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The source for the Linux kernel used in Windows Subsystem for Linux 2 (WSL2)
720 563 коммитов 10 Ветки 3 162 Теги 3,2 GiB
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Thomas Gleixner 64aee64860 x86/apic: Handle missing global clockevent gracefully 
commit f897e60a12 upstream.

Some newer machines do not advertise legacy timers. The kernel can handle
that situation if the TSC and the CPU frequency are enumerated by CPUID or
MSRs and the CPU supports TSC deadline timer. If the CPU does not support
TSC deadline timer the local APIC timer frequency has to be known as well.

Some Ryzens machines do not advertize legacy timers, but there is no
reliable way to determine the bus frequency which feeds the local APIC
timer when the machine allows overclocking of that frequency.

As there is no legacy timer the local APIC timer calibration crashes due to
a NULL pointer dereference when accessing the not installed global clock
event device.

Switch the calibration loop to a non interrupt based one, which polls
either TSC (if frequency is known) or jiffies. The latter requires a global
clockevent. As the machines which do not have a global clockevent installed
have a known TSC frequency this is a non issue. For older machines where
TSC frequency is not known, there is no known case where the legacy timers
do not exist as that would have been reported long ago.

Reported-by: Daniel Drake <drake@endlessm.com>
Reported-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Daniel Drake <drake@endlessm.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1908091443030.21433@nanos.tec.linutronix.de
Link: http://bugzilla.opensuse.org/show_bug.cgi?id=1142926#c12
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2019-08-29 08:26:43 +02:00
Documentation bpf: add bpf_jit_limit knob to restrict unpriv allocations 2019-08-25 10:50:03 +02:00
arch x86/apic: Handle missing global clockevent gracefully 2019-08-29 08:26:43 +02:00
block block/bio-integrity: fix a memory leak bug 2019-07-31 07:28:55 +02:00
certs Replace magic for trusting the secondary keyring with #define 2018-09-09 19:55:54 +02:00
crypto crypto: chacha20poly1305 - fix atomic sleep when using async algorithm 2019-07-31 07:28:35 +02:00
drivers gpiolib: never report open-drain/source lines as 'input' to user-space 2019-08-29 08:26:42 +02:00
firmware License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fs userfaultfd_release: always remove uffd flags and clear vm_userfaultfd_ctx 2019-08-29 08:26:43 +02:00
include xfrm: policy: remove pcpu policy cache 2019-08-25 10:50:29 +02:00
init init: initialize jump labels before command line option parsing 2019-05-16 19:42:23 +02:00
ipc ipc/mqueue.c: only perform resource calculation if user valid 2019-08-06 19:05:24 +02:00
kernel bpf: fix bpf_jit_limit knob for PAGE_SIZE >= 64K 2019-08-25 10:50:23 +02:00
lib test_firmware: fix a memory leak bug 2019-08-16 10:13:55 +02:00
mm mm/memcontrol.c: fix use after free in mem_cgroup_iter() 2019-08-25 10:50:02 +02:00
net libceph: fix PG split vs OSD (re)connect race 2019-08-29 08:26:42 +02:00
samples samples, bpf: fix to change the buffer size for read() 2019-07-21 09:04:17 +02:00
scripts kbuild: modpost: handle KBUILD_EXTRA_SYMBOLS only for external modules 2019-08-25 10:50:14 +02:00
security selinux: fix memory leak in policydb_init() 2019-08-06 19:05:26 +02:00
sound ASoC: ti: davinci-mcasp: Correct slot_width posed constraint 2019-08-29 08:26:38 +02:00
tools selftests: kvm: Adding config fragments 2019-08-29 08:26:42 +02:00
usr initramfs: fix initramfs rebuilds w/ compression after disabling 2017-11-03 07:39:19 -07:00
virt KVM: arm/arm64: Sync ICH_VMCR_EL2 back when about to block 2019-08-25 10:50:18 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Add hch to .get_maintainer.ignore 2015-08-21 14:30:10 -07:00
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore kbuild: rpm-pkg: keep spec file until make mrproper 2018-02-13 10:19:46 +01:00
.mailmap .mailmap: Add Maciej W. Rozycki's Imagination e-mail address 2017-11-10 12:16:15 -08:00
COPYING
…
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS MAINTAINERS: Add Sasha as a stable branch maintainer 2018-12-01 09:42:50 +01:00
Makefile Linux 4.14.140 2019-08-25 10:50:29 +02:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

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.