ke[1]: *** [mm/failslab.o] Error 1
  make: *** [mm] Error 2

It gets included implicitly currently - but this will not be the
case with upcoming kmemtrace changes.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
LKML-Reference: <1237888761.25315.69.camel@penberg-laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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