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authorDan Williams <dan.j.williams@intel.com>2017-07-16 23:51:53 +0300
committerDan Williams <dan.j.williams@intel.com>2019-01-07 08:41:57 +0300
commit730926c3b0998943654019f00296cf8e3b02277e (patch)
tree9bdff0b62f4a020427144de5b703048bfb1f7c16 /drivers/dax/Kconfig
parentd200781ef237a354d918ceff5cee350d88a93d42 (diff)
downloadlinux-730926c3b0998943654019f00296cf8e3b02277e.tar.xz
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/Kconfig12
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