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Date: Tue, 31 Oct 2017 14:37:32 -0700
From: Davidlohr Bueso <dave@stgolabs.net>
To: Waiman Long <longman@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>, Jan Kara <jack@suse.com>,
        Jeff Layton <jlayton@poochiereds.net>,
        "J. Bruce Fields" <bfields@fieldses.org>, Tejun Heo <tj@kernel.org>,
        Christoph Lameter <cl@linux-foundation.org>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        Ingo Molnar <mingo@redhat.com>, Peter Zijlstra <peterz@infradead.org>,
        Andi Kleen <andi@firstfloor.org>, Dave Chinner <dchinner@redhat.com>,
        Boqun Feng <boqun.feng@gmail.com>
Subject: Re: [PATCH v8 1/6] lib/dlock-list: Distributed and lock-protected
 lists
Message-ID: <20171031213732.2nqqbdefvxxorg52@linux-n805>
References: <1509475860-16139-1-git-send-email-longman@redhat.com>
 <1509475860-16139-2-git-send-email-longman@redhat.com>
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On Tue, 31 Oct 2017, Waiman Long wrote:

>+void dlock_lists_del(struct dlock_list_node *node)
>+{
>+	struct dlock_list_head *head;
>+	bool retry;
>+
>+	do {
>+		head = READ_ONCE(node->head);

Boqun had previously pointed this out; you need to WRITE_ONCE() node->head too.

Thanks,
Davidlohr