From: David Rientjes <rientjes@google.com>
Date: Tue, 8 Sep 2015 22:00:44 +0000 (-0700)
Subject: mm, oom: add description of struct oom_control
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8989e4c7d4e3c30b55c998a1138cd06c92df7295;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

mm, oom: add description of struct oom_control

Describe the purpose of struct oom_control and what each member does.

Also make gfp_mask and order const since they are never manipulated or
passed to functions that discard the qualifier.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/include/linux/oom.h b/include/linux/oom.h
index 8fb67b9e6110..03e6257321f0 100644
--- a/include/linux/oom.h
+++ b/include/linux/oom.h
@@ -12,11 +12,25 @@ struct notifier_block;
 struct mem_cgroup;
 struct task_struct;
 
+/*
+ * Details of the page allocation that triggered the oom killer that are used to
+ * determine what should be killed.
+ */
 struct oom_control {
+	/* Used to determine cpuset */
 	struct zonelist *zonelist;
-	nodemask_t	*nodemask;
-	gfp_t		gfp_mask;
-	int		order;
+
+	/* Used to determine mempolicy */
+	nodemask_t *nodemask;
+
+	/* Used to determine cpuset and node locality requirement */
+	const gfp_t gfp_mask;
+
+	/*
+	 * order == -1 means the oom kill is required by sysrq, otherwise only
+	 * for display purposes.
+	 */
+	const int order;
 };
 
 /*