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memcgroup: fix spurious EBUSY on memory cgroup removal
Call mm_free_cgroup earlier. Otherwise a reference due to lazy mm switching can prevent cgroup removal. Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Paul Menage <menage@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -394,7 +394,6 @@ void __mmdrop(struct mm_struct *mm)
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{
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BUG_ON(mm == &init_mm);
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mm_free_pgd(mm);
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mm_free_cgroup(mm);
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destroy_context(mm);
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free_mm(mm);
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}
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@ -416,6 +415,7 @@ void mmput(struct mm_struct *mm)
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spin_unlock(&mmlist_lock);
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}
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put_swap_token(mm);
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mm_free_cgroup(mm);
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mmdrop(mm);
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}
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}
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