[PARISC] Unbreak discontigmem mem_init()

The `simple' way of walking and checking PageReserved is broken on
discontigmem, instead we need to check each range explicitly.

(Also rename a few things so they make more sense.)
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

arch/parisc/mm/init.c

@@ -455,7 +455,6 @@ unsigned long pcxl_dma_start __read_mostly;
 void __init mem_init(void)
 {
 	int codesize, reservedpages, datasize, initsize;
-	int tmp;
 
 	high_memory = __va((max_pfn << PAGE_SHIFT));
 
@@ -470,17 +469,33 @@ void __init mem_init(void)
 			totalram_pages += free_all_bootmem_node(NODE_DATA(i));
 	}
 #endif
-	codesize =  (unsigned long) &_etext - (unsigned long) &_text;
-	datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
-	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
+
+	codesize = (unsigned long)_etext - (unsigned long)_text;
+	datasize = (unsigned long)_edata - (unsigned long)_etext;
+	initsize = (unsigned long)__init_end - (unsigned long)__init_begin;
 
 	reservedpages = 0;
-	for (tmp = 0; tmp < max_low_pfn; tmp++)
+{
+	unsigned long pfn;
+#ifdef CONFIG_DISCONTIGMEM
+	int i;
+
+	for (i = 0; i < npmem_ranges; i++) {
+		for (pfn = node_start_pfn(i); pfn < node_end_pfn(i); pfn++) {
+			if (PageReserved(pfn_to_page(pfn)))
+				reservedpages++;
+		}
+	}
+#else /* !CONFIG_DISCONTIGMEM */
+	for (pfn = 0; pfn < max_pfn; pfn++) {
 		/*
 		 * Only count reserved RAM pages
 		 */
-		if (PageReserved(pfn_to_page(tmp)))
+		if (PageReserved(pfn_to_page(pfn)))
 			reservedpages++;
+	}
+#endif
+}
 
 #ifdef CONFIG_PA11
 	if (hppa_dma_ops == &pcxl_dma_ops) {
@@ -494,20 +509,19 @@ void __init mem_init(void)
 	vmalloc_start = SET_MAP_OFFSET(MAP_START);
 #endif
 
-	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
-		(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
+	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",
+		(unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
 		num_physpages << (PAGE_SHIFT-10),
 		codesize >> 10,
 		reservedpages << (PAGE_SHIFT-10),
 		datasize >> 10,
-		initsize >> 10,
-		(unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))
-	       );
+		initsize >> 10
+	);
 
 #ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */
 	printk("virtual kernel memory layout:\n"
 	       "    vmalloc : 0x%p - 0x%p   (%4ld MB)\n"
-	       "    lowmem  : 0x%p - 0x%p   (%4ld MB)\n"
+	       "    memory  : 0x%p - 0x%p   (%4ld MB)\n"
 	       "      .init : 0x%p - 0x%p   (%4ld kB)\n"
 	       "      .data : 0x%p - 0x%p   (%4ld kB)\n"
 	       "      .text : 0x%p - 0x%p   (%4ld kB)\n",
@@ -518,14 +532,14 @@ void __init mem_init(void)
 	       __va(0), high_memory,
 	       ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
 
-	       &__init_begin, &__init_end,
-	       ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10,
+	       __init_begin, __init_end,
+	       ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
 
-	       &_etext, &_edata,
-	       ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
+	       _etext, _edata,
+	       ((unsigned long)_edata - (unsigned long)_etext) >> 10,
 
-	       &_text, &_etext,
-	       ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
+	       _text, _etext,
+	       ((unsigned long)_etext - (unsigned long)_text) >> 10);
 #endif
 }