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Message-ID: <3A32184F.547E7F8B@alsa-project.org>
Date: Sat, 09 Dec 2000 12:32:32 +0100
From: Abramo Bagnara <abramo@alsa-project.org>
Organization: Opera Unica
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To: G?rard Roudier <groudier@club-internet.fr>
CC: Linux Kernel <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@transmeta.com>,
        Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [2*PATCH] alpha I/O access and mb()
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G?rard Roudier wrote:
> 
> 
> Based on that, let me claim that most of blind barriers inserted this way
> are useless (thus sob-optimal) and may band-aid useful barriers that are
> missing. The result is subtle bugs, hidden most of the time, that we will
> have to suffer for decades.
> 
> The only way to do things right regarding ordering it to have device
> drivers _aware_ of such issues. Now, if we are happy with broken portable
> or platform-independant drivers that rely on broken hidden ordering
> alchemy rather than on correctness, then it is another story.

I see perfectly your point and this is the reason why we have
__raw_write[bwlq] in 2.4, but write[bwlq] expected semantic is to ensure
that write *happens* and are visible by other agents.

You can tell me that almost nobody uses __raw_write now and this is bad
and I agree with you, but sometime this is not a perfect world ;-)

-- 
Abramo Bagnara                       mailto:abramo@alsa-project.org

Opera Unica                          Phone: +39.546.656023
Via Emilia Interna, 140
48014 Castel Bolognese (RA) - Italy

ALSA project is            http://www.alsa-project.org
sponsored by SuSE Linux    http://www.suse.com

It sounds good!
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