From owner-cvs-all  Mon Apr 16 21:18:13 2001
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From: John Baldwin <jhb@FreeBSD.org>
Date: Mon, 16 Apr 2001 21:18:08 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/alpha/alpha mp_machdep.c src/sys/i386/i386
         mp_machdep.c src/sys/kern kern_shutdown.c src/sys/powerpc/powerpc
         mp_machdep.c src/sys/sys kernel.h
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jhb         2001/04/16 21:18:08 PDT

  Modified files:
    sys/alpha/alpha      mp_machdep.c 
    sys/i386/i386        mp_machdep.c 
    sys/kern             kern_shutdown.c 
    sys/powerpc/powerpc  mp_machdep.c 
    sys/sys              kernel.h 
  Log:
  Blow away the panic mutex in favor of using a single atomic_cmpset() on a
  panic_cpu shared variable.  I used a simple atomic operation here instead
  of a spin lock as it seemed to be excessive overhead.  Also, this can avoid
  recursive panics if, for example, witness is broken.
  
  Revision  Changes    Path
  1.15      +1 -4      src/sys/alpha/alpha/mp_machdep.c
  1.153     +1 -5      src/sys/i386/i386/mp_machdep.c
  1.98      +10 -2     src/sys/kern/kern_shutdown.c
  1.5       +1 -5      src/sys/powerpc/powerpc/mp_machdep.c
  1.86      +1 -4      src/sys/sys/kernel.h


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