From: "H. Peter Anvin" <hpa@zytor.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Russell King <linux@arm.linux.org.uk>,
Ingo Molnar <mingo@redhat.com>,
David Howells <dhowells@redhat.com>,
Ming Lei <ming.lei@canonical.com>,
USB list <linux-usb@vger.kernel.org>,
Kernel development list <linux-kernel@vger.kernel.org>
Subject: Re: Memory synchronization vs. interrupt handlers
Date: Wed, 28 Aug 2013 13:28:08 -0700 [thread overview]
Message-ID: <521E5D58.5070708@zytor.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1308281501000.1541-100000@iolanthe.rowland.org>
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
next prev parent reply other threads:[~2013-08-28 20:29 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CACVXFVMi8VU=m_XkdToAWtMDj-AJ2H+Jz6J4yy0=YWAweV1UMA@mail.gmail.com>
2013-08-26 15:49 ` Memory synchronization vs. interrupt handlers Alan Stern
2013-08-28 1:19 ` Paul E. McKenney
2013-08-28 19:16 ` Alan Stern
2013-08-28 20:28 ` H. Peter Anvin [this message]
2013-08-29 14:19 ` Alan Stern
2013-08-29 23:51 ` Paul E. McKenney
2013-08-30 0:14 ` Benjamin Herrenschmidt
2013-08-30 3:26 ` H. Peter Anvin
2013-09-02 11:43 ` Catalin Marinas
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