Re: [PATCH] ignore reads to the EOI register.

[Avi Kivity <avi@qumranet.com>]

Andi Kleen wrote:
> "Maciej W. Rozycki" <macro@linux-mips.org> writes:
>   
>>  Linux performs reads to all registers written including this one 
>> deliberately using an RMW cycle to avoid triggering an erratum in some 
>> early Pentium integrated APICs.  Obviously it does not matter for most of 
>> the world as the workaround is build-time conditional, but you'll get it 
>> if you build a generic "runs everywhere" kernel.
>>     
>
> It would be quite possible to make the cycle conditional on a
> cpufeatures.h quirk flag that is only set on P5. Just would need to
> out of line a few functions to avoid code bloat.
>   

Or, alternatives? xchg vs mov?

-- 
error compiling committee.c: too many arguments to function


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