Re: [PATCH stable 5.10] mm: make zone_to_nid() and zone_set_nid() available for DISCONTIGMEM

[Greg KH]

On Wed, Aug 11, 2021 at 04:41:39PM +0300, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@xxxxxxxxxxxxx>
> 
> Since the commit ce6ee46e0f39 ("mm/page_alloc: fix memory map
> initialization for descending nodes") initialization of the memory map
> relies on availability of zone_to_nid() and zone_set_nid methods to link
> struct page to a node.
> 
> But in 5.10 zone_to_nid() is only defined for NUMA, but not for
> DISCONTIGMEM which causes crashes on m68k systems with two memory banks.
> 

Many thanks for the work done to figure this out and fix it.  Now queued
up.

greg k-h