path: root/mm/page_alloc.c
diff options
authorCody P Schafer <cody@linux.vnet.ibm.com>2013-02-22 16:35:28 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:20 -0800
commitb5e6a5a2724bc9f0b121062ab730d48731ae83e3 (patch)
treef40b4d3579fde06debac5fd36fa7355c89143cb3 /mm/page_alloc.c
parentmmzone: add pgdat_{end_pfn,is_empty}() helpers & consolidate. (diff)
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 <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: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
1 files changed, 7 insertions, 0 deletions
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;