x86: unify __set_fixmap

In both cases, I went with the 32-bit behaviour.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/mm/init_64.c

@@ -213,18 +213,6 @@ void __init cleanup_highmap(void)
 	}
 }
 
-/* NOTE: this is meant to be run only at boot */
-void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
-{
-	unsigned long address = __fix_to_virt(idx);
-
-	if (idx >= __end_of_fixed_addresses) {
-		printk(KERN_ERR "Invalid __set_fixmap\n");
-		return;
-	}
-	set_pte_phys(address, phys, prot);
-}
-
 static unsigned long __initdata table_start;
 static unsigned long __meminitdata table_end;
 

arch/x86/mm/pgtable.c

@@ -274,3 +274,17 @@ int ptep_clear_flush_young(struct vm_area_struct *vma,
 
 	return young;
 }
+
+int fixmaps_set;
+
+void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags)
+{
+	unsigned long address = __fix_to_virt(idx);
+
+	if (idx >= __end_of_fixed_addresses) {
+		BUG();
+		return;
+	}
+	set_pte_pfn(address, phys >> PAGE_SHIFT, flags);
+	fixmaps_set++;
+}

arch/x86/mm/pgtable_32.c

@@ -145,18 +145,6 @@ static int fixmaps;
 unsigned long __FIXADDR_TOP = 0xfffff000;
 EXPORT_SYMBOL(__FIXADDR_TOP);
 
-void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags)
-{
-	unsigned long address = __fix_to_virt(idx);
-
-	if (idx >= __end_of_fixed_addresses) {
-		BUG();
-		return;
-	}
-	set_pte_pfn(address, phys >> PAGE_SHIFT, flags);
-	fixmaps++;
-}
-
 /**
  * reserve_top_address - reserves a hole in the top of kernel address space
  * @reserve - size of hole to reserve
@@ -166,7 +154,7 @@ void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags)
  */
 void reserve_top_address(unsigned long reserve)
 {
-	BUG_ON(fixmaps > 0);
+	BUG_ON(fixmaps_set > 0);
 	printk(KERN_INFO "Reserving virtual address space above 0x%08x\n",
 	       (int)-reserve);
 	__FIXADDR_TOP = -reserve - PAGE_SIZE;

include/asm-x86/fixmap.h

@@ -7,6 +7,8 @@
 # include "fixmap_64.h"
 #endif
 
+extern int fixmaps_set;
+
 extern void __set_fixmap(enum fixed_addresses idx,
 			 unsigned long phys, pgprot_t flags);
 #define set_fixmap(idx, phys)				\