Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

["H. Peter Anvin" <hpa@zytor.com>]

Rene Herman wrote:
> On 16-12-07 16:22, Ingo Molnar wrote:
>
> > looks good to me. Could you please also provide three more controls 
> > that i suggested earlier:
> >
> >  - a boot option enabling/disabling the udelay based code
> >  - a .config method of enabling/disabling the udelay based code
> >  - a sysctl to toggle it
> >
> > if we want to clean this all up we'll need as many controls as possible.
>
> This version does the boot and the .config option but not the sysctl. It 
> makes for clumsy code and I don't believe it provides for much added 
> value as soon as you have the boot option. I am moreover not completely 
> confident about things such as paravirt liking the possibility of the 
> native_io_delay being changed out from under them at unpredictable times.

Incidentally, I had the thought earlier today that port 0xf0 might be a 
suitable delay port.  It is used only by the 387-emulating-a-287 hack 
for IRQ 13, which Linux doesn't use on 486+.

	-hpa
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