-mm swsusp: copy_page is harmfull

-mm swsusp: copy_page is harmfull

[Pavel Machek]

Hi!

This is my fault from long time ago: copy_page can't be used for
copying task struct, therefore we can't use it in swsusp. Please
apply,

							Pavel

--- clean-mm/kernel/power/swsusp.c	2004-07-28 23:39:49.000000000 +0200
+++ linux-mm/kernel/power/swsusp.c	2004-07-28 23:30:33.000000000 +0200
@@ -614,12 +614,8 @@
 					struct page * page;
 					page = pfn_to_page(zone_pfn + zone->zone_start_pfn);
 					pbe->orig_address = (long) page_address(page);
-					/* Copy page is dangerous: it likes to mess with
-					   preempt count on specific cpus. Wrong preempt 
-					   count is then copied, oops. 
-					*/
-					copy_page((void *)pbe->address, 
-						  (void *)pbe->orig_address);
+					/* copy_page is no usable for copying task structs. */
+					memcpy((void *)pbe->address, (void *)pbe->orig_address, PAGE_SIZE);
 					pbe++;
 				}
 			}

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