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| author | Dan Williams <dan.j.williams@intel.com> | 2017-07-16 13:51:53 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2019-01-06 21:41:57 -0800 |
| commit | 730926c3b0998943654019f00296cf8e3b02277e (patch) | |
| tree | 9bdff0b62f4a020427144de5b703048bfb1f7c16 /drivers/dax/Kconfig | |
| parent | d200781ef237a354d918ceff5cee350d88a93d42 (diff) | |
| download | linux-730926c3b0998943654019f00296cf8e3b02277e.tar.gz linux-730926c3b0998943654019f00296cf8e3b02277e.tar.bz2 linux-730926c3b0998943654019f00296cf8e3b02277e.zip | |
device-dax: Add /sys/class/dax backwards compatibility
On the expectation that some environments may not upgrade libdaxctl
(userspace component that depends on the /sys/class/dax hierarchy),
provide a default / legacy dax_pmem_compat driver. The dax_pmem_compat
driver implements the original /sys/class/dax sysfs layout rather than
/sys/bus/dax. When userspace is upgraded it can blacklist this module
and switch to the dax_pmem driver going forward.
CONFIG_DEV_DAX_PMEM_COMPAT and supporting code will be deleted according
to the dax_pmem entry in Documentation/ABI/obsolete/.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax/Kconfig')
| -rw-r--r-- | drivers/dax/Kconfig | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/dax/Kconfig b/drivers/dax/Kconfig index e0700bf4893a..6fc96f03920e 100644 --- a/drivers/dax/Kconfig +++ b/drivers/dax/Kconfig @@ -23,12 +23,22 @@ config DEV_DAX config DEV_DAX_PMEM tristate "PMEM DAX: direct access to persistent memory" depends on LIBNVDIMM && NVDIMM_DAX && DEV_DAX + depends on m # until we can kill DEV_DAX_PMEM_COMPAT default DEV_DAX help Support raw access to persistent memory. Note that this driver consumes memory ranges allocated and exported by the libnvdimm sub-system. - Say Y if unsure + Say M if unsure + +config DEV_DAX_PMEM_COMPAT + tristate "PMEM DAX: support the deprecated /sys/class/dax interface" + depends on DEV_DAX_PMEM + default DEV_DAX_PMEM + help + Older versions of the libdaxctl library expect to find all + device-dax instances under /sys/class/dax. If libdaxctl in + your distribution is older than v58 say M, otherwise say N. endif |