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Hibernation: do not try to mark invalid PFNs as nosave

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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 committed by Linus Torvalds
parent a75de1b379
commit c5a69adff9
1 changed files with 2 additions and 1 deletions
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3
kernel/power/snapshot.c
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@ -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);
}
}