From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 4 Jun 2014 23:07:55 +0000 (-0700)
Subject: memcg: kill start_kernel()->mm_init_owner(&init_mm)
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=dc6f6c97f1d3d58fef81f0f9db0c7d068b2cf392;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

memcg: kill start_kernel()->mm_init_owner(&init_mm)

Remove start_kernel()->mm_init_owner(&init_mm, &init_task).

This doesn't really hurt but unnecessary and misleading.  init_task is the
"swapper" thread == current, its ->mm is always NULL.  And init_mm can
only be used as ->active_mm, not as ->mm.

mm_init_owner() has a single caller with this patch, perhaps it should
die.  mm_init() can initialize ->owner under #ifdef.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Peter Chiang <pchiang@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/init/main.c b/init/main.c
index 48655ceb66f4..e08c0b2065a1 100644
--- a/init/main.c
+++ b/init/main.c
@@ -507,7 +507,6 @@ asmlinkage __visible void __init start_kernel(void)
 	page_address_init();
 	pr_notice("%s", linux_banner);
 	setup_arch(&command_line);
-	mm_init_owner(&init_mm, &init_task);
 	mm_init_cpumask(&init_mm);
 	setup_command_line(command_line);
 	setup_nr_cpu_ids();