linux-kernel - Re: [PATCH] dax: Split pmd map when fallback on COW

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Message-ID: <CAPcyv4hafiv+EJaWGDhrV4Fe7=h=naALTwY0b=pfC2yfS7NShw@mail.gmail.com>
Date:	Mon, 23 Nov 2015 12:56:53 -0800
From:	Dan Williams <dan.j.williams@...el.com>
To:	Toshi Kani <toshi.kani@....com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Linux MM <linux-mm@...ck.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dax: Split pmd map when fallback on COW

On Mon, Nov 23, 2015 at 12:45 PM, Toshi Kani <toshi.kani@....com> wrote:
> On Mon, 2015-11-23 at 12:45 -0800, Dan Williams wrote:
>> On Mon, Nov 23, 2015 at 12:05 PM, Toshi Kani <toshi.kani@....com> wrote:
[..]
>> This is a nop if CONFIG_TRANSPARENT_HUGEPAGE=n, so I don't think it's
>> a complete fix.
>
> Well, __dax_pmd_fault() itself depends on CONFIG_TRANSPARENT_HUGEPAGE.
>

Indeed it is... I think that's wrong because transparent huge pages
rely on struct page??
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