From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sun, 9 May 2021 20:14:34 +0000 (-0700)
Subject: Merge tag 'sched-urgent-2021-05-09' of git://git.kernel.org/pub/scm/linux/kernel... 
X-Git-Tag: v5.13-rc1~5
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=9819f682e48c6a7055c5d7a6746411dd3969b0e5;p=linux-block.git

Merge tag 'sched-urgent-2021-05-09' of git://git./linux/kernel/git/tip/tip

Pull scheduler fixes from Thomas Gleixner:
 "A set of scheduler updates:

   - Prevent PSI state corruption when schedule() races with cgroup
     move.

     A recent commit combined two PSI callbacks to reduce the number of
     cgroup tree updates, but missed that schedule() can drop rq::lock
     for load balancing, which opens the race window for
     cgroup_move_task() which then observes half updated state.

     The fix is to solely use task::ps_flags instead of looking at the
     potentially mismatching scheduler state

   - Prevent an out-of-bounds access in uclamp caused bu a rounding
     division which can lead to an off-by-one error exceeding the
     buckets array size.

   - Prevent unfairness caused by missing load decay when a task is
     attached to a cfs runqueue.

     The old load of the task was attached to the runqueue and never
     removed. Fix it by enforcing the load update through the hierarchy
     for unthrottled run queue instances.

   - A documentation fix fot the 'sched_verbose' command line option"

* tag 'sched-urgent-2021-05-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/fair: Fix unfairness caused by missing load decay
  sched: Fix out-of-bound access in uclamp
  psi: Fix psi state corruption when schedule() races with cgroup move
  sched,doc: sched_debug_verbose cmdline should be sched_verbose
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9819f682e48c6a7055c5d7a6746411dd3969b0e5