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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Fri, 5 Dec 2008 21:17:54 +0000 (UTC)
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Subject: cvs commit: src/sys/i386/include atomic.h
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kib         2008-12-05 21:17:54 UTC

  FreeBSD src repository

  Modified files:
    sys/i386/include     atomic.h 
  Log:
  SVN rev 185651 on 2008-12-05 21:17:54Z by kib
  
  Unconditionally use locked addition of zero to tip of the stack for
  memory barriers on i386. It works as a serialization instruction on
  all IA32 CPUs.
  
  Alternative solution of using {s,l,}fence requires run-time checking
  of the presense of the corresponding SSE or SSE2 extensions, and
  possible boot-time patching of the kernel text.
  
  Suggested by:   many
  
  Revision  Changes    Path
  1.50      +3 -14     src/sys/i386/include/atomic.h