>  > 
quoted text
>  > The answer to this question this is platform dependent.
>  > 
>  > On most 64-bit platforms, it is.  On some 32-bit ones, it is not.
> 
> Are there any 32-bit platforms with writeq()?  A quick grep 
> suggests not.

I think writeq defined in include/asm-x86/io_64.h

quoted text
> 
> Are there any 64-bit platforms where writeq() allows the MMIO to be
> split into multiple cycles from the target device's view?  I've been
> coding assuming that at least no other MMIO writes will reach 
> the device
> in the middle of a writeq().
> 

I hope that is the case.
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