linux-stable.git/arch/x86/kernel/cpuid.c, branch linux-rolling-stable

x86/cpuid: make cpuid_class a static const structure

2023-08-05T06:31:41+00:00

Now that the driver core allows for struct class to be in read-only
memory, move the cpuid_class structure to be declared at build time
placing it into read-only memory, instead of having to be dynamically
allocated at boot time.

Cc: "H. Peter Anvin" 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: Borislav Petkov 
Cc: Dave Hansen 
Cc: x86@kernel.org
Suggested-by: Greg Kroah-Hartman 
Signed-off-by: Ivan Orlov 
Link: https://lore.kernel.org/r/20230620144431.583290-4-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman

driver core: class: remove module * from class_create()

2023-03-17T14:16:33+00:00

The module pointer in class_create() never actually did anything, and it
shouldn't have been requred to be set as a parameter even if it did
something.  So just remove it and fix up all callers of the function in
the kernel tree at the same time.

Cc: "Rafael J. Wysocki" 
Acked-by: Benjamin Tissoires 
Link: https://lore.kernel.org/r/20230313181843.1207845-4-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman

driver core: make struct class.devnode() take a const *

2022-11-24T16:12:27+00:00

The devnode() in struct class should not be modifying the device that is
passed into it, so mark it as a const * and propagate the function
signature changes out into all relevant subsystems that use this
callback.

Cc: Fenghua Yu 
Cc: Reinette Chatre 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: Borislav Petkov 
Cc: Dave Hansen 
Cc: x86@kernel.org
Cc: "H. Peter Anvin" 
Cc: FUJITA Tomonori 
Cc: Jens Axboe 
Cc: Justin Sanders 
Cc: Arnd Bergmann 
Cc: Sumit Semwal 
Cc: Benjamin Gaignard 
Cc: Liam Mark 
Cc: Laura Abbott 
Cc: Brian Starkey 
Cc: John Stultz 
Cc: "Christian König" 
Cc: Maarten Lankhorst 
Cc: Maxime Ripard 
Cc: Thomas Zimmermann 
Cc: David Airlie 
Cc: Daniel Vetter 
Cc: Jason Gunthorpe 
Cc: Leon Romanovsky 
Cc: Dennis Dalessandro 
Cc: Dmitry Torokhov 
Cc: Mauro Carvalho Chehab 
Cc: Sean Young 
Cc: Frank Haverkamp 
Cc: Jiri Slaby 
Cc: "Michael S. Tsirkin" 
Cc: Jason Wang 
Cc: Alex Williamson 
Cc: Cornelia Huck 
Cc: Kees Cook 
Cc: Anton Vorontsov 
Cc: Colin Cross 
Cc: Tony Luck 
Cc: Jaroslav Kysela 
Cc: Takashi Iwai 
Cc: Hans Verkuil 
Cc: Christophe JAILLET 
Cc: Xie Yongji 
Cc: Gautam Dawar 
Cc: Dan Carpenter 
Cc: Eli Cohen 
Cc: Parav Pandit 
Cc: Maxime Coquelin 
Cc: alsa-devel@alsa-project.org
Cc: dri-devel@lists.freedesktop.org
Cc: kvm@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Cc: linux-block@vger.kernel.org
Cc: linux-input@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-media@vger.kernel.org
Cc: linux-rdma@vger.kernel.org
Cc: linux-scsi@vger.kernel.org
Cc: linux-usb@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org
Link: https://lore.kernel.org/r/20221123122523.1332370-2-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman

smp: Cleanup smp_call_function*()

2020-11-24T15:47:49+00:00

Get rid of the __call_single_node union and cleanup the API a little
to avoid external code relying on the structure layout as much.

