linux-kernel - Re: Memory synchronization vs. interrupt handlers

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Message-ID: <521E5D58.5070708@zytor.com>
Date:	Wed, 28 Aug 2013 13:28:08 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Russell King <linux@....linux.org.uk>,
	Ingo Molnar <mingo@...hat.com>,
	David Howells <dhowells@...hat.com>,
	Ming Lei <ming.lei@...onical.com>,
	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Memory synchronization vs. interrupt handlers

On 08/28/2013 12:16 PM, Alan Stern wrote:
> Russell, Peter, and Ingo:
> 
> Can you folks enlighten us regarding this issue for some common 
> architectures?
> 

On x86, IRET is a serializing instruction; it guarantees hard
serialization of absolutely everything.

I would expect architectures that have weak memory ordering to put
appropriate barriers in the IRQ entry/exit code.

	-hpa

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