--- pmap.c.orig	2009-09-21 11:14:53.000000000 -0400
+++ pmap.c	2009-09-21 11:15:01.000000000 -0400
@@ -992,9 +992,10 @@
 	KASSERT((eva & PAGE_MASK) == 0,
 	    ("pmap_invalidate_cache_range: eva not page-aligned"));
 
-	if (cpu_feature & CPUID_SS)
+	if (cpu_feature & CPUID_SS) {
 		; /* If "Self Snoop" is supported, do nothing. */
-	else if (cpu_feature & CPUID_CLFSH) {
+#ifdef MAYBE_09_21_2009
+	} else if (cpu_feature & CPUID_CLFSH) {
 
 		/*
 		 * Otherwise, do per-cache line flush.  Use the mfence
@@ -1007,6 +1008,7 @@
 		for (; sva < eva; sva += cpu_clflush_line_size)
 			clflush(sva);
 		mfence();
+#endif // MAYBE_09_21_2009
 	} else {
 
 		/*