linux-kernel - Re: Is read barrier missed in kfifo?

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Date:   Fri, 11 May 2018 09:33:06 +0200
From:   Stefani Seibold <stefani@...bold.net>
To:     Xiao Guangrong <guangrong.xiao@...il.com>,
        paulmck@...ux.vnet.ibm.com
Cc:     peterz@...radead.org, rostedt@...dmis.org,
        Lai Jiangshan <jiangshanlai@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Is read barrier missed in kfifo?

My guts thinks you are right. Feel free to send a patch...

Am Freitag, den 11.05.2018, 15:25 +0800 schrieb Xiao Guangrong:
> Hi,
> 
> Currently, there is no read barrier between reading the index
> (kfifo.in) and fetching the real data from the fifo.
> 
> I am afraid that will cause the vfifo is observed as not empty
> however the data is not actually ready for read. Right?
> 
> Thanks!