From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 11 Oct 2024 21:42:27 +0000 (-0700)
Subject: Merge tag 'rcu.fixes.6.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu... 
X-Git-Tag: v6.12-rc3~12
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a1029768f3931b31aa52790f1dde0c7d6a6552eb;p=thirdparty%2Fkernel%2Flinux.git

Merge tag 'rcu.fixes.6.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux

Pull RCU fix from Neeraj Upadhyay:
 "Fix rcuog kthread wakeup invocation from softirq context on a CPU
  which has been marked offline.

  This can happen when new callbacks are enqueued from a softirq on an
  offline CPU before it calls rcutree_report_cpu_dead(). When this
  happens on NOCB configuration, the rcuog wake-up is deferred through
  an IPI to an online CPU. This is done to avoid call into the scheduler
  which can risk arming the RT-bandwidth after hrtimers have been
  migrated out and disabled.

  However, doing IPI call from softirq is not allowed: Fix this by
  forcing deferred rcuog wakeup through the NOCB timer when the CPU is
  offline"

* tag 'rcu.fixes.6.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux:
  rcu/nocb: Fix rcuog wake-up from offline softirq
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a1029768f3931b31aa52790f1dde0c7d6a6552eb