[PATCH] swsusp: do not use memcpy for snapshotting memory

swsusp should not use memcpy for snapshotting memory, because on some
architectures memcpy may increase preempt_count (i386 does this when
CONFIG_X86_USE_3DNOW is set).  Then, as a result, wrong value of preempt_count
is stored in the image.

Replace memcpy in copy_data_pages with an open-coded loop.

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>

1 files changed, 8 insertions, 2 deletions

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 24c96f354231..75d4886e648e 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -227,11 +227,17 @@ static void copy_data_pages(struct pbe *pblist)
                 for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) {
                         if (saveable(zone, &zone_pfn)) {
                                 struct page *page;
+                                long *src, *dst;
+                                int n;
+
                                 page = pfn_to_page(zone_pfn + zone->zone_start_pfn);
                                 BUG_ON(!pbe);
                                 pbe->orig_address = (unsigned long)page_address(page);
-                                /* copy_page is not usable for copying task structs. */
-                                memcpy((void *)pbe->address, (void *)pbe->orig_address, PAGE_SIZE);
+                                /* copy_page and memcpy are not usable for copying task structs. */
+                                dst = (long *)pbe->address;
+                                src = (long *)pbe->orig_address;
+                                for (n = PAGE_SIZE / sizeof(long); n; n--)
+                                        *dst++ = *src++;
                                 pbe = pbe->next;
                         }
                 }