linux-kernel - [PATCH v3 0/2] dax, dm: stop requiring dax for device-mapper

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Date:   Wed, 02 Aug 2017 10:57:59 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     snitzer@...hat.com
Cc:     kbuild test robot <lkp@...el.com>, linux-nvdimm@...ts.01.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        linux-kernel@...r.kernel.org,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        dm-devel@...hat.com, Paul Mackerras <paulus@...ba.org>,
        Alasdair Kergon <agk@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Bart Van Assche <Bart.VanAssche@....com>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>
Subject: [PATCH v3 0/2] dax, dm: stop requiring dax for device-mapper

Changes since v2 [1]:
* rebase on -next to integrate with commit 273752c9ff03 "dm, dax: Make
  sure dm_dax_flush() is called if device supports it" (kbuild robot)
* fix CONFIG_DAX dependencies to upgrade CONFIG_DAX=m to CONFIG_DAX=y
  (kbuild robot)

[1]: https://www.spinics.net/lists/kernel/msg2570522.html

---

Bart points out that the DAX core is unconditionally enabled if
device-mapper is enabled. Add some config machinery and some
stub-static-inline routines to allow dax infrastructure to be deleted
from device-mapper at compile time.

Since this depends on commit 273752c9ff03 that's already in -next, this
should go through the device-mapper tree.
---

Dan Williams (2):
      dax: introduce CONFIG_DAX_DRIVER
      dm: allow device-mapper to operate without dax support


 arch/powerpc/platforms/Kconfig |    1 +
 drivers/block/Kconfig          |    1 +
 drivers/dax/Kconfig            |    4 +++-
 drivers/md/Kconfig             |    2 +-
 drivers/md/dm-linear.c         |    6 ++++++
 drivers/md/dm-stripe.c         |    6 ++++++
 drivers/md/dm.c                |   10 ++++++----
 drivers/nvdimm/Kconfig         |    1 +
 drivers/s390/block/Kconfig     |    1 +
 include/linux/dax.h            |   30 ++++++++++++++++++++++++------
 10 files changed, 50 insertions(+), 12 deletions(-)