linux-kernel - Re: [PATCH 1/1] Fix undefined reference to 'node_reclaim

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Date:   Mon, 16 Dec 2019 14:50:49 +0100
From:   Gonsolo <gonsolo@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH 1/1] Fix undefined reference to 'node_reclaim_distance'.

> The offending commit seems to be a55c7454a8c887b2 ("sched/topology:
> Improve load balancing on AMD EPYC systems").
>
> Probably the node_reclaim_distance variable should be moved from
> an SMP-specific file to a NUMA-specific file.

There are two variables that are used elsewhere:

int                             sched_max_numa_distance;

Used in kernel/sched/fair.c and kernel/sched/topology.c. I would move
it to fair.c.

int __read_mostly               node_reclaim_distance = RECLAIM_DISTANCE;

Used in
arch/x86/kernel/cpu/amd.c, line 894
kernel/sched/topology.c
mm/khugepaged.c, line 725
mm/page_alloc.c, line 3529

I'm not sure where to move this one.

-- 
g