From: Wen Congyang <wency@xxxxxxxxxxxxxx>
-------------------
This is a commit scheduled for the next v2.6.34 longterm release.
http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
If you see a problem with using this for longterm, please comment.
-------------------
commit 85f2a2ef1d0ab99523e0b947a2b723f5650ed6aa upstream.
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@xxxxxxxxxxxxxx
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Acked-by: Mel Gorman <mel@xxxxxxxxx>
Reviewed-by: Minchan Kim <minchan@xxxxxxxxxx>
Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>
---
include/trace/events/kmem.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/include/trace/events/kmem.h b/include/trace/events/kmem.h
index 3adca0ca9dbe..2018784c931a 100644
--- a/include/trace/events/kmem.h
+++ b/include/trace/events/kmem.h
@@ -250,7 +250,7 @@ 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))
@@ -276,7 +276,7 @@ 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)
--
1.8.5.2
--
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