Commit-ID: 85f2a2ef1d0ab99523e0b947a2b723f5650ed6aa Gitweb: http://git.kernel.org/tip/85f2a2ef1d0ab99523e0b947a2b723f5650ed6aa Author: Wen Congyang <wency@xxxxxxxxxxxxxx> AuthorDate: Thu, 20 Sep 2012 14:04:47 +0800 Committer: Steven Rostedt <rostedt@xxxxxxxxxxx> 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@xxxxxxxxxxxxxx Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: stable <stable@xxxxxxxxxxxxxxx> 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> --- 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) -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html