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From: "Huang\, Ying" <ying.huang@intel.com>
To: Byungchul Park <byungchul.park@lge.com>
Cc: <linux-kernel@vger.kernel.org>, <kernel-team@lge.com>,
	<peterz@infradead.org>, <mingo@kernel.org>,
	<jiangshanlai@gmail.com>, <paulmck@linux.vnet.ibm.com>,
	<josh@joshtriplett.org>, <rostedt@goodmis.org>,
	<mathieu.desnoyers@efficios.com>, <joel@joelfernandes.org>,
	<len.brown@intel.com>, <glider@google.com>,
	<peter@hurleysoftware.com>, <aik@ozlabs.ru>
Subject: Re: [QUESTION] llist: Comment releasing 'must delete' restriction before traversing
Date: Tue, 31 Jul 2018 13:45:54 +0800	[thread overview]
Message-ID: <8736w0gdpp.fsf@yhuang-dev.intel.com> (raw)
In-Reply-To: <20180731052551.GA12241@X58A-UD3R> (Byungchul Park's message of "Tue, 31 Jul 2018 14:25:51 +0900")

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

> On Tue, Jul 31, 2018 at 09:37:50AM +0800, Huang, Ying wrote:
>> Byungchul Park <byungchul.park@lge.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
>
> Hello Huang,

Hello Byungchul,

> In my use case, I only do adding and traversing on a llist.

Can you provide more details about your use case?

Best Regards,
Huang, Ying

>> 
>> and
>> 
>> - llist delete
>
> Of course, I will use a lock when deletion is needed.
>
> So.. in the case only adding into and traversing a llist is needed,
> can't we safely traverse a llist in the way I thought? Or am I missing
> something?
>
> Thank you.
>
>> Is this your use case?
>> 
>> Best Regards,
>> Huang, Ying

  reply	other threads:[~2018-07-31  5:46 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-31  0:58 [QUESTION] llist: Comment releasing 'must delete' restriction before traversing Byungchul Park
2018-07-31  1:37 ` Huang, Ying
2018-07-31  5:25   ` Byungchul Park
2018-07-31  5:45     ` Huang, Ying [this message]
2018-07-31  4:30 ` Paul E. McKenney
2018-07-31  9:29   ` Byungchul Park
2018-07-31 14:30     ` Paul E. McKenney
2018-08-01  5:34       ` Byungchul Park
2018-08-01  5:43     ` Huang, Ying
2018-08-01  8:52       ` Byungchul Park
2018-07-31  8:52 ` Peter Zijlstra
2018-07-31  9:38   ` Byungchul Park
2018-07-31 13:46     ` Steven Rostedt
2018-08-01  5:35       ` Byungchul Park

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