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

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Message-ID: <CAMuHMdXvv_fvaUq_64_kOHCJ4+04uM_iw7aYxwOPU-Tg+g00-A@mail.gmail.com>
Date:	Sun, 5 Feb 2012 07:53:39 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Hitoshi Mitake <h.mitake@...il.com>
Cc:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	James Bottomley <jbottomley@...allels.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	Roland Dreier <roland@...estorage.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] NVMe: Fix compilation on architecturs without readq/writeq

On Sat, Feb 4, 2012 at 16:39, Hitoshi Mitake <h.mitake@...il.com> 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.  This 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@...ux-m68k.org

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.
                                -- Linus Torvalds
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