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From:   =?UTF-8?B?56a56Iif6ZSu?= <ufo19890607@gmail.com>
Date:   Sat, 2 Jun 2018 19:06:44 +0800
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Subject: [PATCH v7 1/2] Add an array of const char and enum oom_constraint in memcontrol.h
To:     akpm@linux-foundation.org, mhocko@suse.com, rientjes@google.com,
        kirill.shutemov@linux.intel.com, aarcange@redhat.com,
        penguin-kernel@i-love.sakura.ne.jp, guro@fb.com,
        yang.s@alibaba-inc.com
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Wind Yu <yuzhoujian@didichuxing.com>
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From: yuzhoujian <yuzhoujian@didichuxing.com>

This patch will make some preparation for the follow-up patch: Refactor
part of the oom report in dump_header. It puts enum oom_constraint in
memcontrol.h and adds an array of const char for each constraint.

Signed-off-by: yuzhoujian <yuzhoujian@didichuxing.com>
---
 include/linux/memcontrol.h | 14 ++++++++++++++
 mm/oom_kill.c              |  7 -------
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index d99b71bc2c66..57311b6c4d67 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -62,6 +62,20 @@ struct mem_cgroup_reclaim_cookie {
  unsigned int generation;
 };

+enum oom_constraint {
+ CONSTRAINT_NONE,
+ CONSTRAINT_CPUSET,
+ CONSTRAINT_MEMORY_POLICY,
+ CONSTRAINT_MEMCG,
+};
+
+static const char * const oom_constraint_text[] = {
+ [CONSTRAINT_NONE] = "CONSTRAINT_NONE",
+ [CONSTRAINT_CPUSET] = "CONSTRAINT_CPUSET",
+ [CONSTRAINT_MEMORY_POLICY] = "CONSTRAINT_MEMORY_POLICY",
+ [CONSTRAINT_MEMCG] = "CONSTRAINT_MEMCG",
+};
+
 #ifdef CONFIG_MEMCG

 #define MEM_CGROUP_ID_SHIFT 16
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 8ba6cb88cf58..c806cd656af6 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -237,13 +237,6 @@ unsigned long oom_badness(struct task_struct *p,
struct mem_cgroup *memcg,
  return points > 0 ? points : 1;
 }

-enum oom_constraint {
- CONSTRAINT_NONE,
- CONSTRAINT_CPUSET,
- CONSTRAINT_MEMORY_POLICY,
- CONSTRAINT_MEMCG,
-};
-
 /*
  * Determine the type of allocation constraint.
  */
-- 
2.14.1