Re: [PATCH 1/1 v2] userfaultfd: use RCU to free the task struct when fork fails

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To: zhong jiang <zhongjiang@xxxxxxxxxx>
Subject: Re: [PATCH 1/1 v2] userfaultfd: use RCU to free the task struct when fork fails
From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Date: Mon, 29 Apr 2019 10:37:11 -0400
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxxxx>, linux-mm@xxxxxxxxx, syzkaller-bugs@xxxxxxxxxxxxxxxx, syzbot+cbb52e396df3e565ab02@xxxxxxxxxxxxxxxxxxxxxxxxx, Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>, Mike Kravetz <mike.kravetz@xxxxxxxxxx>, Peter Xu <peterx@xxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>
In-reply-to: <5CC69B6C.9090608@huawei.com>
References: <20190327084912.GC11927@dhcp22.suse.cz> <20190429035752.4508-1-aarcange@redhat.com> <5CC69B6C.9090608@huawei.com>
User-agent: Mutt/1.11.4 (2019-03-13)

Hello,

On Mon, Apr 29, 2019 at 02:36:28PM +0800, zhong jiang wrote:
> if we disable the CONFIG_MEMCG,  __delay_free_task will not to be used.

Yes, the compiler optimizes that away at build time.

Thanks,
Andrea

References:
- Re: [PATCH 1/2] userfaultfd: use RCU to free the task struct when fork fails
  - From: Michal Hocko
- [PATCH 1/1 v2] userfaultfd: use RCU to free the task struct when fork fails
  - From: Andrea Arcangeli
- Re: [PATCH 1/1 v2] userfaultfd: use RCU to free the task struct when fork fails
  - From: zhong jiang

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