From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue, 17 Sep 2019 17:32:05 +0000 (-0700)
Subject: Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel... 
X-Git-Tag: v5.4-rc1~164
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3cd0462230d806077c709e44af8733795eaa712c;p=platform%2Fkernel%2Flinux-rpi.git

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

Pull CPU hotplug updates from Thomas Gleixner:
 "A small update for the SMP hotplug code code:

   - Track "booted once" CPUs in a cpumask so the x86 APIC code has an
     easy way to decide whether broadcast IPIs are safe to use or not.

   - Implement a cpumask_or_equal() helper for the IPI broadcast
     evaluation.

     The above two changes have been also pulled into the x86/apic
     branch for implementing the conditional IPI broadcast feature.

   - Cache the number of online CPUs instead of reevaluating it over and
     over. num_online_cpus() is an unreliable snapshot anyway except
     when it is used outside a cpu hotplug locked region. The cached
     access is not changing this, but it's definitely faster than
     calculating the bitmap wheight especially in hot paths"

* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  cpu/hotplug: Cache number of online CPUs
  cpumask: Implement cpumask_or_equal()
  smp/hotplug: Track booted once CPUs in a cpumask
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3cd0462230d806077c709e44af8733795eaa712c