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Message-ID: <540C1C01.1000308@plexistor.com>
Date: Sun, 07 Sep 2014 11:49:05 +0300
From: Yigal Korman <yigal@plexistor.com>
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To: Toshi Kani <toshi.kani@hp.com>, Andy Lutomirski <luto@amacapital.net>
CC: "H. Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, akpm@linuxfoundation.org,
        Arnd Bergmann <arnd@arndb.de>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Juergen Gross <jgross@suse.com>,
        Stefan Bader <stefan.bader@canonical.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [PATCH 4/5] x86, mm: Add set_memory_wt() for WT
References: <1409855739-8985-1-git-send-email-toshi.kani@hp.com>	 <1409855739-8985-5-git-send-email-toshi.kani@hp.com>	 <CALCETrXjpoVmCi07zo0dKH9LrF+nz9F3GshNiQvmiueFFH=TUQ@mail.gmail.com> <1409857025.28990.125.camel@misato.fc.hp.com>
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I think that what confused Andy (or at least me) is the documentation in Documentation/x86/pat.txt
If it's possible, can you please update pat.txt as part of the patch?

Thank you,
Yigal

On 04/09/2014 21:57, Toshi Kani wrote:
> 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@hp.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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