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

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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>
This commit is contained in:
Rafael J. Wysocki 2006-07-10 04:45:00 -07:00 committed by Linus Torvalds
parent 7ba1c6c88c
commit 95018f7c94
1 changed files with 8 additions and 2 deletions
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10
kernel/power/snapshot.c
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@ -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;
}
}