Suspend 2 merge: 3/51: e820 table support

[Nigel Cunningham]

The first of the 'real' candidates for merging.

This adds support for setting and clearing the Nosave status of pages
based on the contents of the e820 table, and clearing Nosave for __init
pages when they're freed.

diff -ruN 208-e820-table-support-old/arch/i386/mm/init.c 208-e820-table-support-new/arch/i386/mm/init.c
--- 208-e820-table-support-old/arch/i386/mm/init.c	2004-11-03 21:54:38.000000000 +1100
+++ 208-e820-table-support-new/arch/i386/mm/init.c	2004-11-04 16:27:39.000000000 +1100
@@ -27,6 +27,7 @@
 #include <linux/slab.h>
 #include <linux/proc_fs.h>
 #include <linux/efi.h>
+#include <linux/suspend.h>
 
 #include <asm/processor.h>
 #include <asm/system.h>
@@ -266,12 +267,15 @@
 {
 	if (page_is_ram(pfn) && !(bad_ppro && page_kills_ppro(pfn))) {
 		ClearPageReserved(page);
+		ClearPageNosave(page);
 		set_bit(PG_highmem, &page->flags);
 		set_page_count(page, 1);
 		__free_page(page);
 		totalhigh_pages++;
-	} else
+	} else {
 		SetPageReserved(page);
+		SetPageNosave(page);
+	}
 }
 
 #ifndef CONFIG_DISCONTIGMEM
@@ -349,7 +353,7 @@
 #endif
 }
 
-#if defined(CONFIG_PM_DISK) || defined(CONFIG_SOFTWARE_SUSPEND)
+#ifdef CONFIG_PM
 /*
  * Swap suspend & friends need this for resume because things like the intel-agp
  * driver might have split up a kernel 4MB mapping.
@@ -569,6 +573,7 @@
 	int codesize, reservedpages, datasize, initsize;
 	int tmp;
 	int bad_ppro;
+	void * addr;
 
 #ifndef CONFIG_DISCONTIGMEM
 	if (!mem_map)
@@ -599,12 +604,25 @@
 	totalram_pages += __free_all_bootmem();
 
 	reservedpages = 0;
-	for (tmp = 0; tmp < max_low_pfn; tmp++)
-		/*
-		 * Only count reserved RAM pages
-		 */
-		if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp)))
-			reservedpages++;
+	addr = __va(0);
+	for (tmp = 0; tmp < max_low_pfn; tmp++, addr += PAGE_SIZE) {
+		if (page_is_ram(tmp)) {
+			/*
+			 * Only count reserved RAM pages
+			 */
+			if (PageReserved(mem_map+tmp))
+				reservedpages++;
+			/*
+			 * Mark nosave pages
+			 */
+			if (addr >= (void *)&__nosave_begin && addr < (void *)&__nosave_end)
+				SetPageNosave(mem_map+tmp);
+		} else
+			/*
+			 * Non-RAM pages are always nosave
+			 */
+			SetPageNosave(mem_map+tmp);
+	}
 
 	set_highmem_pages_init(bad_ppro);
 
@@ -703,6 +721,7 @@
 	addr = (unsigned long)(&__init_begin);
 	for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 		ClearPageReserved(virt_to_page(addr));
+		ClearPageNosave(virt_to_page(addr));
 		set_page_count(virt_to_page(addr), 1);
 		free_page(addr);
 		totalram_pages++;
@@ -717,6 +736,7 @@
 		printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 	for (; start < end; start += PAGE_SIZE) {
 		ClearPageReserved(virt_to_page(start));
+		ClearPageNosave(virt_to_page(start));
 		set_page_count(virt_to_page(start), 1);
 		free_page(start);
 		totalram_pages++;
diff -ruN 208-e820-table-support-old/mm/bootmem.c 208-e820-table-support-new/mm/bootmem.c
--- 208-e820-table-support-old/mm/bootmem.c	2004-11-03 21:53:00.000000000 +1100
+++ 208-e820-table-support-new/mm/bootmem.c	2004-11-04 16:27:39.000000000 +1100
@@ -279,11 +279,13 @@
 
 			count += BITS_PER_LONG;
 			__ClearPageReserved(page);
+			ClearPageNosave(page);
 			set_page_count(page, 1);
 			for (j = 1; j < BITS_PER_LONG; j++) {
 				if (j + 16 < BITS_PER_LONG)
 					prefetchw(page + j + 16);
 				__ClearPageReserved(page + j);
+				ClearPageNosave(page + j);
 			}
 			__free_pages(page, ffs(BITS_PER_LONG)-1);
 			i += BITS_PER_LONG;
@@ -294,6 +296,7 @@
 				if (v & m) {
 					count++;
 					__ClearPageReserved(page);
+					ClearPageNosave(page);
 					set_page_count(page, 1);
 					__free_page(page);
 				}
@@ -314,6 +317,7 @@
 	for (i = 0; i < ((bdata->node_low_pfn-(bdata->node_boot_start >> PAGE_SHIFT))/8 + PAGE_SIZE-1)/PAGE_SIZE; i++,page++) {
 		count++;
 		__ClearPageReserved(page);
+		ClearPageNosave(page);
 		set_page_count(page, 1);
 		__free_page(page);
 	}


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