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From: Colin Percival <cperciva@FreeBSD.org>
Date: Mon, 29 Nov 2010 06:50:30 +0000 (UTC)
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Subject: cvs commit: src/sys/i386/i386 machdep.c
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cperciva    2010-11-29 06:50:30 UTC

  FreeBSD src repository

  Modified files:
    sys/i386/i386        machdep.c 
  Log:
  SVN rev 216041 on 2010-11-29 06:50:30Z by cperciva
  
  Fix bug introduced by r194784: Under XEN, the page(s) allocated to dpcpu
  for CPU #0 weren't being properly reserved.  Under VM pressure this would
  cause problems when the dpcpu structures were overwritten by arbitrary
  data; the most common symptom was a panic when netisr attempted to lock a
  mutex.
  
  For some reason the XEN code keeps track of the start of available memory
  in the variables 'first', 'physfree', and 'init_first'; as far as I can
  tell, we always have first == physfree == init_first * PAGE_SIZE.  The
  earlier commit adjusted 'first' (which, on !XEN, is the only variable
  which tracks this value) but not the other two variables.
  
  Exercise for reader: Eliminate two of these three variables.
  
  Revision  Changes    Path
  1.715     +2 -0      src/sys/i386/i386/machdep.c