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SubjectRe: [resend PATCH v2 11/33] dm: add dax_device and dax_operations support
On Fri, Jul 28 2017 at 12:17pm -0400,
Bart Van Assche <Bart.VanAssche@wdc.com> wrote:

> On Mon, 2017-04-17 at 12:09 -0700, Dan Williams wrote:
> > diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
> > index b7767da50c26..1de8372d9459 100644
> > --- a/drivers/md/Kconfig
> > +++ b/drivers/md/Kconfig
> > @@ -200,6 +200,7 @@ config BLK_DEV_DM_BUILTIN
> > config BLK_DEV_DM
> > tristate "Device mapper support"
> > select BLK_DEV_DM_BUILTIN
> > + select DAX
> > ---help---
> > Device-mapper is a low level volume manager. It works by allowing
> > people to specify mappings for ranges of logical sectors. Various
>
> (replying to an e-mail of three months ago)
>
> Hello Dan,
>
> While building a v4.12 kernel I noticed that enabling device mapper support
> now unconditionally enables DAX. I think there are plenty of systems that use
> dm but do not need DAX. Have you considered to rework this such that instead
> of dm selecting DAX that DAX support is only enabled in dm if CONFIG_DAX is
> enabled?

I haven't but patches to do so would be welcomed.

Mike

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