Messages in this thread | | | Date | Mon, 04 Jun 2012 11:30:40 +0900 | From | Minchan Kim <> | Subject | Re: WARNING: at mm/page-writeback.c:1990 __set_page_dirty_nobuffers+0x13a/0x170() |
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On 06/04/2012 10:26 AM, KOSAKI Motohiro wrote:
>> Right. I missed that. I think we can use the page passed to rescue_unmovable_pageblock. >> We make sure it's valid in isolate_freepages. So how about this? >> >> barrios@bbox:~/linux-2.6$ git diff >> diff --git a/mm/compaction.c b/mm/compaction.c >> index 4ac338a..7459ab5 100644 >> --- a/mm/compaction.c >> +++ b/mm/compaction.c >> @@ -368,11 +368,11 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc, >> static bool rescue_unmovable_pageblock(struct page *page) >> { >> unsigned long pfn, start_pfn, end_pfn; >> - struct page *start_page, *end_page; >> + struct page *start_page, *end_page, *cursor_page; >> >> pfn = page_to_pfn(page); >> start_pfn = pfn & ~(pageblock_nr_pages - 1); >> - end_pfn = start_pfn + pageblock_nr_pages; >> + end_pfn = start_pfn + pageblock_nr_pages - 1; >> >> start_page = pfn_to_page(start_pfn); >> end_page = pfn_to_page(end_pfn); >> @@ -381,19 +381,19 @@ static bool rescue_unmovable_pageblock(struct page *page) >> if (page_zone(start_page) != page_zone(end_page)) >> return false; >> >> - for (page = start_page, pfn = start_pfn; page < end_page; pfn++, >> - page++) { >> + for (cursor_page = start_page, pfn = start_pfn; cursor_page <= end_page; pfn++, >> + cursor_page++) { >> if (!pfn_valid_within(pfn)) >> continue; > > I guess page_zone() should be used after pfn_valid_within(). Why can > we assume invalid > pfn return correct zone?
Right you are. We can't make sure it in case of CONFIG_HOLES_IN_ZONE.
-- Kind regards, Minchan Kim
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