linux-kernel - [PATCH 2/2] topology: Guard node_reclaim_distance with CONFIFG

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Date:   Fri, 26 Feb 2021 12:17:21 -0800
From:   Palmer Dabbelt <palmer@...belt.com>
To:     akpm@...ux-foundation.org, atishp@...shpatra.org
Cc:     peterz@...radead.org, srikar@...ux.vnet.ibm.com,
        valentin.schneider@....com, vbabka@...e.cz, mpe@...erman.id.au,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kernel-team@...roid.com
Subject: [PATCH 2/2] topology: Guard node_reclaim_distance with CONFIFG_NUMA

From: Palmer Dabbelt <palmerdabbelt@...gle.com>

This is only defined (and useful) for CONFIG_NUMA, but isn't
conditionally declared.  This makes users a bit more of a headache to
track down.

Signed-off-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
---
 include/linux/topology.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/topology.h b/include/linux/topology.h
index 7634cd737061..15f02281bdf0 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -73,7 +73,9 @@ int arch_update_cpu_topology(void);
  * *improves* if allowed to reclaim memory and load balance tasks
  * between NUMA nodes 2-hops apart.
  */
+#ifdef CONFIG_NUMA
 extern int __read_mostly node_reclaim_distance;
+#endif
 
 #ifndef PENALTY_FOR_NODE_WITH_CPUS
 #define PENALTY_FOR_NODE_WITH_CPUS	(1)
-- 
2.30.1.766.gb4fecdf3b7-goog