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From: Marcel Moolenaar <marcel@FreeBSD.org>
Date: Mon, 22 Mar 2010 04:24:19 +0000 (UTC)
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Subject: cvs commit: src/sys/ia64/ia64 pmap.c
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marcel      2010-03-22 04:24:19 UTC

  FreeBSD src repository

  Modified files:
    sys/ia64/ia64        pmap.c 
  Log:
  SVN rev 205435 on 2010-03-22 04:24:19Z by marcel
  
  Drop the pmap argument to pmap_invalidate_page(). It's not used other
  than in a KASSERT. The KASSERT is broken in that it's done outside the
  critical section and as such isn't protected against CPU migration.
  Improve pmap_invalidate_page() as follows:
  o   calculate vhpt_ofs inside the critical region for exactly the same
      reason.
  o   calculate the tag outside the FOREACH loop, as it's loop-invariant.
      This is more efficient.
  o   Replace the test and set with an atomic cmpset operation because we
      are changing other CPU's VHPT tables and this avoids invalidating
      after the entry got modified. Not necessarily a problem, but better
      safe than sorry.
  
  Revision  Changes    Path
  1.212     +17 -19    src/sys/ia64/ia64/pmap.c