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Commit 2080e88a authored by Dan Williams's avatar Dan Williams
Browse files

dax: introduce CONFIG_DAX_DRIVER 



In support of allowing device-mapper to compile out idle/dead code when
there are no dax providers in the system, introduce the DAX_DRIVER
symbol. This is selected by all leaf drivers that device-mapper might be
layered on top. This allows device-mapper to conditionally 'select DAX'
only when a provider is present.

Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Reported-by: default avatarBart Van Assche <Bart.VanAssche@wdc.com>
Reviewed-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent d2c997c0

drivers/dax/Kconfig

+4 −1
Original line number Diff line number Diff line 
config DAX_DRIVER

	select DAX

	bool



menuconfig DAX

	tristate "DAX: direct access to differentiated memory"

	select SRCU
@@ -16,7 +20,6 @@ config DEV_DAX 
	  baseline memory pool.  Mappings of a /dev/daxX.Y device impose

	  restrictions that make the mapping behavior deterministic.





config DEV_DAX_PMEM

	tristate "PMEM DAX: direct access to persistent memory"

	depends on LIBNVDIMM && NVDIMM_DAX && DEV_DAX

drivers/nvdimm/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -20,7 +20,7 @@ if LIBNVDIMM 
config BLK_DEV_PMEM

	tristate "PMEM: Persistent memory block device support"

	default LIBNVDIMM

	select DAX

	select DAX_DRIVER

	select ND_BTT if BTT

	select ND_PFN if NVDIMM_PFN

	help

drivers/s390/block/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -15,8 +15,8 @@ config BLK_DEV_XPRAM 


config DCSSBLK

	def_tristate m

	select DAX

	select FS_DAX_LIMITED

	select DAX_DRIVER

	prompt "DCSSBLK support"

	depends on S390 && BLOCK

	help