linux-kernel - [PATCH v9 1/7] mm: Define obj_cgroup_get() if CONFIG

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Message-Id: <20240930221221.6981-2-kanchana.p.sridhar@intel.com>
Date: Mon, 30 Sep 2024 15:12:15 -0700
From: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>
To: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	hannes@...xchg.org,
	yosryahmed@...gle.com,
	nphamcs@...il.com,
	chengming.zhou@...ux.dev,
	usamaarif642@...il.com,
	shakeel.butt@...ux.dev,
	ryan.roberts@....com,
	ying.huang@...el.com,
	21cnbao@...il.com,
	akpm@...ux-foundation.org,
	willy@...radead.org
Cc: nanhai.zou@...el.com,
	wajdi.k.feghali@...el.com,
	vinodh.gopal@...el.com,
	kanchana.p.sridhar@...el.com
Subject: [PATCH v9 1/7] mm: Define obj_cgroup_get() if CONFIG_MEMCG is not defined.

This resolves an issue with obj_cgroup_get() not being defined if
CONFIG_MEMCG is not defined.

Before this patch, we would see build errors if obj_cgroup_get() is
called from code that is agnostic of CONFIG_MEMCG.

The zswap_store() changes for large folios in subsequent commits will
require the use of obj_cgroup_get() in zswap code that falls into this
category.

Signed-off-by: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>
Reviewed-by: Nhat Pham <nphamcs@...il.com>
Reviewed-by: Yosry Ahmed <yosryahmed@...gle.com>
Reviewed-by: Chengming Zhou <chengming.zhou@...ux.dev>
Acked-by: Johannes Weiner <hannes@...xchg.org>
---
 include/linux/memcontrol.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 34d2da05f2f1..15c2716f9aa3 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -1282,6 +1282,10 @@ struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css)
 	return NULL;
 }
 
+static inline void obj_cgroup_get(struct obj_cgroup *objcg)
+{
+}
+
 static inline void obj_cgroup_put(struct obj_cgroup *objcg)
 {
 }
-- 
2.27.0