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From: Max Kellermann <max.kellermann@ionos.com>
To: linux-kernel@vger.kernel.org
Cc: Max Kellermann <max.kellermann@ionos.com>
Subject: [PATCH 00/28] Fast kernel headers: reduce header dependencies
Date: Wed, 31 Jan 2024 15:49:40 +0100
Message-Id: <20240131145008.1345531-1-max.kellermann@ionos.com>
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Fast kernel headers: reduce header dependencies
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Message
Max Kellermann
Jan. 31, 2024, 2:49 p.m. UTC
This patch set aims to reduce the dependencies between headers, in order to have cleaner code and speed up the build. It continues previous efforts by other developers. As a preparation, the first patch adds "#include" directives to source files that were missing previously, but due to indirect includes, this was never noticed. After the cleanup, many missing directives would result in a compiler failure. The second patch removes superfluous "#include" directives, some of which may be a leftover from refactoring patches. The third patch replaces existing "#include" directives with narrower ones, e.g. use "spinlock_types.h" instead of "spinlock.h". This continues the work others have done over the years. The remaining patches add new "XXX_types.h" headers with lighter dependencies. They have only basic struct/enum/const/macro definitions and maybe a few trivial inline functions, but no "extern" functions and no complex header dependencies. Just like the other attempts to reduce header dependencies in the past, this is just the beginning. There are still too many dependencies, and the speedup gained by this large patch set is not yet impressive. Prior to this patch set: real 0m34.677s user 23m13.045s sys 2m26.007s With this patch set: real 0m34.120s user 22m45.595s sys 2m21.611s (Building the directories kernel,lib,mm on ARM64 "allyesconfig".) I have tested this patch set with arm64 and amd64. Pretty sure, other architectures may fail to build, but before I test all of them, I'd like to get some feedback on wheter my approach would be accepted. For more gains, huge headers like "linux/mm.h", "linux/fs.h" and "linux/sched.h" would need to be optimized. Nearly everybody includes them, and they include nearly everything. Max Kellermann (28): include: add missing includes include: remove unnecessary #include directives include: reduce header dependencies by using "*_types.h" workqueue.h: move struct delayed_work to workqueue_types.h kref.h: move declarations to kref_types.h kobject.h: move declarations to kobject_types.h sysfs.h: move declarations to sysfs_types.h maple_tree.h: move declarations to maple_tree_types.h rwsem.h: move declarations to rwsem_types.h uprobes.h: move declarations to uprobes_types.h percpu_counter.h: move declarations to percpu_counter_types.h bvec.h: move declarations to bvec_types.h wait.h: move declarations to wait_types.h swait.h: move declarations to swait_types.h completion.h: move declarations to completion_types.h device.h: move declarations to device_types.h xarray.h: move declarations to xarray_types.h blkdev.h: move blk_op_is_passthrough() to blk_types.h bio.h: move bio_has_data() and bio_no_advance_iter() to blk_types.h bio.h: move declarations to bio_types.h percpu-refcount.h: move declarations to percpu-refcount_types.h blkdev.h: move declarations to blkdev_types.h sbitmap.h: move declarations to sbitmap_types.h list_lru.h: move declarations to list_lru_types.h list_bl.h: move declarations to list_bl_types.h percpu-rwsem.h: move declarations to percpu-rwsem_types.h quota.h: move declarations to quota_types.h radix-tree.h: move declarations to radix-tree_types.h arch/arm64/kernel/cpufeature.c | 1 + arch/arm64/kernel/cpuinfo.c | 2 + arch/arm64/kernel/ftrace.c | 1 + arch/arm64/kernel/mte.c | 2 + arch/arm64/kernel/signal.c | 1 + arch/arm64/kvm/arch_timer.c | 2 + arch/arm64/kvm/hypercalls.c | 1 + arch/arm64/kvm/vgic/vgic-mmio-v3.c | 1 + arch/arm64/kvm/vgic/vgic-mmio.c | 1 + arch/arm64/kvm/vgic/vgic-v2.c | 1 + arch/arm64/kvm/vgic/vgic-v3.c | 1 + arch/arm64/kvm/vgic/vgic-v4.c | 1 + arch/arm64/kvm/vgic/vgic.h | 1 + arch/x86/events/amd/uncore.c | 1 + arch/x86/events/intel/uncore.c | 1 + arch/x86/events/rapl.c | 1 + arch/x86/kernel/cpu/intel.c | 1 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+- include/drm/drm_atomic.h | 2 + include/drm/drm_audio_component.h | 2 +- include/drm/drm_auth.h | 3 +- include/drm/drm_bridge.h | 2 +- include/drm/drm_client.h | 2 +- include/drm/drm_color_mgmt.h | 1 + include/drm/drm_crtc.h | 