linux-kernel - Re: [PATCH 9/11] Panic delay fix

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Message-ID: <d120d5000702081337j3eecbc41r4e9e44014b7cedfe@mail.gmail.com>
Date:	Thu, 8 Feb 2007 16:37:31 -0500
From:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
To:	"Zachary Amsden" <zach@...are.com>
Cc:	"Rusty Russell" <rusty@...tcorp.com.au>,
	"Pavel Machek" <pavel@....cz>, "Andi Kleen" <ak@....de>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...l.org>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"Chris Wright" <chrisw@...s-sol.org>
Subject: Re: [PATCH 9/11] Panic delay fix

On 2/8/07, Zachary Amsden <zach@...are.com> wrote:
> Dmitry Torokhov wrote:
> >
> > However I am not really fond of idea of adding constructs like this
> > all over the code:
> >
> > #define USE_REAL_TIME_DELAY_I_REALLY_MEAN_IT_THIS_TIME_I_SWEAR
> >
> > as the time passes... Drivers should be blissfully ignorant of being
> > run on virtual hardware.
>
> I agree in general, but there are two uses for this ugly construct.  One
> is for drivers and isolated sections of code which actually interact
> with the real world.  They need real time delays.  The only two examples
> so far are SMP coprocessor bootstrapping and blinking LEDs with a
> recognizable frequency.  I don't expect many more to show up.
>

I am pretty sure that using that construct inside of i8042 is wrong -
the host OS should handle hardware access/delay issues. Have you
verified that fixing kerne/panic.c to call i8042_panic_blink once per
1 ms (as it happens on native running kernel) does not produce the
desired blinking?

-- 
Dmitry
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