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V" , "Oliver O'Halloran" , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Frederic Barrat , Andrew Donnellan , Arnd Bergmann , Greg Kroah-Hartman , Vishal Verma , Dave Jiang , Ira Weiny , Andrew Morton , Mauro Carvalho Chehab , "David S. Miller" , Rob Herring , Anton Blanchard , Krzysztof Kozlowski , Mahesh Salgaonkar , Madhavan Srinivasan , =?UTF-8?Q?C=C3=A9dric_Le_Goater?= , Anju T Sudhakar , Hari Bathini , Thomas Gleixner , Greg Kurz , Nicholas Piggin , Masahiro Yamada , Alexey Kardashevskiy , Linux Kernel Mailing List , linuxppc-dev , linux-nvdimm , Linux MM Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sun, Mar 29, 2020 at 10:23 PM Alastair D'Silva wrote: > > This patch enables the OpenCAPI Persistent Memory driver, as well > as DAX support, for the 'powernv' defconfig. > > DAX is not a strict requirement for the functioning of the driver, but it > is likely that a user will want to create a DAX device on top of their > persistent memory device. > > Signed-off-by: Alastair D'Silva > Reviewed-by: Andrew Donnellan > --- > arch/powerpc/configs/powernv_defconfig | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/arch/powerpc/configs/powernv_defconfig b/arch/powerpc/configs/powernv_defconfig > index 71749377d164..921d77bbd3d2 100644 > --- a/arch/powerpc/configs/powernv_defconfig > +++ b/arch/powerpc/configs/powernv_defconfig > @@ -348,3 +348,8 @@ CONFIG_KVM_BOOK3S_64=m > CONFIG_KVM_BOOK3S_64_HV=m > CONFIG_VHOST_NET=m > CONFIG_PRINTK_TIME=y > +CONFIG_ZONE_DEVICE=y > +CONFIG_OCXL_PMEM=m > +CONFIG_DEV_DAX=m > +CONFIG_DEV_DAX_PMEM=m > +CONFIG_FS_DAX=y These options have dependencies. I think it would better to implement a top-level configuration question called something like PERSISTENT_MEMORY_ALL that goes and selects all the bus providers and infrastructure and lets other defaults follow along. For example, CONFIG_DEV_DAX could grow a "default LIBNVDIMM" and then CONFIG_DEV_DAX_PMEM would default on as well. If CONFIG_PERSISTENT_MEMORY_ALL selected all the bus providers and ZONE_DEVICE then the Kconfig system could prompt you to where the dependencies are not satisfied.