lib: fix build failure in CONFIG_DEBUG_VIRTUAL test

[Michael Ellerman]

On Mon, 2018-12-10 at 08:08:28 UTC, Christophe Leroy wrote:
> On several arches, virt_to_phys() is in io.h
> 
> Build fails without it:
> 
>   CC      lib/test_debug_virtual.o
> lib/test_debug_virtual.c: In function 'test_debug_virtual_init':
> lib/test_debug_virtual.c:26:7: error: implicit declaration of function 'virt_to_phys' [-Werror=implicit-function-declaration]
>   pa = virt_to_phys(va);
>        ^
> 
> Fixes: e4dace361552 ("lib: add test module for CONFIG_DEBUG_VIRTUAL")
> CC: stable at vger.kernel.org
> Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>
> Reviewed-by: Kees Cook <keescook at chromium.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/10fdf838e5f540beca466e9d132599

cheers