uring	io_uring/rsrc: don't use blk_rq_nr_phys_segments() as number of bvecs	2025-11-12 08:25:33 -07:00
ipc	namespace-6.18-rc1	2025-09-29 11:20:29 -07:00
kernel	tick/sched: Fix bogus condition in report_idle_softirq()	2025-11-19 19:30:45 +01:00
lib	lib/test_kho: check if KHO is enabled	2025-11-15 10:52:01 -08:00
LICENSES	LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2	2025-07-24 11:15:39 +02:00
mm	7 hotfixes. 5 are cc:stable, 4 are against mm/.	2025-11-16 13:31:14 -08:00
net	bpf-fixes	2025-11-14 15:39:39 -08:00
rust	rust: Add -fno-isolate-erroneous-paths-dereference to bindgen_skip_c_flags	2025-11-10 08:37:06 +08:00
samples	Char/Misc/IIO/Binder changes for 6.18-rc1	2025-10-04 16:26:32 -07:00
scripts	Rust fixes for v6.18 (2nd)	2025-11-14 15:36:15 -08:00
security	integrity-v6.18	2025-10-05 10:48:33 -07:00
sound	ALSA: usb-audio: Add native DSD quirks for PureAudio DAC series	2025-11-14 14:19:47 +01:00
tools	perf tools fixes for v6.18: 2nd batch	2025-11-16 13:45:03 -08:00
usr	gen_init_cpio: Ignore fsync() returning EINVAL on pipes	2025-10-07 09:53:05 -07:00
virt	KVM: guest_memfd: Remove bindings on memslot deletion when gmem is dying	2025-11-04 09:16:53 -08:00
.clang-format	memblock: drop for_each_free_mem_pfn_range_in_zone_from()	2025-09-14 08:49:03 +03:00
.clippy.toml	rust: clean Rust 1.88.0's warning about `clippy::disallowed_macros` configuration	2025-05-07 00:11:47 +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: remove Alyssa Rosenzweig	2025-09-18 21:17:31 +02:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	.gitignore: ignore compile_commands.json globally	2025-08-12 15:53:55 -07:00
.mailmap	7 hotfixes. 5 are cc:stable, 4 are against mm/.	2025-11-16 13:31:14 -08:00
.pylintrc	tools: docs: parse-headers.py: move it from sphinx dir	2025-08-29 15:54:42 -06:00
.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	MAINTAINERS: mark ISDN subsystem as orphan	2025-10-27 17:49:45 -07:00
Kbuild	sched: Make migrate_{en,dis}able() inline	2025-09-25 09:57:16 +02:00
Kconfig	io_uring: Rename KConfig to Kconfig	2025-02-19 14:53:27 -07:00
MAINTAINERS	7 hotfixes. 5 are cc:stable, 4 are against mm/.	2025-11-16 13:31:14 -08:00
Makefile	Linux 6.18-rc6	2025-11-16 14:25:38 -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.