From owner-cvs-all  Wed Mar 28  8:11:57 2001
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From: John Baldwin <jhb@FreeBSD.org>
Date: Wed, 28 Mar 2001 08:11:52 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/kern subr_witness.c
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jhb         2001/03/28 08:11:52 PST

  Modified files:
    sys/kern             subr_witness.c 
  Log:
  Close a race condition where if we were obtaining a sleep lock and no spin
  locks were held, we could be preempted and switch CPU's in between the time
  that we set a variable to the list of spin locks on our CPU and the time
  that we checked that variable to ensure no spinlocks were held while
  grabbing a sleep lock.  Losing the race resulted in checking some other
  CPU's spin lock list and bogusly panicing.
  
  Revision  Changes    Path
  1.61      +15 -2     src/sys/kern/subr_witness.c


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