From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 30 Aug 2013 00:02:48 +0000 (-0700)
Subject: Merge branch 'for-3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
X-Git-Tag: firefly_0821_release~176^2~5494
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ff497452636f4687e517964817b7e2bd99f4b44b;p=firefly-linux-kernel-4.4.55.git

Merge branch 'for-3.11-fixes' of git://git./linux/kernel/git/tj/wq

Pull workqueue fix from Tejun Heo:
 "This contains one fix which could lead to system-wide lockup on
  !PREEMPT kernels.  It's very late in the cycle but this definitely is
  a -stable material.

  The problem is that workqueue worker tasks may process unlimited
  number of work items back-to-back without every yielding inbetween.
  This usually isn't noticeable but a work item which re-queues itself
  waiting for someone else to do something can deadlock with
  stop_machine.  stop_machine will ensure nothing else happens on all
  other cpus and the requeueing work item will reqeueue itself
  indefinitely without ever yielding and thus preventing the CPU from
  entering stop_machine.

  Kudos to Jamie Liu for spotting and diagnosing the problem.  This can
  be trivially fixed by adding cond_resched() after processing each work
  item"

* 'for-3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  workqueue: cond_resched() after processing each work item
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ff497452636f4687e517964817b7e2bd99f4b44b