* Alan Cox <[EMAIL PROTECTED]> wrote:
> > So the current plan is to go with an io_delay=udelay default in v2.6.25,
> > to give this a migration window, and io_delay=none in v2.6.26 [and a
> > complete removal of arch/x86/kernel/io_delay.c], once the _p() uses are
> > fixed up. This is gradual enough to notice any regressions we care about
> > and also makes it nicely bisectable and gradual.
>
> You will break systems if you blindly go around disabling _p delays
> for ISA and LPC bus devices. The DEC Hinote laptops for example are
> well known for requiring the correct ISA and other keyboard controller
> delays. I don't expect anyone to test with a hinote or see it until it
> hits Debian or similar 'low resource' friendly devices.
well, using io_delay=udelay is not 'blindly disabling'. io_delay=none
would be the end goal, once all _p() API uses are eliminated by
transformation. In drivers/ alone that's more than 1000 callsites, so
it's quite frequently used, and wont go away overnight.
Ingo
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