From 7a67832c7e44c20935c5d6f2264035a0f7bf0d8f Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 19 Aug 2015 00:34:34 -0400 Subject: libnvdimm, e820: make CONFIG_X86_PMEM_LEGACY a tristate option We currently register a platform device for e820 type-12 memory and register a nvdimm bus beneath it. Registering the platform device triggers the device-core machinery to probe for a driver, but that search currently comes up empty. Building the nvdimm-bus registration into the e820_pmem platform device registration in this way forces libnvdimm to be built-in. Instead, convert the built-in portion of CONFIG_X86_PMEM_LEGACY to simply register a platform device and move the rest of the logic to the driver for e820_pmem, for the following reasons: 1/ Letting e820_pmem support be a module allows building and testing libnvdimm.ko changes without rebooting 2/ All the normal policy around modules can be applied to e820_pmem (unbind to disable and/or blacklisting the module from loading by default) 3/ Moving the driver to a generic location and converting it to scan "iomem_resource" rather than "e820.map" means any other architecture can take advantage of this simple nvdimm resource discovery mechanism by registering a resource named "Persistent Memory (legacy)" Cc: Christoph Hellwig Signed-off-by: Dan Williams --- drivers/nvdimm/Makefile | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/nvdimm/Makefile') diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile index 594bb97c867a..9bf15db52dee 100644 --- a/drivers/nvdimm/Makefile +++ b/drivers/nvdimm/Makefile @@ -2,6 +2,7 @@ obj-$(CONFIG_LIBNVDIMM) += libnvdimm.o obj-$(CONFIG_BLK_DEV_PMEM) += nd_pmem.o obj-$(CONFIG_ND_BTT) += nd_btt.o obj-$(CONFIG_ND_BLK) += nd_blk.o +obj-$(CONFIG_X86_PMEM_LEGACY) += nd_e820.o nd_pmem-y := pmem.o @@ -9,6 +10,8 @@ nd_btt-y := btt.o nd_blk-y := blk.o +nd_e820-y := e820.o + libnvdimm-y := core.o libnvdimm-y += bus.o libnvdimm-y += dimm_devs.o -- cgit v1.2.3