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From: Xiao Guangrong <guangrong.xiao@gmail.com>
To: paulmck@linux.vnet.ibm.com
Cc: peterz@infradead.org, rostedt@goodmis.org,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	stefani@seibold.net,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Is read barrier missed in kfifo?
Date: Fri, 11 May 2018 15:25:18 +0800	[thread overview]
Message-ID: <5382d3a8-08e0-5429-0cd3-36f9c69197e1@gmail.com> (raw)


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!

             reply	other threads:[~2018-05-11  7:25 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-11  7:25 Xiao Guangrong [this message]
2018-05-11  7:33 ` Stefani Seibold
2018-05-11  8:32 ` Peter Zijlstra
2018-05-11 16:20   ` Paul E. McKenney
2018-05-14  6:57     ` Peter Zijlstra
2018-05-14 13:25       ` Paul E. McKenney

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