linux-kernel - [PATCH] mm: debug: make bad_range() output more usable and readable

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Message-Id: <20140421180733.30BD5EFE@viggo.jf.intel.com>
Date:	Mon, 21 Apr 2014 11:07:33 -0700
From:	Dave Hansen <dave@...1.net>
To:	linux-kernel@...r.kernel.org
Cc:	linux-mm@...ck.org, akpm@...ux-foundation.org,
	Dave Hansen <dave@...1.net>, dave.hansen@...ux.intel.com
Subject: [PATCH] mm: debug: make bad_range() output more usable and readable


From: Dave Hansen <dave.hansen@...ux.intel.com>

Nobody outputs memory addresses in decimal.  PFNs are essentially
addresses, and they're gibberish in decimal.  Output them in hex.

Also, add the nid and zone name to give a little more context to
the message.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
---

 b/mm/page_alloc.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff -puN mm/page_alloc.c~range-in-hex mm/page_alloc.c
--- a/mm/page_alloc.c~range-in-hex	2014-04-21 10:11:32.274712151 -0700
+++ b/mm/page_alloc.c	2014-04-21 10:11:32.279712378 -0700
@@ -261,8 +261,9 @@ static int page_outside_zone_boundaries(
 	} while (zone_span_seqretry(zone, seq));
 
 	if (ret)
-		pr_err("page %lu outside zone [ %lu - %lu ]\n",
-			pfn, start_pfn, start_pfn + sp);
+		pr_err("page 0x%lx outside node %d zone %s [ 0x%lx - 0x%lx ]\n",
+			pfn, zone_to_nid(zone), zone->name,
+			start_pfn, start_pfn + sp);
 
 	return ret;
 }
_
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