linux-kernel - [PATCH 5.10.y 10/11] mm: memcontrol: move PageMemcgKmem to the scope of CONFIG_MEMCG

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Date:   Mon, 16 Aug 2021 07:21:46 +0000
From:   Chen Huang <chenhuang5@...wei.com>
To:     Roman Gushchin <guro@...com>,
        Muchun Song <songmuchun@...edance.com>,
        "Wang Hai" <wanghai38@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        <stable@...r.kernel.org>, Chen Huang <chenhuang5@...wei.com>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        "Xiongchun Duan" <duanxiongchun@...edance.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 5.10.y 10/11] mm: memcontrol: move PageMemcgKmem to the scope of CONFIG_MEMCG_KMEM

From: Muchun Song <songmuchun@...edance.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@...edance.com>
Acked-by: Roman Gushchin <guro@...com>
Reviewed-by: Shakeel Butt <shakeelb@...gle.com>
Acked-by: Johannes Weiner <hannes@...xchg.org>
Cc: Michal Hocko <mhocko@...nel.org>
Cc: Vladimir Davydov <vdavydov.dev@...il.com>
Cc: Xiongchun Duan <duanxiongchun@...edance.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Chen Huang <chenhuang5@...wei.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