tracing: Don't call page_to_pfn() if page is NULL
authorWen Congyang <wency@cn.fujitsu.com>
Thu, 20 Sep 2012 06:04:47 +0000 (14:04 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 2 Oct 2012 17:30:08 +0000 (10:30 -0700)
commitc648535596087f7d17458c293d69829ff6e60a6c
treee53d6a8026ad35a0cadda0e812faa95c8ef054c4
parentdca2dd18c62e3b90cb71534e0a715d246ce7196d
tracing: Don't call page_to_pfn() if page is NULL

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@cn.fujitsu.com

Acked-by: Mel Gorman <mel@csn.ul.ie>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
include/trace/events/kmem.h