linux-kernel - Re: [PATCH 4/5] x86, mm: Add set_memory

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Date:	Thu, 04 Sep 2014 12:57:05 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, akpm@...uxfoundation.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>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH 4/5] x86, mm: Add set_memory_wt() for WT

On Thu, 2014-09-04 at 11:57 -0700, Andy Lutomirski wrote:
> On Thu, Sep 4, 2014 at 11:35 AM, Toshi Kani <toshi.kani@...com> wrote:
> > This patch adds set_memory_wt(), set_memory_array_wt(), and
> > set_pages_array_wt() for setting range(s) of memory to WT.
> >
> 
> Possibly dumb question: I thought that set_memory_xyz was only for
> RAM.  Is that incorrect?

It works for non-RAM ranges as well.  For instance, you can use
set_memory_xyz() to change cache attribute for a non-RAM range mapped by
ioremap_cache().

Thanks,
-Toshi



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