powerpc/powernv: Fix memtrace build when NUMA=n

[Michael Ellerman]

On Thu, 2018-05-10 at 13:09:13 UTC, Michael Ellerman wrote:
> Currently memtrace doesn't build if NUMA=n:
> 
>   In function ‘memtrace_alloc_node’:
>   arch/powerpc/platforms/powernv/memtrace.c:134:6:
>   error: the address of ‘contig_page_data’ will always evaluate as ‘true’
>     if (!NODE_DATA(nid) || !node_spanned_pages(nid))
>         ^
> 
> This is because for NUMA=n NODE_DATA(nid) points to an always
> allocated structure, contig_page_data.
> 
> But even in the NUMA=y case memtrace_alloc_node() is only called for
> online nodes, and we should always have a NODE_DATA() allocated for an
> online node. So remove the (hopefully) overly paranoid check, which
> also means we can build when NUMA=n.
> 
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>

Applied to powerpc next.

https://git.kernel.org/powerpc/c/8ccb442dec0ab53eefb5a607e405f7

cheers