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dax: introduce CONFIG_DAX_DRIVER

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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 <[email protected]>
Cc: Heiko Carstens <[email protected]>
Reported-by: Bart Van Assche <[email protected]>
Reviewed-by: Mike Snitzer <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Dan Williams 2018-03-29 17:20:39 -07:00
commit 2080e88aec
3 changed files with 6 additions and 3 deletions
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2
drivers/nvdimm/Kconfig
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@ -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
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