linux-kernel - Re: [QUESTION] llist: Comment releasing 'must delete' restriction before traversing

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Date:   Tue, 31 Jul 2018 09:37:50 +0800
From:   "Huang\, Ying" <ying.huang@...el.com>
To:     Byungchul Park <byungchul.park@....com>
Cc:     <linux-kernel@...r.kernel.org>, <kernel-team@....com>,
        <peterz@...radead.org>, <mingo@...nel.org>,
        <jiangshanlai@...il.com>, <paulmck@...ux.vnet.ibm.com>,
        <josh@...htriplett.org>, <rostedt@...dmis.org>,
        <mathieu.desnoyers@...icios.com>, <joel@...lfernandes.org>,
        <len.brown@...el.com>, <glider@...gle.com>,
        <peter@...leysoftware.com>, <aik@...abs.ru>
Subject: Re: [QUESTION] llist: Comment releasing 'must delete' restriction before traversing

Byungchul Park <byungchul.park@....com> writes:

> Hello folks,
>
> I'm careful in saying.. and curious about..
>
> In restrictive cases like only addtions happen but never deletion, can't
> we safely traverse a llist? I believe llist can be more useful if we can
> release the restriction. Can't we?
>
> If yes, we may add another function traversing starting from a head. Or
> just use existing funtion with head->first.
>
> Thank a lot for your answers in advance :)

What's the use case?  I don't know how it is useful that items are never
deleted from the llist.

Some other locks could be used to provide mutual exclusive between

- llist add, llist traverse

and

- llist delete

Is this your use case?

Best Regards,
Huang, Ying