diff options
| author | Rafael J. Wysocki <rjw@sisk.pl> | 2006-07-10 11:45:00 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-10 20:24:22 (GMT) |
| commit | 95018f7c94cbe4e78fc014b6ce52004714c06e2a (patch) | |
| tree | 2f8434103bc670813120e6d64b1726301a6021ac /kernel/power | |
| parent | 7ba1c6c88c945b065a75094830f6b76f414e42ad (diff) | |
| download | linux-95018f7c94cbe4e78fc014b6ce52004714c06e2a.tar.xz | |
[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>
Diffstat (limited to 'kernel/power')
| -rw-r--r-- | kernel/power/snapshot.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index 24c96f3..75d4886 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; } } |