[PATCH RESEND 3/3] memcg: kill start_kernel()->mm_init_owner(&init_mm)

[Oleg Nesterov]

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@xxxxxxxxxx>
Reviewed-by: Michal Hocko <mhocko@xxxxxxx>
---
 init/main.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/init/main.c b/init/main.c
index 3815895..17090bb 100644
--- a/init/main.c
+++ b/init/main.c
@@ -507,7 +507,6 @@ asmlinkage 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();
-- 
1.5.5.1

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