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