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From: David Howells <dhowells@redhat.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Lennert Buytenhek <buytenh@wantstofly.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	ARM Linux Mailing List  <linux-arm-kernel@lists.arm.linux.org.uk>,
	Dan Williams <dan.j.williams@intel.com>,
	linux-kernel@vger.kernel.org, torvalds@osdl.org,
	paulmck@us.ibm.com
Subject: Re: I/O memory barriers vs SMP memory barriers
Date: Mon, 26 Mar 2007 11:07:23 +0100	[thread overview]
Message-ID: <4039.1174903643@redhat.com> (raw)
In-Reply-To: <1174767387.10836.107.camel@localhost.localdomain>

Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:

> Hrm... I'm not sure I like the io_* name, I think it's even more
> confusing, people will never know when to use what ...

I'd've thought it more obvious, but given there are several types of I/O, some
of which might require different barriering to others, I can see your point.

However, I think mb() unadorned is also confusing.

> Maybe we should dig out again my attempt at properly defining semantics
> of IO accessors and related barriers and extend it to include CPU vs.
> DMA barriers.

That could be useful.

David

      parent reply	other threads:[~2007-03-26 10:08 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20070323111350.GD3980@xi.wantstofly.org>
     [not found] ` <e9c3a7c20703021312y5f7aa228i5d1c84a8e9ea5676@mail.gmail.com>
     [not found]   ` <20070303111427.GB16944@xi.wantstofly.org>
     [not found]     ` <20070303113305.GB10515@flint.arm.linux.org.uk>
     [not found]       ` <20070321221134.GA22497@xi.wantstofly.org>
     [not found]         ` <tnxlkhpgslz.fsf@arm.com>
2007-03-23 13:43           ` David Howells
2007-03-23 15:08             ` Lennert Buytenhek
2007-03-24 20:16             ` Benjamin Herrenschmidt
2007-03-25 21:15             ` Paul E. McKenney
2007-03-25 21:38               ` Lennert Buytenhek
2007-03-26  3:24                 ` Paul E. McKenney
2007-03-26  8:46                   ` Lennert Buytenhek
2007-03-26 20:07                     ` Paul E. McKenney
2007-03-28 18:36                       ` Lennert Buytenhek
2007-03-26 10:04               ` David Howells
2007-03-26 10:07             ` David Howells [this message]

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