From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sat, 23 Mar 2024 21:49:25 +0000 (-0700)
Subject: Merge tag 'timers-urgent-2024-03-23' of git://git.kernel.org/pub/scm/linux/kernel... 
X-Git-Tag: v6.9-rc1~5
X-Git-Url: http://git.samba.org/?p=sfrench%2Fcifs-2.6.git;a=commitdiff_plain;h=70293240c5ce675a67bfc48f419b093023b862b3

Merge tag 'timers-urgent-2024-03-23' of git://git./linux/kernel/git/tip/tip

Pull timer fixes from Thomas Gleixner:
 "Two regression fixes for the timer and timer migration code:

   - Prevent endless timer requeuing which is caused by two CPUs racing
     out of idle. This happens when the last CPU goes idle and therefore
     has to ensure to expire the pending global timers and some other
     CPU come out of idle at the same time and the other CPU wins the
     race and expires the global queue. This causes the last CPU to
     chase ghost timers forever and reprogramming it's clockevent device
     endlessly.

     Cure this by re-evaluating the wakeup time unconditionally.

   - The split into local (pinned) and global timers in the timer wheel
     caused a regression for NOHZ full as it broke the idle tracking of
     global timers. On NOHZ full this prevents an self IPI being sent
     which in turn causes the timer to be not programmed and not being
     expired on time.

     Restore the idle tracking for the global timer base so that the
     self IPI condition for NOHZ full is working correctly again"

* tag 'timers-urgent-2024-03-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  timers: Fix removed self-IPI on global timer's enqueue in nohz_full
  timers/migration: Fix endless timer requeue after idle interrupts
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70293240c5ce675a67bfc48f419b093023b862b3