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

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Date:   Mon, 23 Dec 2019 16:42:20 +0000
From:   Matt Fleming <matt@...eblueprint.co.uk>
To:     Gonsolo <gonsolo@...il.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        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>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH 1/1] Fix undefined reference to 'node_reclaim_distance'.

On Mon, 16 Dec, at 02:50:49PM, Gonsolo wrote:
> > 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.

Can someone test out this patch on one of the failing architectures?
(sh, ppc64)

---->8----

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 6ec1e595b1d4..bf20e5883026 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -1281,7 +1281,6 @@ static int			sched_domains_curr_level;
 int				sched_max_numa_distance;
 static int			*sched_domains_numa_distance;
 static struct cpumask		***sched_domains_numa_masks;
-int __read_mostly		node_reclaim_distance = RECLAIM_DISTANCE;
 #endif
 
 /*
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4785a8a2040e..733890d913ea 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3523,6 +3523,7 @@ bool zone_watermark_ok_safe(struct zone *z, unsigned int order,
 }
 
 #ifdef CONFIG_NUMA
+int __read_mostly		node_reclaim_distance = RECLAIM_DISTANCE;
 static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone)
 {
 	return node_distance(zone_to_nid(local_zone), zone_to_nid(zone)) <=