Using a double cast to avoid compiler warnings when building for PAE. 
Compiler doesn't like direct casting of a 32 bit ptr to 64 bit integer.
Signed-off-by: NMartin J. Bligh <mbligh@google.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>