Messages in this thread | | | Date | Sun, 9 Dec 2007 22:29:28 +0000 | From | Alan Cox <> | Subject | Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops |
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On Sun, 9 Dec 2007 22:25:13 +0100 Pavel Machek <pavel@ucw.cz> wrote:
> On Sun 2007-12-09 17:59:08, Andi Kleen wrote: > > > I mean, we expect 8usec delay -- historical ISA timing -- but when > > > _PCI_ card with leds is inserted, it is likely to be faster than old > > > ISA, right? > > > > Yes, i guess switching to udelay at least on newer systems would > > be a good idea. I'm not quite sure about systems without TSC though. > > Something like this? (Warning, will not probably even compile on > x86-64, I do not have 64-bit compiler near me).
You need to stick in a bug trap to verify that the udelay is not called before the cpu timer has been set up.
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