[dm-devel] [PATCH v5 1/2] dax: introduce CONFIG_DAX_DRIVER
Michael Ellerman
mpe at ellerman.id.au
Fri Sep 29 06:11:51 UTC 2017
Dan Williams <dan.j.williams at intel.com> 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 <paulus at samba.org>
> Cc: Michael Ellerman <mpe at ellerman.id.au>
> Cc: Martin Schwidefsky <schwidefsky at de.ibm.com>
> Cc: Heiko Carstens <heiko.carstens at de.ibm.com>
> Cc: Gerald Schaefer <gerald.schaefer at de.ibm.com>
> Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> Cc: Mike Snitzer <snitzer at redhat.com>
> Cc: Bart Van Assche <Bart.VanAssche at wdc.com>
> Signed-off-by: Dan Williams <dan.j.williams at intel.com>
> ---
> 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?
With the driver selecting both there's no need for the core to select
DAX, because all the DAX drivers have done it already.
cheers
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