Once my series[1] and Dan's cleanup[2] is merged all users of DAX will require a ZONE_DEVICE page which is properly refcounted. This means there is no longer any need for the PFN_DEV and PFN_MAP flags. Furthermore the PFN_SG_CHAIN and PFN_SG_LAST flags never appear to have been used. It is therefore possible to remove the pfn_t type and replace any usage with raw pfns. The remaining users of PFN_DEV have simply passed this to vmf_insert_mixed(), however once my series is merged vmf_insert_mixed() doesn't need these flags anyway so those users can be trivially converted to using raw pfns. Note that this RFC has only been lightly build tested. Also the third patch probably needs further splitting up. I have pushed a tree with this, along with the prerequisite series, to https://github.com/apopple/linux/tree/pfn_t_cleanup [1] - https://lore.kernel.org/linux-mm/cover.425da7c4e76c2749d0ad1734f972b06114e02d52.1736221254.git-series.apopple@xxxxxxxxxx/ [2] - https://lore.kernel.org/linux-mm/172721874675.497781.3277495908107141898.stgit@xxxxxxxxxxxxxxxxxxxxxxxxx/ --- Cc: gerald.schaefer@xxxxxxxxxxxxx Cc: dan.j.williams@xxxxxxxxx Cc: jgg@xxxxxxxx Cc: willy@xxxxxxxxxxxxx Cc: david@xxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx Cc: nvdimm@xxxxxxxxxxxxxxx Cc: linux-fsdevel@xxxxxxxxxxxxxxx Cc: linux-mm@xxxxxxxxx Cc: linux-ext4@xxxxxxxxxxxxxxx Cc: linux-xfs@xxxxxxxxxxxxxxx Cc: jhubbard@xxxxxxxxxx Cc: hch@xxxxxx Alistair Popple (4): mm: Remove PFN_MAP, PFN_SG_CHAIN and PFN_SG_LAST mm: Remove uses of PFN_DEV mm: Remove callers of pfn_t functionality mm: Remove include/linux/pfn_t.h arch/x86/mm/pat/memtype.c | 6 +- drivers/dax/device.c | 23 ++---- drivers/dax/hmem/hmem.c | 1 +- drivers/dax/kmem.c | 1 +- drivers/dax/pmem.c | 1 +- drivers/dax/super.c | 3 +- drivers/gpu/drm/exynos/exynos_drm_gem.c | 1 +- drivers/gpu/drm/gma500/fbdev.c | 3 +- drivers/gpu/drm/i915/gem/i915_gem_mman.c | 1 +- drivers/gpu/drm/msm/msm_gem.c | 1 +- drivers/gpu/drm/omapdrm/omap_gem.c | 7 +-- drivers/gpu/drm/v3d/v3d_bo.c | 1 +- drivers/md/dm-linear.c | 2 +- drivers/md/dm-log-writes.c | 2 +- drivers/md/dm-stripe.c | 2 +- drivers/md/dm-target.c | 2 +- drivers/md/dm-writecache.c | 9 +-- drivers/md/dm.c | 2 +- drivers/nvdimm/pmem.c | 8 +-- drivers/nvdimm/pmem.h | 4 +- drivers/s390/block/dcssblk.c | 10 +-- drivers/vfio/pci/vfio_pci_core.c | 7 +-- fs/cramfs/inode.c | 4 +- fs/dax.c | 45 +++++------- fs/ext4/file.c | 2 +- fs/fuse/dax.c | 3 +- fs/fuse/virtio_fs.c | 5 +- fs/xfs/xfs_file.c | 2 +- include/linux/dax.h | 8 +- include/linux/device-mapper.h | 2 +- include/linux/huge_mm.h | 4 +- include/linux/mm.h | 4 +- include/linux/pfn.h | 10 +--- include/linux/pfn_t.h | 96 +------------------------- include/linux/pgtable.h | 4 +- include/trace/events/fs_dax.h | 6 +-- mm/debug_vm_pgtable.c | 1 +- mm/huge_memory.c | 23 +++--- mm/memory.c | 32 +++----- mm/memremap.c | 1 +- mm/migrate.c | 1 +- tools/testing/nvdimm/pmem-dax.c | 6 +- tools/testing/nvdimm/test/iomap.c | 11 +--- 43 files changed, 108 insertions(+), 259 deletions(-) delete mode 100644 include/linux/pfn_t.h base-commit: 47dc3422e9f51a38e4d5490937f798f080015756 -- git-series 0.9.1
