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From: Fabien Thomas <fabient@FreeBSD.org>
Date: Wed, 31 Mar 2010 20:00:45 +0000 (UTC)
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Subject: svn commit: r205998 - head/sys/dev/hwpmc
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Author: fabient
Date: Wed Mar 31 20:00:44 2010
New Revision: 205998
URL: http://svn.freebsd.org/changeset/base/205998

Log:
  If there is multiple PMCs for the same interrupt ignore new post.
  This will indirectly fix a bug where the thread will be pinned
  forever if the assert is not compiled.
  
  MFC after: 3days

Modified:
  head/sys/dev/hwpmc/hwpmc_mod.c

Modified: head/sys/dev/hwpmc/hwpmc_mod.c
==============================================================================
--- head/sys/dev/hwpmc/hwpmc_mod.c	Wed Mar 31 18:37:00 2010	(r205997)
+++ head/sys/dev/hwpmc/hwpmc_mod.c	Wed Mar 31 20:00:44 2010	(r205998)
@@ -3972,9 +3972,11 @@ pmc_post_callchain_callback(void)
 
 	td = curthread;
 
-	KASSERT((td->td_pflags & TDP_CALLCHAIN) == 0,
-	    ("[pmc,%d] thread %p already marked for callchain capture",
-		__LINE__, (void *) td));
+	/*
+	 * If there is multiple PMCs for the same interrupt ignore new post
+	 */
+	if (td->td_pflags & TDP_CALLCHAIN)
+		return;
 
 	/*
 	 * Mark this thread as needing callchain capture.