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>
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@ -507,7 +507,6 @@ asmlinkage __visible void __init start_kernel(void)
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page_address_init();
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pr_notice("%s", linux_banner);
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setup_arch(&command_line);
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mm_init_owner(&init_mm, &init_task);
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mm_init_cpumask(&init_mm);
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setup_command_line(command_line);
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setup_nr_cpu_ids();
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