Hibernation: do not try to mark invalid PFNs as nosave

On some systems some PFNs reported by the early initialization code as
'nosave' may be invalid.  If we try to set the corresponding bits in the
hibernation bitmap, BUG_ON() in memory_bm_find_bit() will be triggered and
the system won't be able to boot (cf.
https://bugzilla.novell.com/show_bug.cgi?id=296242).

Prevent this from happening by verifying if the 'nosave' PFNs are valid in
mark_nosave_pages().

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rafael J. Wysocki 2007-08-10 13:00:57 -07:00 коммит произвёл Linus Torvalds
Родитель a75de1b379
Коммит c5a69adff9
1 изменённых файлов: 2 добавлений и 1 удалений

Просмотреть файл

@ -709,7 +709,8 @@ static void mark_nosave_pages(struct memory_bitmap *bm)
region->end_pfn << PAGE_SHIFT);
for (pfn = region->start_pfn; pfn < region->end_pfn; pfn++)
memory_bm_set_bit(bm, pfn);
if (pfn_valid(pfn))
memory_bm_set_bit(bm, pfn);
}
}