x86: move find_max_low_pfn to init_32.c

Signed-off-by: NYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/setup_32.c

@@ -129,9 +129,6 @@ unsigned int BIOS_revision;
 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
 int bootloader_type;
 
-/* user-defined highmem size */
-static unsigned int highmem_pages = -1;
-
 /*
  * Early DMI memory
  */
@@ -187,21 +184,6 @@ static inline void copy_edd(void)
 }
 #endif
 
-/*
- * highmem=size forces highmem to be exactly 'size' bytes.
- * This works even on boxes that have no highmem otherwise.
- * This also works to reduce highmem size on bigger boxes.
- */
-static int __init parse_highmem(char *arg)
-{
-	if (!arg)
-		return -EINVAL;
-
-	highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
-	return 0;
-}
-early_param("highmem", parse_highmem);
-
 /*
  * vmalloc=size forces the vmalloc area to be exactly 'size'
  * bytes. This can be used to increase (or decrease) the
@@ -235,65 +217,6 @@ static int __init parse_reservetop(char *arg)
 }
 early_param("reservetop", parse_reservetop);
 
-/*
- * Determine low and high memory ranges:
- */
-unsigned long __init find_max_low_pfn(void)
-{
-	unsigned long max_low_pfn;
-
-	max_low_pfn = max_pfn;
-	if (max_low_pfn > MAXMEM_PFN) {
-		if (highmem_pages == -1)
-			highmem_pages = max_pfn - MAXMEM_PFN;
-		if (highmem_pages + MAXMEM_PFN < max_pfn)
-			max_pfn = MAXMEM_PFN + highmem_pages;
-		if (highmem_pages + MAXMEM_PFN > max_pfn) {
-			printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
-			highmem_pages = 0;
-		}
-		max_low_pfn = MAXMEM_PFN;
-#ifndef CONFIG_HIGHMEM
-		/* Maximum memory usable is what is directly addressable */
-		printk(KERN_WARNING "Warning only %ldMB will be used.\n",
-					MAXMEM>>20);
-		if (max_pfn > MAX_NONPAE_PFN)
-			printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
-		else
-			printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
-		max_pfn = MAXMEM_PFN;
-#else /* !CONFIG_HIGHMEM */
-#ifndef CONFIG_HIGHMEM64G
-		if (max_pfn > MAX_NONPAE_PFN) {
-			max_pfn = MAX_NONPAE_PFN;
-			printk(KERN_WARNING "Warning only 4GB will be used.\n");
-			printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
-		}
-#endif /* !CONFIG_HIGHMEM64G */
-#endif /* !CONFIG_HIGHMEM */
-	} else {
-		if (highmem_pages == -1)
-			highmem_pages = 0;
-#ifdef CONFIG_HIGHMEM
-		if (highmem_pages >= max_pfn) {
-			printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
-			highmem_pages = 0;
-		}
-		if (highmem_pages) {
-			if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
-				printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
-				highmem_pages = 0;
-			}
-			max_low_pfn -= highmem_pages;
-		}
-#else
-		if (highmem_pages)
-			printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
-#endif
-	}
-	return max_low_pfn;
-}
-
 #ifdef CONFIG_BLK_DEV_INITRD
 
 static bool do_relocate_initrd = false;

arch/x86/mm/init_32.c

@@ -540,8 +540,95 @@ static void __init set_nx(void)
 }
 #endif
 
+/* user-defined highmem size */
+static unsigned int highmem_pages = -1;
+
+/*
+ * highmem=size forces highmem to be exactly 'size' bytes.
+ * This works even on boxes that have no highmem otherwise.
+ * This also works to reduce highmem size on bigger boxes.
+ */
+static int __init parse_highmem(char *arg)
+{
+	if (!arg)
+		return -EINVAL;
+
+	highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
+	return 0;
+}
+early_param("highmem", parse_highmem);
+
+/*
+ * Determine low and high memory ranges:
+ */
+unsigned long __init find_max_low_pfn(void)
+{
+	unsigned long max_low_pfn;
+
+	max_low_pfn = max_pfn;
+	if (max_low_pfn > MAXMEM_PFN) {
+		if (highmem_pages == -1)
+			highmem_pages = max_pfn - MAXMEM_PFN;
+		if (highmem_pages + MAXMEM_PFN < max_pfn)
+			max_pfn = MAXMEM_PFN + highmem_pages;
+		if (highmem_pages + MAXMEM_PFN > max_pfn) {
+			printk(KERN_WARNING "only %luMB highmem pages "
+				"available, ignoring highmem size of %uMB.\n",
+				pages_to_mb(max_pfn - MAXMEM_PFN),
+				pages_to_mb(highmem_pages));
+			highmem_pages = 0;
+		}
+		max_low_pfn = MAXMEM_PFN;
+#ifndef CONFIG_HIGHMEM
+		/* Maximum memory usable is what is directly addressable */
+		printk(KERN_WARNING "Warning only %ldMB will be used.\n",
+					MAXMEM>>20);
+		if (max_pfn > MAX_NONPAE_PFN)
+			printk(KERN_WARNING
+				 "Use a HIGHMEM64G enabled kernel.\n");
+		else
+			printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
+		max_pfn = MAXMEM_PFN;
+#else /* !CONFIG_HIGHMEM */
+#ifndef CONFIG_HIGHMEM64G
+		if (max_pfn > MAX_NONPAE_PFN) {
+			max_pfn = MAX_NONPAE_PFN;
+			printk(KERN_WARNING "Warning only 4GB will be used."
+				"Use a HIGHMEM64G enabled kernel.\n");
+		}
+#endif /* !CONFIG_HIGHMEM64G */
+#endif /* !CONFIG_HIGHMEM */
+	} else {
+		if (highmem_pages == -1)
+			highmem_pages = 0;
+#ifdef CONFIG_HIGHMEM
+		if (highmem_pages >= max_pfn) {
+			printk(KERN_ERR "highmem size specified (%uMB) is "
+				"bigger than pages available (%luMB)!.\n",
+				pages_to_mb(highmem_pages),
+				pages_to_mb(max_pfn));
+			highmem_pages = 0;
+		}
+		if (highmem_pages) {
+			if (max_low_pfn - highmem_pages <
+			    64*1024*1024/PAGE_SIZE){
+				printk(KERN_ERR "highmem size %uMB results in "
+				"smaller than 64MB lowmem, ignoring it.\n"
+					, pages_to_mb(highmem_pages));
+				highmem_pages = 0;
+			}
+			max_low_pfn -= highmem_pages;
+		}
+#else
+		if (highmem_pages)
+			printk(KERN_ERR "ignoring highmem size on non-highmem"
+					" kernel!\n");
+#endif
+	}
+	return max_low_pfn;
+}
+
 #ifndef CONFIG_NEED_MULTIPLE_NODES
-extern unsigned long find_max_low_pfn(void);
 unsigned long __init initmem_init(unsigned long start_pfn,
 				  unsigned long end_pfn)
 {