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From: Andriy Gapon <avg@FreeBSD.org>
Date: Sat, 30 Jul 2011 20:29:39 +0000 (UTC)
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Subject: cvs commit: src/sys/kern subr_smp.c
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avg         2011-07-30 20:29:39 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             subr_smp.c 
  Log:
  SVN rev 224527 on 2011-07-30 20:29:39Z by avg
  
  smp_rendezvous: master cpu should wait until all slaves are fully done
  
  This is a followup to r222032 and a reimplementation of it.
  While that revision fixed the race for the smp_rv_waiters[2] exit
  sentinel, it still left a possibility for a target CPU to access
  stale or wrong smp_rv_func_arg in smp_rv_teardown_func.
  To fix this race the slave CPUs signal when they are really fully
  done with the rendezvous and the master CPU waits until all slaves
  are done.
  
  Diagnosed by:   kib
  Reviewed by:    jhb, mlaier, neel
  Approved by:    re (kib)
  MFC after:      2 weeks
  
  Revision  Changes    Path
  1.233     +23 -31    src/sys/kern/subr_smp.c