Re: [PATCH] NVMe: Fix compilation on architecturs without readq/writeq

[Geert Uytterhoeven]

On Sat, Feb 4, 2012 at 16:39, Hitoshi Mitake <h.mitake@xxxxxxxxx> wrote:
>> I worked myself on a driver (which sadly never shipped) which had an WC
>> window and a UC window... the final write in a series had a completion bit
>> in it and would go to the UC window after setting up a whole chunk of
>> operations in the WC window (writing UC memory flushes WC memory ahead of
>> it.)
>>
>> Thus, the two-part breakdown of writeq() to the UC window had to write the
>> low half to the WC window instead. ÂThis is clearly not generic.
>
> Because of my ignorant, I don't know the words "UC window" and "WC window"
> in this context. Could you teach me?

UN = uncached, WC = writecombining.

Gr{oetje,eeting}s,

            Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
             Â Â -- Linus Torvalds
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