Messages in this thread Patch in this message | | | Date | Thu, 20 Sep 2012 14:04:47 +0800 | From | Wen Congyang <> | Subject | [PATCH] trace: don't call page_to_pfn() if page is NULL |
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When allocating memory fails, page is NULL. page_to_pfn() will cause the kernel panicked if we don't use sparsemem vmemmap.
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
--- 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) -- 1.7.1
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