linux-kernel - [tip:perf/urgent] tracing: Don't call page_to

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Message-ID: <tip-85f2a2ef1d0ab99523e0b947a2b723f5650ed6aa@git.kernel.org>
Date:	Fri, 21 Sep 2012 05:37:52 -0700
From:	tip-bot for Wen Congyang <wency@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org, hpa@...or.com,
	mingo@...nel.org, minchan@...nel.org, mel@....ul.ie,
	stable@...r.kernel.org, wency@...fujitsu.com, fweisbec@...il.com,
	rostedt@...dmis.org, akpm@...ux-foundation.org, tglx@...utronix.de
Subject: [tip:perf/urgent] tracing: Don't call page_to_pfn()
  if page is NULL

Commit-ID:  85f2a2ef1d0ab99523e0b947a2b723f5650ed6aa
Gitweb:     http://git.kernel.org/tip/85f2a2ef1d0ab99523e0b947a2b723f5650ed6aa
Author:     Wen Congyang <wency@...fujitsu.com>
AuthorDate: Thu, 20 Sep 2012 14:04:47 +0800
Committer:  Steven Rostedt <rostedt@...dmis.org>
CommitDate: Thu, 20 Sep 2012 15:51:16 -0400

tracing: Don't call page_to_pfn() if page is NULL

When allocating memory fails, page is NULL. page_to_pfn() will
cause the kernel panicked if we don't use sparsemem vmemmap.

Link: http://lkml.kernel.org/r/505AB1FF.8020104@cn.fujitsu.com

Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: stable <stable@...r.kernel.org>
Acked-by: Mel Gorman <mel@....ul.ie>
Reviewed-by: Minchan Kim <minchan@...nel.org>
Signed-off-by: Wen Congyang <wency@...fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 include/trace/events/kmem.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/trace/events/kmem.h b/include/trace/events/kmem.h
index 5f889f1..08fa272 100644
--- a/include/trace/events/kmem.h
+++ b/include/trace/events/kmem.h
@@ -214,7 +214,7 @@ TRACE_EVENT(mm_page_alloc,
 
 	TP_printk("page=%p pfn=%lu order=%d migratetype=%d gfp_flags=%s",
 		__entry->page,
-		page_to_pfn(__entry->page),
+		__entry->page ? page_to_pfn(__entry->page) : 0,
 		__entry->order,
 		__entry->migratetype,
 		show_gfp_flags(__entry->gfp_flags))
@@ -240,7 +240,7 @@ DECLARE_EVENT_CLASS(mm_page,
 
 	TP_printk("page=%p pfn=%lu order=%u migratetype=%d percpu_refill=%d",
 		__entry->page,
-		page_to_pfn(__entry->page),
+		__entry->page ? page_to_pfn(__entry->page) : 0,
 		__entry->order,
 		__entry->migratetype,
 		__entry->order == 0)
--
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