x86: move page_is_ram() function

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/mm/init_32.c

@@ -211,28 +211,6 @@ static inline int page_kills_ppro(unsigned long pagenr)
 	return 0;
 }
 
-int page_is_ram(unsigned long pagenr)
-{
-	int i;
-	unsigned long addr, end;
-
-	for (i = 0; i < e820.nr_map; i++) {
-
-		if (e820.map[i].type != E820_RAM)	/* not usable memory */
-			continue;
-		/*
-		 *	!!!FIXME!!! Some BIOSen report areas as RAM that
-		 *	are not. Notably the 640->1Mb area. We need a sanity
-		 *	check here.
-		 */
-		addr = (e820.map[i].addr+PAGE_SIZE-1) >> PAGE_SHIFT;
-		end = (e820.map[i].addr+e820.map[i].size) >> PAGE_SHIFT;
-		if  ((pagenr >= addr) && (pagenr < end))
-			return 1;
-	}
-	return 0;
-}
-
 #ifdef CONFIG_HIGHMEM
 pte_t *kmap_pte;
 pgprot_t kmap_prot;

arch/x86/mm/ioremap.c

@@ -31,6 +31,30 @@ EXPORT_SYMBOL(__phys_addr);
 
 #endif
 
+int page_is_ram(unsigned long pagenr)
+{
+	unsigned long addr, end;
+	int i;
+
+	for (i = 0; i < e820.nr_map; i++) {
+		/*
+		 * Not usable memory:
+		 */
+		if (e820.map[i].type != E820_RAM)
+			continue;
+		/*
+		 *	!!!FIXME!!! Some BIOSen report areas as RAM that
+		 *	are not. Notably the 640->1Mb area. We need a sanity
+		 *	check here.
+		 */
+		addr = (e820.map[i].addr + PAGE_SIZE-1) >> PAGE_SHIFT;
+		end = (e820.map[i].addr + e820.map[i].size) >> PAGE_SHIFT;
+		if ((pagenr >= addr) && (pagenr < end))
+			return 1;
+	}
+	return 0;
+}
+
 /*
  * Fix up the linear direct mapping of the kernel to avoid cache attribute
  * conflicts.

include/asm-x86/page.h

@@ -47,6 +47,9 @@
 
 
 #ifndef __ASSEMBLY__
+
+extern int page_is_ram(unsigned long pagenr);
+
 struct page;
 
 static void inline clear_user_page(void *page, unsigned long vaddr,

include/asm-x86/page_32.h

@@ -73,7 +73,6 @@ extern int nx_enabled;
  */
 extern unsigned int __VMALLOC_RESERVE;
 extern int sysctl_legacy_va_layout;
-extern int page_is_ram(unsigned long pagenr);
 
 #define VMALLOC_RESERVE		((unsigned long)__VMALLOC_RESERVE)
 #define MAXMEM			(-__PAGE_OFFSET-__VMALLOC_RESERVE)