From: Stuart Bennett <stuart@freedesktop.org>
Date: Tue, 28 Apr 2009 19:17:50 +0000 (+0100)
Subject: tracing: x86, mmiotrace: refactor clearing/restore of page presence
X-Git-Tag: v2.6.31-rc1~401^2~102
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=46e91d00b1165b14b484aa33800e1bba0794ae1a;p=pandora-kernel.git

tracing: x86, mmiotrace: refactor clearing/restore of page presence

* change function names to clear_* from set_*: in reality we only clear
  and restore page presence, and never unconditionally set present.
  Using clear_*({true, false}, ...) is therefore more honest than
  set_*({false, true}, ...)

* upgrade presence storage to pteval_t: doing user-space tracing will
  require saving and manipulation of the _PAGE_PROTNONE bit, in addition
  to the existing _PAGE_PRESENT changes, and having multiple bools stored
  and passed around does not seem optimal

[ Impact: refactor, clean up mmiotrace code ]

Signed-off-by: Stuart Bennett <stuart@freedesktop.org>
Acked-by: Pekka Paalanen <pq@iki.fi>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1240946271-7083-4-git-send-email-stuart@freedesktop.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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