linux-kernel - [PATCH v6 03/13] mm/demotion: Return error on write to numa

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Date:   Fri, 10 Jun 2022 19:22:19 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     linux-mm@...ck.org, akpm@...ux-foundation.org
Cc:     Wei Xu <weixugc@...gle.com>, Huang Ying <ying.huang@...el.com>,
        Greg Thelen <gthelen@...gle.com>,
        Yang Shi <shy828301@...il.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Tim C Chen <tim.c.chen@...el.com>,
        Brice Goglin <brice.goglin@...il.com>,
        Michal Hocko <mhocko@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hesham Almatary <hesham.almatary@...wei.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Alistair Popple <apopple@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Feng Tang <feng.tang@...el.com>,
        Jagdish Gediya <jvgediya@...ux.ibm.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        David Rientjes <rientjes@...gle.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Subject: [PATCH v6 03/13] mm/demotion: Return error on write to numa_demotion sysfs

With CONFIG_MIGRATION disabled return EINVAL on write.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
---
 mm/memory-tiers.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c
index 9c6b40d7e0bf..c3123a457d90 100644
--- a/mm/memory-tiers.c
+++ b/mm/memory-tiers.c
@@ -105,6 +105,9 @@ static ssize_t numa_demotion_enabled_store(struct kobject *kobj,
 {
 	ssize_t ret;
 
+	if (!IS_ENABLED(CONFIG_MIGRATION))
+		return -EINVAL;
+
 	ret = kstrtobool(buf, &numa_demotion_enabled);
 	if (ret)
 		return ret;
-- 
2.36.1