From b5e6a5a2724bc9f0b121062ab730d48731ae83e3 Mon Sep 17 00:00:00 2001 From: Cody P Schafer Date: Fri, 22 Feb 2013 16:35:28 -0800 Subject: mm/page_alloc: add informative debugging message in page_outside_zone_boundaries() Add a debug message which prints when a page is found outside of the boundaries of the zone it should belong to. Format is: "page $pfn outside zone [ $start_pfn - $end_pfn ]" [akpm@linux-foundation.org: s/pr_debug/pr_err/] Signed-off-by: Cody P Schafer Cc: David Hansen Cc: Catalin Marinas Cc: Johannes Weiner Cc: Mel Gorman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/page_alloc.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'mm') diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 9614aabee8c5..a40b2f1cac2f 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -247,13 +247,20 @@ static int page_outside_zone_boundaries(struct zone *zone, struct page *page) int ret = 0; unsigned seq; unsigned long pfn = page_to_pfn(page); + unsigned long sp, start_pfn; do { seq = zone_span_seqbegin(zone); + start_pfn = zone->zone_start_pfn; + sp = zone->spanned_pages; if (!zone_spans_pfn(zone, pfn)) ret = 1; } while (zone_span_seqretry(zone, seq)); + if (ret) + pr_err("page %lu outside zone [ %lu - %lu ]\n", + pfn, start_pfn, start_pfn + sp); + return ret; } -- cgit v1.2.3