Please apply commit 5045ea37377c ("powerpc/vdso64: Use double word ...") to v3.18.y

[Guenter Roeck <linux@xxxxxxxxxxxx>]

Hi Greg,

I am trying to get rid of antique compiler versions when building older
kernels. To assist that effort, it would help if you could apply commit
5045ea37377c ("powerpc/vdso64: Use double word compare on pointers")
to v3.18.y.

Thanks,
Guenter