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[v9,1/7] mm: Define obj_cgroup_get() if CONFIG_MEMCG is not defined.

Message ID 20240930221221.6981-2-kanchana.p.sridhar@intel.com (mailing list archive)
State New
Headers show
Series mm: zswap swap-out of large folios | expand

Commit Message

Sridhar, Kanchana P Sept. 30, 2024, 10:12 p.m. UTC 
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@intel.com>
Reviewed-by: Nhat Pham <nphamcs@gmail.com>
Reviewed-by: Yosry Ahmed <yosryahmed@google.com>
Reviewed-by: Chengming Zhou <chengming.zhou@linux.dev>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
---
 include/linux/memcontrol.h | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

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)
 {
 }