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

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Date:	Wed, 07 Feb 2007 14:23:50 -0800
From:	Zachary Amsden <zach@...are.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	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

Rusty Russell wrote:
> On Wed, 2007-02-07 at 12:35 +0000, Pavel Machek wrote:
>   
>> Ugh, it sounds like paravirt is more b0rken then I thought. It should
>> always to the proper delay, then replace those udelays that are not
>> needed on virtualized hardware with something else.
>>
>> Just magically defining udelay into nop is broken.
>>     
>
> We'd have to audit and figure out what udelays are for hardware and
> which are not, but the evidence is that the vast majority of them are
> for hardware and not needed for virtualization.
>
> Changing udelay to "hardware_udelay" or something all over the kernel
> would have delayed the paravirt_ops merge by an infinite amount 8)
>   

Yes, so I chose the same approach used for b0rken hardware - #define 
REALLY_SLOW_IO before including headers.  It's ugly, but it works 
without rewriting the entire source base.

Zach
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