[PATCH v6 03/13] mm/demotion: Return error on write to numa_demotion sysfs

From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: linux-mm@kvack.org, akpm@linux-foundation.org
Cc: Wei Xu <weixugc@google.com>, Huang Ying <ying.huang@intel.com>,
	Greg Thelen <gthelen@google.com>, Yang Shi <shy828301@gmail.com>,
	Davidlohr Bueso <dave@stgolabs.net>,
	Tim C Chen <tim.c.chen@intel.com>,
	Brice Goglin <brice.goglin@gmail.com>,
	Michal Hocko <mhocko@kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Hesham Almatary <hesham.almatary@huawei.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>,
	Alistair Popple <apopple@nvidia.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Feng Tang <feng.tang@intel.com>,
	Jagdish Gediya <jvgediya@linux.ibm.com>,
	Baolin Wang <baolin.wang@linux.alibaba.com>,
	David Rientjes <rientjes@google.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Subject: [PATCH v6 03/13] mm/demotion: Return error on write to numa_demotion sysfs
Date: Fri, 10 Jun 2022 19:22:19 +0530	[thread overview]
Message-ID: <20220610135229.182859-4-aneesh.kumar@linux.ibm.com> (raw)
In-Reply-To: <20220610135229.182859-1-aneesh.kumar@linux.ibm.com>

With CONFIG_MIGRATION disabled return EINVAL on write.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.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

