On 7/12/20 9:27 AM, Dan Williams wrote:
The 'struct resource' in 'struct dev_pagemap' is only used for holding resource span information. The other fields, 'name', 'flags', 'desc', 'parent', 'sibling', and 'child' are all unused wasted space. This is in preparation for introducing a multi-range extension of devm_memremap_pages(). The bulk of this change is unwinding all the places internal to libnvdimm that used 'struct resource' unnecessarily. P2PDMA had a minor usage of the flags field, but only to report failures with "%pR". That is replaced with an open coded print of the range. Cc: Paul Mackerras <paulus@xxxxxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> Cc: Dan Williams <dan.j.williams@xxxxxxxxx> Cc: Vishal Verma <vishal.l.verma@xxxxxxxxx> Cc: Dave Jiang <dave.jiang@xxxxxxxxx> Cc: Ben Skeggs <bskeggs@xxxxxxxxxx> Cc: David Airlie <airlied@xxxxxxxx> Cc: Daniel Vetter <daniel@xxxxxxxx> Cc: Ira Weiny <ira.weiny@xxxxxxxxx> Cc: Jason Gunthorpe <jgg@xxxxxxxxxxxx> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx> --- arch/powerpc/kvm/book3s_hv_uvmem.c | 13 +++-- drivers/dax/bus.c | 10 ++-- drivers/dax/bus.h | 2 - drivers/dax/dax-private.h | 5 -- drivers/dax/device.c | 3 - drivers/dax/hmem/hmem.c | 5 ++ drivers/dax/pmem/core.c | 12 ++--- drivers/gpu/drm/nouveau/nouveau_dmem.c | 3 + drivers/nvdimm/badrange.c | 26 +++++------ drivers/nvdimm/claim.c | 13 +++-- drivers/nvdimm/nd.h | 3 + drivers/nvdimm/pfn_devs.c | 12 ++--- drivers/nvdimm/pmem.c | 26 ++++++----- drivers/nvdimm/region.c | 21 +++++---- drivers/pci/p2pdma.c | 11 ++--- include/linux/memremap.h | 5 +- include/linux/range.h | 6 ++ mm/memremap.c | 77 ++++++++++++++++---------------- tools/testing/nvdimm/test/iomap.c | 2 - 19 files changed, 135 insertions(+), 120 deletions(-)
I think you are missing a call to memremap_pages() in lib/test_hmm.c and a call to release_mem_region() that need to be converted too. Try setting CONFIG_TEST_HMM=m. Also, what about the call to release_mem_region() in drivers/gpu/drm/nouveau/nouveau_dmem.c? Doesn't that need a small change too?
