linux-kernel - Re: [PATCH v2 6/6] x86, pat: Update documentation for WT changes

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Message-ID: <CALCETrVnHg0X=R23qyiPtxYs3knHaXq65L0Jw_1oY4=gX5kpXQ@mail.gmail.com>
Date:	Wed, 10 Sep 2014 11:30:40 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Toshi Kani <toshi.kani@...com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Juergen Gross <jgross@...e.com>,
	Stefan Bader <stefan.bader@...onical.com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Yigal Korman <yigal@...xistor.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH v2 6/6] x86, pat: Update documentation for WT changes

On Wed, Sep 10, 2014 at 9:51 AM, Toshi Kani <toshi.kani@...com> wrote:
> +Drivers may map the entire NV-DIMM range with ioremap_cache and then change
> +a specific range to wt with set_memory_wt.

That's mighty specific :)

It's also not all that informative.  Are you supposed to set the
memory back before iounmapping?  Can you do this with set_memory_wc on
an uncached mapping?

--Andy
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