linux-kernel - Re: [PATCH] drivers: net: xgene: fix: Out of order descriptor bytes read

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Message-ID: <1422307962.29618.31.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Mon, 26 Jan 2015 13:32:42 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Iyappan Subramanian <isubramanian@....com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, mlangsdo@...hat.com,
	patches <patches@....com>, Keyur Chudgar <kchudgar@....com>
Subject: Re: [PATCH] drivers: net: xgene: fix: Out of order descriptor bytes
 read

On Mon, 2015-01-26 at 13:27 -0800, Eric Dumazet wrote:

> What happens if you compile a kernel with CONFIG_SMP=n ?
> 
> 
> Most drivers in drivers/net use rmb() in this case, not smp_rmb() or
> barrier()

Note that dma_rmb() was recently added as well.



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