Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64with MCP51 laptops

[Alan Cox]

> Changing the delay instruction sequence from the outb to short jumps 
> might be the safe thing.  But Linus, et al. may have experience with 
> that on other architectures like older Pentiums etc.

Post boot we can use udelay() for this. Earlier I guess we could use
udelay and make sure it starts "safe" before we know the timing.

Alan
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