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Peter Zijlstra 85d68222dd rcu: Break rcu_node_0 --> &rq->__lock order 
Commit 851a723e45 ("sched: Always clear user_cpus_ptr in
do_set_cpus_allowed()") added a kfree() call to free any user
provided affinity mask, if present. It was changed later to use
kfree_rcu() in commit 9a5418bc48 ("sched/core: Use kfree_rcu()
in do_set_cpus_allowed()") to avoid a circular locking dependency
problem.

It turns out that even kfree_rcu() isn't safe for avoiding
circular locking problem. As reported by kernel test robot,
the following circular locking dependency now exists:

  &rdp->nocb_lock --> rcu_node_0 --> &rq->__lock

Solve this by breaking the rcu_node_0 --> &rq->__lock chain by moving
the resched_cpu() out from under rcu_node lock.

[peterz: heavily borrowed from Waiman's Changelog]
[paulmck: applied Z qiang feedback]

Fixes: 851a723e45 ("sched: Always clear user_cpus_ptr in do_set_cpus_allowed()")
Reported-by: kernel test robot <oliver.sang@intel.com>
Acked-by: Waiman Long <longman@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/oe-lkp/202310302207.a25f1a30-oliver.sang@intel.com
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
2023-11-01 21:39:58 +01:00
arch RCU pull request for v6.7 2023-10-30 18:01:41 -10:00
block vfs-6.7.super 2023-10-30 08:59:05 -10:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto KEYS: asymmetric: Fix sign/verify on pkcs1pad without a hash 2023-10-18 12:27:10 +08:00
Documentation RCU pull request for v6.7 2023-10-30 18:01:41 -10:00
drivers X86 core code updates: 2023-10-30 17:37:47 -10:00
fs Initial bcachefs pull request for 6.7-rc1 2023-10-30 11:09:38 -10:00
include RCU pull request for v6.7 2023-10-30 18:01:41 -10:00
init - A bunch of improvements, cleanups and fixlets to the SRSO mitigation 2023-10-30 11:48:49 -10:00
io_uring vfs-6.7.misc 2023-10-30 09:14:19 -10:00
ipc ipc: convert to new timestamp accessors 2023-10-18 14:08:30 +02:00
kernel rcu: Break rcu_node_0 --> &rq->__lock order 2023-11-01 21:39:58 +01:00
lib Scheduler changes for v6.7 are: 2023-10-30 13:12:15 -10:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm RCU pull request for v6.7 2023-10-30 18:01:41 -10:00
net NFSD 6.7 Release Notes 2023-10-30 10:12:29 -10:00
rust rust: docs: fix logo replacement 2023-10-19 16:40:00 +02:00
samples VFIO updates for v6.6-rc1 2023-08-30 20:36:01 -07:00
scripts RCU pull request for v6.7 2023-10-30 18:01:41 -10:00
security vfs-6.7.ctime 2023-10-30 09:47:13 -10:00
sound vfs-6.7.iov_iter 2023-10-30 09:24:21 -10:00
tools RCU pull request for v6.7 2023-10-30 18:01:41 -10:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt ARM: 2023-09-07 13:52:20 -07:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: rpm-pkg: rename binkernel.spec to kernel.spec 2023-07-25 00:59:33 +09:00
.mailmap 20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues 2023-10-24 09:52:16 -10:00
.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 USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
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 - A new EDAC driver for Xilinx's Versal integrated memory controller 2023-10-30 11:45:36 -10:00
Makefile Linux 6.6 2023-10-29 16:31:08 -10:00
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.