On Thu, Sep 28, 2017 at 11:11 PM, Michael Ellerman <[email protected]> wrote: > Dan Williams <[email protected]> writes: > >> 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: Paul Mackerras <[email protected]> >> Cc: Michael Ellerman <[email protected]> >> Cc: Martin Schwidefsky <[email protected]> >> Cc: Heiko Carstens <[email protected]> >> Cc: Gerald Schaefer <[email protected]> >> Cc: Benjamin Herrenschmidt <[email protected]> >> Cc: Mike Snitzer <[email protected]> >> Cc: Bart Van Assche <[email protected]> >> Signed-off-by: Dan Williams <[email protected]> >> --- >> arch/powerpc/platforms/Kconfig | 1 + >> drivers/block/Kconfig | 1 + >> drivers/dax/Kconfig | 4 +++- >> drivers/nvdimm/Kconfig | 1 + >> drivers/s390/block/Kconfig | 1 + >> 5 files changed, 7 insertions(+), 1 deletion(-) >> >> diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig >> index 4fd64d3f5c44..4561340c1f92 100644 >> --- a/arch/powerpc/platforms/Kconfig >> +++ b/arch/powerpc/platforms/Kconfig >> @@ -296,6 +296,7 @@ config AXON_RAM >> tristate "Axon DDR2 memory device driver" >> depends on PPC_IBM_CELL_BLADE && BLOCK >> select DAX >> + select DAX_DRIVER > > > I would have thought you'd want to replace the select of DAX with > a select of DAX_DRIVER?
Me too ;-) > With the driver selecting both there's no need for the core to select > DAX, because all the DAX drivers have done it already. Thanks, yes, I'll fix that up.
