Re: [PATCH 2/2] arm64: mm: enable CONFIG_HOLES_IN_ZONE for NUMA

[Robert Richter]

On 14.12.16 09:11:47, Ard Biesheuvel wrote:
> The NUMA code may get confused by the presence of NOMAP regions within
> zones, resulting in spurious BUG() checks where the node id deviates
> from the containing zone's node id.
> 
> Since the kernel has no business reasoning about node ids of pages it
> does not own in the first place, enable CONFIG_HOLES_IN_ZONE to ensure
> that such pages are disregarded.
> 
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>

I would rather see a solution other than making pfn_valid checks more
fine grained, but this patch also fixes the issue. So:

Acked-by: Robert Richter <rrichter@xxxxxxxxxx>