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Peter Zijlstra a148866489 sched: Replace rq::wake_list 
The recent commit: 90b5363acd ("sched: Clean up scheduler_ipi()")
got smp_call_function_single_async() subtly wrong. Even though it will
return -EBUSY when trying to re-use a csd, that condition is not
atomic and still requires external serialization.

The change in ttwu_queue_remote() got this wrong.

While on first reading ttwu_queue_remote() has an atomic test-and-set
that appears to serialize the use, the matching 'release' is not in
the right place to actually guarantee this serialization.

The actual race is vs the sched_ttwu_pending() call in the idle loop;
that can run the wakeup-list without consuming the CSD.

Instead of trying to chain the lists, merge them.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200526161908.129371594@infradead.org
2020-05-28 10:54:16 +02:00
arch Merge branch 'core/rcu' into sched/core, to pick up dependency 2020-05-28 10:52:53 +02:00
block
certs
crypto
Documentation Merge branch 'core/rcu' into sched/core, to pick up dependency 2020-05-28 10:52:53 +02:00
drivers Merge branch 'core/rcu' into sched/core, to pick up dependency 2020-05-28 10:52:53 +02:00
fs Merge branch 'exec-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2020-05-17 12:23:37 -07:00
include sched: Replace rq::wake_list 2020-05-28 10:54:16 +02:00
init Merge branch 'core/rcu' into sched/core, to pick up dependency 2020-05-28 10:52:53 +02:00
ipc
kernel sched: Replace rq::wake_list 2020-05-28 10:54:16 +02:00
lib Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-15 13:10:06 -07:00
LICENSES
mm
net NFS client bugfixes for Linux 5.7 2020-05-15 14:03:13 -07:00
samples Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-15 13:10:06 -07:00
scripts vmlinux.lds.h: Create section for protection against instrumentation 2020-05-19 15:47:20 +02:00
security
sound sound fixes for 5.7-rc6 2020-05-15 10:06:49 -07:00
tools Merge branch 'core/rcu' into sched/core, to pick up dependency 2020-05-28 10:52:53 +02:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-15 13:10:06 -07:00
Makefile Linux 5.7-rc6 2020-05-17 16:48:37 -07:00
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.

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.