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Commit b5e6a5a2 authored by Cody P Schafer's avatar Cody P Schafer Committed by Linus Torvalds
Browse files

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: default avatarCody P Schafer <cody@linux.vnet.ibm.com>
Cc: David Hansen <dave@linux.vnet.ibm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent da3649e1

mm/page_alloc.c

+7 −0
Original line number Diff line number Diff line
@@ -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;

}