[PATCH] swsusp: use bytes as image size units

Make swsusp use bytes as the image size units, which is needed for future
compatibility.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Documentation/power/interface.txt

@@ -44,7 +44,7 @@ it.
 /sys/power/image_size controls the size of the image created by
 the suspend-to-disk mechanism.  It can be written a string
 representing a non-negative integer that will be used as an upper
-limit of the image size, in megabytes.  The suspend-to-disk mechanism will
+limit of the image size, in bytes.  The suspend-to-disk mechanism will
 do its best to ensure the image size will not exceed that number.  However,
 if this turns out to be impossible, it will try to suspend anyway using the
 smallest image possible.  In particular, if "0" is written to this file, the

Documentation/power/swsusp.txt

@@ -27,7 +27,7 @@ echo shutdown > /sys/power/disk; echo disk > /sys/power/state
 
 echo platform > /sys/power/disk; echo disk > /sys/power/state
 
-If you want to limit the suspend image size to N megabytes, do
+If you want to limit the suspend image size to N bytes, do
 
 echo N > /sys/power/image_size
 

kernel/power/disk.c

@@ -367,14 +367,14 @@ power_attr(resume);
 
 static ssize_t image_size_show(struct subsystem * subsys, char *buf)
 {
-	return sprintf(buf, "%u\n", image_size);
+	return sprintf(buf, "%lu\n", image_size);
 }
 
 static ssize_t image_size_store(struct subsystem * subsys, const char * buf, size_t n)
 {
-	unsigned int size;
+	unsigned long size;
 
-	if (sscanf(buf, "%u", &size) == 1) {
+	if (sscanf(buf, "%lu", &size) == 1) {
 		image_size = size;
 		return n;
 	}

kernel/power/power.h

@@ -51,8 +51,8 @@ extern const void __nosave_begin, __nosave_end;
 extern unsigned int nr_copy_pages;
 extern struct pbe *pagedir_nosave;
 
-/* Preferred image size in MB (default 500) */
-extern unsigned int image_size;
+/* Preferred image size in bytes (default 500 MB) */
+extern unsigned long image_size;
 
 extern asmlinkage int swsusp_arch_suspend(void);
 extern asmlinkage int swsusp_arch_resume(void);

kernel/power/swsusp.c

@@ -70,12 +70,12 @@
 #include "power.h"
 
 /*
- * Preferred image size in MB (tunable via /sys/power/image_size).
+ * Preferred image size in bytes (tunable via /sys/power/image_size).
  * When it is set to N, swsusp will do its best to ensure the image
- * size will not exceed N MB, but if that is impossible, it will
+ * size will not exceed N bytes, but if that is impossible, it will
  * try to create the smallest image possible.
  */
-unsigned int image_size = 500;
+unsigned long image_size = 500 * 1024 * 1024;
 
 #ifdef CONFIG_HIGHMEM
 unsigned int count_highmem_pages(void);
@@ -590,7 +590,7 @@ int swsusp_shrink_memory(void)
 			if (!tmp)
 				return -ENOMEM;
 			pages += tmp;
-		} else if (size > (image_size * 1024 * 1024) / PAGE_SIZE) {
+		} else if (size > image_size / PAGE_SIZE) {
 			tmp = shrink_all_memory(SHRINK_BITE);
 			pages += tmp;
 		}