[v2,00/14] Fast kernel headers: split linux/mm.h

Message

Max Kellermann Feb. 22, 2024, 11:50 a.m. UTC

This patch set aims to clean up the linux/mm.h header and reduce
dependencies on it by moving parts out.

The goal was to eliminate dependencies on linux/mm.h from other
popular headers such as highmem.h and dma-mapping.h, and I started by
checking which symbols were really used and moved those declarations
to separate slim headers.

---
v1 -> v2: added more explanations to commit messages; renamed several
  new headers from page_*.h to folio_*.h as suggested by Matthew
  Wilcox; rebase on linux-next; fix build failures on architectures
  um,nios2,hexagon by adding more missing includes

Max Kellermann (14):
  drivers: add missing includes on linux/mm.h (and others)
  include/drm/drm_gem.h: add poll_table_struct forward declaration
  linux/mm.h: move page_kasan_tag() to mm/page_kasan_tag.h
  linux/mm.h: move section functions to mm/page_section.h
  linux/mm.h: move page_address() and others to mm/page_address.h
  linux/mm.h: move folio_size(), ... to mm/folio_size.h
  linux/mm.h: move folio_next() to mm/folio_next.h
  linux/mm.h: move devmap-related declarations to mm/devmap_managed.h
  linux/mm.h: move usage count functions to mm/folio_usage.h
  linux/mm.h: move page_zone_id() and more to mm/folio_zone.h
  linux/mm.h: move pfmemalloc-related functions to pfmemalloc.h
  linux/mm.h: move is_vmalloc_addr() to mm/vmalloc_addr.h
  linux/mm.h: move high_memory to mm/high_memory.h
  include: reduce dependencies on linux/mm.h

 MAINTAINERS                                   |   1 +
 arch/arm/include/asm/memory.h                 |   4 +
 arch/arm/include/asm/pgtable.h                |   2 +
 arch/arm/mm/iomap.c                           |   3 +
 arch/csky/include/asm/page.h                  |   1 +
 arch/hexagon/include/asm/mem-layout.h         |   4 +
 arch/m68k/include/asm/page_mm.h               |   1 +
 arch/m68k/include/asm/pgtable_mm.h            |   1 +
 arch/parisc/include/asm/floppy.h              |   1 +
 arch/powerpc/include/asm/book3s/32/pgtable.h  |   4 +
 arch/powerpc/include/asm/nohash/32/pgtable.h  |   1 +
 arch/powerpc/include/asm/page.h               |   1 +
 arch/x86/include/asm/floppy.h                 |   1 +
 arch/x86/include/asm/pgtable_32_areas.h       |   4 +
 drivers/comedi/comedi_buf.c                   |   1 +
 .../qat/qat_common/adf_gen4_pm_debugfs.c      |   1 +
 drivers/dma/dma-axi-dmac.c                    |   1 +
 drivers/dma/sh/rcar-dmac.c                    |   1 +
 drivers/firmware/qcom/qcom_scm-legacy.c       |   1 +
 drivers/firmware/qcom/qcom_scm-smc.c          |   1 +
 drivers/firmware/raspberrypi.c                |   1 +
 drivers/iio/buffer/industrialio-buffer-dma.c  |   1 +
 drivers/iommu/iommufd/ioas.c                  |   2 +
 drivers/iommu/iommufd/selftest.c              |   1 +
 drivers/media/platform/mediatek/vpu/mtk_vpu.c |   1 +
 drivers/media/platform/ti/omap/omap_voutlib.c |   1 +
 drivers/misc/bcm-vk/bcm_vk_dev.c              |   1 +
 drivers/misc/fastrpc.c                        |   1 +
 drivers/misc/genwqe/card_dev.c                |   1 +
 drivers/misc/uacce/uacce.c                    |   1 +
 drivers/mtd/nand/onenand/onenand_samsung.c    |   1 +
 drivers/mtd/spi-nor/core.h                    |   2 +
 drivers/pci/p2pdma.c                          |   1 +
 drivers/pci/pci.c                             |   1 +
 drivers/remoteproc/remoteproc_core.c          |   1 +
 drivers/soc/qcom/rmtfs_mem.c                  |   1 +
 drivers/spi/spi-aspeed-smc.c                  |   1 +
 drivers/spi/spi-bcm2835.c                     |   2 +
 drivers/spi/spi-intel.c                       |   1 +
 drivers/virtio/virtio_ring.c                  |   1 +
 include/drm/drm_file.h                        |   1 +
 include/linux/bio.h                           |   2 +
 include/linux/dma-mapping.h                   |   1 +
 include/linux/highmem-internal.h              |   2 +
 include/linux/highmem.h                       |   4 +-
 include/linux/huge_mm.h                       |   2 +
 include/linux/iommu.h                         |   1 +
 include/linux/mm.h                            | 582 +-----------------
 include/linux/mm/devmap_managed.h             |  37 ++
 include/linux/mm/folio_next.h                 |  27 +
 include/linux/mm/folio_size.h                 | 150 +++++
 include/linux/mm/folio_usage.h                | 177 ++++++
 include/linux/mm/folio_zone.h                 |  38 ++
 include/linux/mm/high_memory.h                |   7 +
 include/linux/mm/page_address.h               |  71 +++
 include/linux/mm/page_kasan_tag.h             |  66 ++
 include/linux/mm/page_section.h               |  23 +
 include/linux/mm/pfmemalloc.h                 |  52 ++
 include/linux/mm/vmalloc_addr.h               |  33 +
 include/linux/nvme-keyring.h                  |   2 +
 include/linux/scatterlist.h                   |   8 +-
 include/linux/skbuff.h                        |   4 +
 kernel/dma/ops_helpers.c                      |   1 +
 kernel/dma/remap.c                            |   1 +
 lib/scatterlist.c                             |   1 +
 mm/dmapool.c                                  |   1 +
 66 files changed, 777 insertions(+), 575 deletions(-)
 create mode 100644 include/linux/mm/devmap_managed.h
 create mode 100644 include/linux/mm/folio_next.h
 create mode 100644 include/linux/mm/folio_size.h
 create mode 100644 include/linux/mm/folio_usage.h
 create mode 100644 include/linux/mm/folio_zone.h
 create mode 100644 include/linux/mm/high_memory.h
 create mode 100644 include/linux/mm/page_address.h
 create mode 100644 include/linux/mm/page_kasan_tag.h
 create mode 100644 include/linux/mm/page_section.h
 create mode 100644 include/linux/mm/pfmemalloc.h
 create mode 100644 include/linux/mm/vmalloc_addr.h