Ingo Molnar wrote:
* H. Peter Anvin <[email protected]> wrote:
Pavel Machek wrote:
this is also something for v2.6.24 merging.
As much as I like this patch, I do not think it is suitable for
.24. Too risky, I'd say.
No kidding! We're talking about removing a hack that has been
successful on thousands of pieces of hardware over 15 years because it
^----[*]
breaks ONE machine.
[*] "- none of which needs it anymore -"
there, fixed it for you ;-)
So lets keep this in perspective: this is a hack that only helps on a
very low number of systems. (the PIT of one PII era chipset is known to
be affected)
Yes, but the status quo has been *tested* on thousands of systems and is
known to work. Thus, changing it puts things into unknown territory,
even if only a small number of machines actually need the current
configuration.
Heck, there are only a small number of 386/486 machines still in
operation and being actively updated.
unfortunately this hack's side-effects are mis-used by an unknown number
of drivers to mask PCI posting bugs. We want to figure out those bugs
(safely and carefully) and we want to remove this hack from modern
machines that dont need it. Doing anything else would be superstition.
anyway, we likely wont be doing anything about this in .24.
Again, 24 is "right out". 25 is a "maybe", IMO. Rene's fix could be an
exception, since it is a DMI-keyed workaround for a specific machine and
doesn't change behaviour in general.
-hpa
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