linux-kernel - [PATCH 2/2 v6] mm/mempolicy: Don't create weight sysfs for memoryless nodes

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Message-ID: <20250226213518.767670-2-joshua.hahnjy@gmail.com>
Date: Wed, 26 Feb 2025 13:35:18 -0800
From: Joshua Hahn <joshua.hahnjy@...il.com>
To: gourry@...rry.net,
	harry.yoo@...cle.com,
	ying.huang@...ux.alibaba.com
Cc: honggyu.kim@...com,
	gregkh@...uxfoundation.org,
	rakie.kim@...com,
	akpm@...ux-foundation.org,
	rafael@...nel.org,
	lenb@...nel.org,
	dan.j.williams@...el.com,
	Jonathan.Cameron@...wei.com,
	dave.jiang@...el.com,
	horen.chuang@...ux.dev,
	hannes@...xchg.org,
	linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org,
	linux-mm@...ck.org,
	kernel-team@...a.com
Subject: [PATCH 2/2 v6] mm/mempolicy: Don't create weight sysfs for memoryless nodes

We should never try to allocate memory from a memoryless node. Creating a
sysfs knob to control its weighted interleave weight does not make sense,
and can be unsafe.

Only create weighted interleave weight knobs for nodes with memory.

Signed-off-by: Joshua Hahn <joshua.hahnjy@...il.com>
---
 mm/mempolicy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 4cc04ff8f12c..50cbb7c047fa 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -3721,7 +3721,7 @@ static int add_weighted_interleave_group(struct kobject *root_kobj)
 		return err;
 	}
 
-	for_each_node_state(nid, N_POSSIBLE) {
+	for_each_node_state(nid, N_MEMORY) {
 		err = add_weight_node(nid, wi_kobj);
 		if (err) {
 			pr_err("failed to add sysfs [node%d]\n", nid);
-- 
2.43.5