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Date: Thu, 29 Nov 2018 03:08:30 +0000
From: Al Viro <viro@zeniv.linux.org.uk>
To: Yang Xiao <YangX92@hotmail.com>
Cc: "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH] fs: namespace: convert mnt_namespace.count from atomic_t
 to refcount_t
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On Thu, Nov 29, 2018 at 01:58:40AM +0000, Yang Xiao wrote:
> Hello, see commit 387ad9674b00 ("kernel: convert cgroup_namespace.count 
> from atomic_t to refcount_t") for detail.

That would be
    refcount_t type and corresponding API should be
    used instead of atomic_t when the variable is used as
    a reference counter. This allows to avoid accidental
    refcounter overflows that might lead to use-after-free
    situations.

AFAICS, that is the text you'd put into the original posting.  Verbatim.

Which additional information have I failed to notice in the commit
you'd mentioned?