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Subject[PATCH 5.10.y 10/11] mm: memcontrol: move PageMemcgKmem to the scope of CONFIG_MEMCG_KMEM
Date
From: Muchun Song <songmuchun@bytedance.com>

The page only can be marked as kmem when CONFIG_MEMCG_KMEM is enabled.
So move PageMemcgKmem() to the scope of the CONFIG_MEMCG_KMEM.

As a bonus, on !CONFIG_MEMCG_KMEM build some code can be compiled out.

Link: https://lkml.kernel.org/r/20210319163821.20704-8-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Chen Huang <chenhuang5@huawei.com>
---
include/linux/memcontrol.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index b8bb5d37d4ad..f07463cf7dac 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -506,6 +506,7 @@ static inline struct mem_cgroup *page_memcg_check(struct page *page)
return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
}

+#ifdef CONFIG_MEMCG_KMEM
/*
* PageMemcgKmem - check if the page has MemcgKmem flag set
* @page: a pointer to the page struct
@@ -520,7 +521,6 @@ static inline bool PageMemcgKmem(struct page *page)
return page->memcg_data & MEMCG_DATA_KMEM;
}

-#ifdef CONFIG_MEMCG_KMEM
/*
* page_objcgs - get the object cgroups vector associated with a page
* @page: a pointer to the page struct
@@ -575,6 +575,11 @@ static inline bool set_page_objcgs(struct page *page,
MEMCG_DATA_OBJCGS);
}
#else
+static inline bool PageMemcgKmem(struct page *page)
+{
+ return false;
+}
+
static inline struct obj_cgroup **page_objcgs(struct page *page)
{
return NULL;
--
2.18.0.huawei.25
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