linux-kernel - Re: [PATCH stable 5.10] mm: make zone_to_nid() and zone_set

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Date:   Fri, 13 Aug 2021 10:42:39 +0200
From:   Greg KH <greg@...ah.com>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     stable@...r.kernel.org, Geert Uytterhoeven <geert@...ux-m68k.org>,
        Finn Thain <fthain@...ux-m68k.org>,
        Mikael Pettersson <mikpelinux@...il.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org
Subject: Re: [PATCH stable 5.10] mm: make zone_to_nid() and zone_set_nid()
 available for DISCONTIGMEM

On Wed, Aug 11, 2021 at 04:41:39PM +0300, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@...ux.ibm.com>
> 
> 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