Signed-off-by: Peter Zijlstra (Intel) 
Reviewed-by: Frederic Weisbecker

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 142

2019-05-30T18:25:17+00:00

Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation inc 675 mass ave cambridge ma 02139 usa
  either version 2 of the license or at your option any later version
  incorporated herein by reference

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 4 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Richard Fontana 
Reviewed-by: Allison Randal 
Reviewed-by: Kate Stewart 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190524100844.465381181@linutronix.de
Signed-off-by: Greg Kroah-Hartman

x86/cpuid: Allow cpuid_read() to schedule

2018-03-27T10:01:48+00:00

High latencies can be observed caused by a daemon periodically reading
CPUID on all cpus. On KASAN enabled kernels ~10ms latencies can be
observed. Even without KASAN, sending an IPI to a CPU, which is in a deep
sleep state or in a long hard IRQ disabled section, waiting for the answer
can consume hundreds of microseconds.

cpuid_read() is invoked in preemptible context, so it can be converted to
sleep instead of busy wait.

Switching to smp_call_function_single_async() and a completion allows to
reschedule and reduces CPU usage and latencies.

Signed-off-by: Eric Dumazet 
Signed-off-by: Thomas Gleixner 
Acked-by: Ingo Molnar 
Cc: Hugh Dickins 
Cc: Borislav Petkov 
Cc: Eric Dumazet 
Link: https://lkml.kernel.org/r/20180323215818.127774-2-edumazet@google.com

Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2016-12-13T03:25:04+00:00

Pull smp hotplug updates from Thomas Gleixner:
 "This is the final round of converting the notifier mess to the state
  machine. The removal of the notifiers and the related infrastructure
  will happen around rc1, as there are conversions outstanding in other
  trees.

  The whole exercise removed about 2000 lines of code in total and in
  course of the conversion several dozen bugs got fixed. The new
  mechanism allows to test almost every hotplug step standalone, so
  usage sites can exercise all transitions extensively.

  There is more room for improvement, like integrating all the
  pointlessly different architecture mechanisms of synchronizing,
  setting cpus online etc into the core code"

* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (60 commits)
  tracing/rb: Init the CPU mask on allocation
  soc/fsl/qbman: Convert to hotplug state machine
  soc/fsl/qbman: Convert to hotplug state machine
  zram: Convert to hotplug state machine
  KVM/PPC/Book3S HV: Convert to hotplug state machine
  arm64/cpuinfo: Convert to hotplug state machine
  arm64/cpuinfo: Make hotplug notifier symmetric
  mm/compaction: Convert to hotplug state machine
  iommu/vt-d: Convert to hotplug state machine
  mm/zswap: Convert pool to hotplug state machine
  mm/zswap: Convert dst-mem to hotplug state machine
  mm/zsmalloc: Convert to hotplug state machine
  mm/vmstat: Convert to hotplug state machine
  mm/vmstat: Avoid on each online CPU loops
  mm/vmstat: Drop get_online_cpus() from init_cpu_node_state/vmstat_cpu_dead()
  tracing/rb: Convert to hotplug state machine
  oprofile/nmi timer: Convert to hotplug state machine
  net/iucv: Use explicit clean up labels in iucv_init()
  x86/pci/amd-bus: Convert to hotplug state machine
  x86/oprofile/nmi: Convert to hotplug state machine
  ...

x86/cpuid: Move the hotplug callbacks to online

2016-11-22T22:34:39+00:00

No point to have this file around before the cpu is online and no point to
have it around until the cpu is dead. Get rid of the explicit state.

Signed-off-by: Thomas Gleixner 
Cc: Sebastian Siewior

x86/cpuid: Convert to hotplug state machine

2016-11-22T22:34:39+00:00

Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs.

Signed-off-by: Sebastian Andrzej Siewior 
Cc: rt@linuxtronix.de
Link: http://lkml.kernel.org/r/20161117183541.8588-3-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner

x86/cpuid: Cleanup cpuid_regs definitions

2016-11-16T10:13:09+00:00

cpuid_regs is defined multiple times as structure and enum. Rename the enum
and move all of it to processor.h so we don't end up with more instances.

Rename the misnomed register enumeration from CR_* to the obvious CPUID_*.

[ tglx: Rewrote changelog ]

Signed-off-by: He Chen 
Reviewed-by: Borislav Petkov 
Cc: Luwei Kang 
Cc: kvm@vger.kernel.org
Cc: Radim Krčmář 
Cc: Piotr Luc 
Cc: Paolo Bonzini 
Link: http://lkml.kernel.org/r/1478856336-9388-2-git-send-email-he.chen@linux.intel.com
Signed-off-by: Thomas Gleixner