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

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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>
This commit is contained in:
Oleg Nesterov 2014-06-04 16:07:55 -07:00 committed by Linus Torvalds
parent 39af1765f1
commit dc6f6c97f1
1 changed files with 0 additions and 1 deletions
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init/main.c
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@ -507,7 +507,6 @@ asmlinkage __visible void __init start_kernel(void)
page_address_init(); page_address_init();
pr_notice("%s", linux_banner); pr_notice("%s", linux_banner);
setup_arch(&command_line); setup_arch(&command_line);
mm_init_owner(&init_mm, &init_task);
mm_init_cpumask(&init_mm); mm_init_cpumask(&init_mm);
setup_command_line(command_line); setup_command_line(command_line);
setup_nr_cpu_ids(); setup_nr_cpu_ids();