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Joel Fernandes (Google) ea134c3e80 tick/nohz: Fix cpu_is_hotpluggable() by checking with nohz subsystem 
[ Upstream commit 58d7668242 ]

For CONFIG_NO_HZ_FULL systems, the tick_do_timer_cpu cannot be offlined.
However, cpu_is_hotpluggable() still returns true for those CPUs. This causes
torture tests that do offlining to end up trying to offline this CPU causing
test failures. Such failure happens on all architectures.

Fix the repeated error messages thrown by this (even if the hotplug errors are
harmless) by asking the opinion of the nohz subsystem on whether the CPU can be
hotplugged.

[ Apply Frederic Weisbecker feedback on refactoring tick_nohz_cpu_down(). ]

For drivers/base/ portion:
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Frederic Weisbecker <frederic@kernel.org>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Zhouyi Zhou <zhouzhouyi@gmail.com>
Cc: Will Deacon <will@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: rcu <rcu@vger.kernel.org>
Cc: stable@vger.kernel.org
Fixes: 2987557f52 ("driver-core/cpu: Expose hotpluggability to the rest of the kernel")
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-05-17 11:13:22 +02:00
arch parisc: Fix argument pointer in real64_call_asm() 2023-05-17 11:13:20 +02:00
block block: bio-integrity: Copy flags when bio_integrity_payload is cloned 2023-03-11 16:31:33 +01:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-25 11:49:16 +02:00
crypto crypto: drbg - Only fail when jent is unavailable in FIPS mode 2023-05-17 11:13:13 +02:00
Documentation media: uapi: add MEDIA_BUS_FMT_METADATA_FIXED media bus format. 2023-05-17 11:13:09 +02:00
drivers tick/nohz: Fix cpu_is_hotpluggable() by checking with nohz subsystem 2023-05-17 11:13:22 +02:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:21:29 +01:00
fs btrfs: scrub: reject unsupported scrub flags 2023-05-17 11:13:21 +02:00
include tick/nohz: Fix cpu_is_hotpluggable() by checking with nohz subsystem 2023-05-17 11:13:22 +02:00
init random: handle latent entropy and command line from random_init() 2022-06-25 11:49:11 +02:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:18:35 +01:00
kernel tick/nohz: Fix cpu_is_hotpluggable() by checking with nohz subsystem 2023-05-17 11:13:22 +02:00
lib debugobject: Ensure pool refill (again) 2023-05-17 11:13:22 +02:00
LICENSES LICENSES: Remove CC-BY-SA-4.0 license text 2018-10-18 11:28:50 +02:00
mm mm/swap: fix swap_info_struct race between swapoff and get_swap_pages() 2023-04-20 12:04:39 +02:00
net netfilter: nf_tables: deactivate anonymous set from preparation phase 2023-05-17 11:13:22 +02:00
samples samples: vfio-mdev: Fix missing pci_disable_device() in mdpy_fb_probe() 2023-01-18 11:30:28 +01:00
scripts ASN.1: Fix check for strdup() success 2023-04-26 11:21:53 +02:00
security selinux: ensure av_permissions.h is built when needed 2023-05-17 11:13:08 +02:00
sound ASoC: Intel: bytcr_rt5640: Add quirk for the Acer Iconia One 7 B1-750 2023-05-17 11:13:06 +02:00
tools perf auxtrace: Fix address filter entire kernel size 2023-05-17 11:13:21 +02:00
usr initramfs: restore default compression behavior 2020-04-13 10:44:59 +02:00
virt KVM: arm64: vgic: Fix exit condition in scan_its_table() 2022-11-03 23:52:24 +09:00
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MAINTAINERS intel-ethernet: rename i40evf to iavf 2023-04-05 11:15:32 +02:00
Makefile Linux 4.19.282 2023-04-26 11:21:53 +02:00
README

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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.