x86, mm: Call is_untracked_pat_range() rather than is_ISA_range()

Checkin fd12a0d6 made the PAT
untracked range a platform configurable, but missed on occurrence of
is_ISA_range() which still refers to PAT-untracked memory, and
therefore should be using the configurable.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <20091119202341.GA4420@sgi.com>

arch/x86/include/asm/pgtable.h

@@ -16,6 +16,8 @@
 
 #ifndef __ASSEMBLY__
 
+#include <asm/x86_init.h>
+
 /*
  * ZERO_PAGE is a global shared page that is always zero: used
  * for zero-mapped memory areas etc..
@@ -270,9 +272,9 @@ static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
 					 unsigned long new_flags)
 {
 	/*
-	 * PAT type is always WB for ISA. So no need to check.
+	 * PAT type is always WB for untracked ranges, so no need to check.
 	 */
-	if (is_ISA_range(paddr, paddr + size - 1))
+	if (x86_platform.is_untracked_pat_range(paddr, paddr + size - 1))
 		return 1;
 
 	/*