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Thomas Gleixner a6c42842c6 x86/smp: Enforce CONFIG_HOTPLUG_CPU when SMP=y 
commit bebd024e48 upstream.

The SMT disable 'nosmt' command line argument is not working properly when
CONFIG_HOTPLUG_CPU is disabled. The teardown of the sibling CPUs which are
required to be brought up due to the MCE issues, cannot work. The CPUs are
then kept in a half dead state.

As the 'nosmt' functionality has become popular due to the speculative
hardware vulnerabilities, the half torn down state is not a proper solution
to the problem.

Enforce CONFIG_HOTPLUG_CPU=y when SMP is enabled so the full operation is
possible.

Reported-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Konrad Wilk <konrad.wilk@oracle.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Mukesh Ojha <mojha@codeaurora.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Rik van Riel <riel@surriel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Micheal Kelley <michael.h.kelley@microsoft.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20190326163811.598166056@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-03 06:25:20 +02:00
arch x86/smp: Enforce CONFIG_HOTPLUG_CPU when SMP=y 2019-04-03 06:25:20 +02:00
block blk-mq: fix a hung issue when fsync 2019-02-20 10:20:44 +01:00
certs Replace magic for trusting the secondary keyring with #define 2018-09-09 19:55:54 +02:00
crypto crypto: pcbc - remove bogus memcpy()s with src == dest 2019-03-23 14:35:21 +01:00
Documentation dt-bindings: eeprom: at24: add "atmel,24c2048" compatible string 2019-02-20 10:20:44 +01:00
drivers usb: cdc-acm: fix race during wakeup blocking TX traffic 2019-04-03 06:25:20 +02:00
firmware
fs fs/proc/proc_sysctl.c: fix NULL pointer dereference in put_links 2019-04-03 06:25:19 +02:00
include sctp: get sctphdr by offset in sctp_compute_cksum 2019-04-03 06:25:10 +02:00
init Revert "mm: use early_pfn_to_nid in page_ext_init" 2019-03-23 14:35:13 +01:00
ipc ipc/sem.c: prevent queue.status tearing in semop 2018-09-05 09:26:30 +02:00
kernel cpu/hotplug: Prevent crash when CPU bringup fails on CONFIG_HOTPLUG_CPU=n 2019-04-03 06:25:20 +02:00
lib rhashtable: Still do rehash when we get EEXIST 2019-04-03 06:25:09 +02:00
mm mm/migrate.c: add missing flush_dcache_page for non-mapped page migrate 2019-04-03 06:25:20 +02:00
net tcp: do not use ipv6 header for ipv4 flow 2019-04-03 06:25:09 +02:00
samples samples: mei: use /dev/mei0 instead of /dev/mei 2019-02-15 08:09:12 +01:00
scripts kbuild: modversions: Fix relative CRC byte order interpretation 2019-04-03 06:25:17 +02:00
security security/selinux: fix SECURITY_LSM_NATIVE_LABELS on reused superblock 2019-03-23 14:35:26 +01:00
sound ALSA: hda/realtek - Add support headset mode for New DELL WYSE NB 2019-04-03 06:25:16 +02:00
tools perf intel-pt: Fix TSC slip 2019-04-03 06:25:20 +02:00
usr
virt KVM: Call kvm_arch_memslots_updated() before updating memslots 2019-03-23 14:35:31 +01:00
.cocciconfig
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.gitignore kbuild: rpm-pkg: keep spec file until make mrproper 2018-02-13 10:19:46 +01:00
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MAINTAINERS MAINTAINERS: Add Sasha as a stable branch maintainer 2018-12-01 09:42:50 +01:00
Makefile Linux 4.14.109 2019-03-27 14:13:56 +09:00
README

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.