2 +- include/drm/drm_debugfs.h | 2 + include/drm/drm_device.h | 4 +- include/drm/drm_file.h | 2 +- include/drm/drm_flip_work.h | 4 +- include/drm/drm_framebuffer.h | 1 + include/drm/drm_gem.h | 2 +- include/drm/drm_gem_shmem_helper.h | 1 - include/drm/drm_gpuvm.h | 2 +- include/drm/drm_managed.h | 2 +- include/drm/drm_mipi_dbi.h | 2 +- include/drm/drm_mm.h | 3 +- include/drm/drm_mode_config.h | 4 +- include/drm/drm_mode_object.h | 2 +- include/drm/drm_modeset_lock.h | 1 + include/drm/drm_panel.h | 2 +- include/drm/drm_prime.h | 4 +- include/drm/drm_print.h | 2 + include/drm/drm_privacy_screen_driver.h | 2 +- include/drm/drm_util.h | 1 - include/drm/drm_vblank.h | 2 +- include/drm/drm_vma_manager.h | 1 - include/drm/drm_writeback.h | 2 +- include/drm/gpu_scheduler.h | 7 +- include/drm/i915_hdcp_interface.h | 2 +- include/drm/i915_pxp_tee_interface.h | 2 +- include/drm/ttm/ttm_device.h | 1 - include/drm/ttm/ttm_pool.h | 2 +- include/drm/ttm/ttm_resource.h | 1 - include/keys/asymmetric-subtype.h | 1 + include/kunit/test.h | 3 +- include/kvm/arm_arch_timer.h | 2 +- include/kvm/arm_vgic.h | 6 +- include/linux/acpi.h | 4 +- include/linux/acpi_amd_wbrf.h | 7 +- include/linux/acpi_dma.h | 3 +- include/linux/agpgart.h | 2 +- include/linux/alarmtimer.h | 2 +- include/linux/async_tx.h | 1 - include/linux/atmdev.h | 2 - include/linux/backing-dev-defs.h | 20 +- include/linux/backing-dev.h | 1 + include/linux/backlight.h | 2 +- include/linux/badblocks.h | 2 +- include/linux/balloon_compaction.h | 2 +- include/linux/bcm47xx_wdt.h | 2 +- include/linux/bio.h | 97 +--- include/linux/bio_types.h | 84 +++ include/linux/blk-crypto.h | 2 +- include/linux/blk-integrity.h | 1 + include/linux/blk-mq.h | 5 +- include/linux/blk_types.h | 33 +- include/linux/blkdev.h | 468 +--------------- include/linux/blkdev_types.h | 461 ++++++++++++++++ include/linux/blktrace_api.h | 2 - include/linux/bpf-cgroup-defs.h | 4 +- include/linux/bpf-cgroup.h | 2 +- include/linux/bpf-netns.h | 1 - include/linux/bpf.h | 7 +- include/linux/bpf_mem_alloc.h | 2 +- include/linux/bsg-lib.h | 2 +- include/linux/buffer_head.h | 2 +- include/linux/bvec.h | 84 +-- include/linux/bvec_types.h | 95 ++++ include/linux/cacheinfo.h | 1 - include/linux/can/dev.h | 1 + include/linux/capability.h | 2 +- include/linux/cb710.h | 2 +- include/linux/ccp.h | 2 +- include/linux/cdev.h | 4 +- include/linux/cdrom.h | 2 +- include/linux/ceph/libceph.h | 5 +- include/linux/ceph/messenger.h | 7 +- include/linux/ceph/mon_client.h | 4 +- include/linux/ceph/osd_client.h | 8 +- include/linux/ceph/osdmap.h | 2 +- include/linux/ceph/pagelist.h | 2 +- include/linux/ceph/string_table.h | 2 +- include/linux/cgroup-defs.h | 10 +- include/linux/cgroup.h | 2 +- include/linux/clk/zynq.h | 2 +- include/linux/clocksource.h | 1 - include/linux/comedi/comedidev.h | 6 +- include/linux/completion.h | 18 +- include/linux/completion_types.h | 31 ++ include/linux/configfs.h | 4 +- include/linux/connector.h | 3 +- include/linux/console_struct.h | 4 +- include/linux/container.h | 2 +- include/linux/coresight.h | 2 +- include/linux/counter.h | 6 +- include/linux/cpu_rmap.h | 4 +- include/linux/cpufreq.h | 6 +- include/linux/cpuidle.h | 1 - include/linux/cpuset.h | 2 +- include/linux/cred.h | 2 +- include/linux/crush/crush.h | 2 +- include/linux/crypto.h | 2 +- include/linux/damon.h | 2 +- include/linux/dax.h | 1 - include/linux/dcache.h | 4 +- include/linux/dccp.h | 1 - include/linux/debugfs.h | 1 + include/linux/debugobjects.h | 1 - include/linux/dev_printk.h | 3 +- include/linux/devfreq-event.h | 2 +- include/linux/devfreq.h | 2 +- include/linux/device-mapper.h | 1 - include/linux/device.h | 475 +---------------- include/linux/device/bus.h | 4 +- include/linux/device/class.h | 4 +- include/linux/device/driver.h | 2 - include/linux/device_types.h | 500 ++++++++++++++++++ include/linux/dim.h | 2 +- include/linux/dm-bufio.h | 2 +- include/linux/dma-buf.h | 2 +- include/linux/dma-fence.h | 1 - include/linux/dma-resv.h | 1 - include/linux/dmaengine.h | 4 +- include/linux/dmi.h | 1 - include/linux/dpll.h | 1 - include/linux/dtpm.h | 2 + include/linux/edac.h | 6 +- include/linux/enclosure.h | 2 +- include/linux/energy_model.h | 4 +- include/linux/eventfd.h | 2 +- include/linux/extcon.h | 8 +- include/linux/fault-inject.h | 2 +- include/linux/fb.h | 6 +- include/linux/fdtable.h | 2 +- include/linux/filter.h | 1 - include/linux/firewire.h | 11 +- include/linux/firmware.h | 3 +- include/linux/flex_proportions.h | 9 +- include/linux/fpga/fpga-bridge.h | 2 +- include/linux/fpga/fpga-mgr.h | 2 +- include/linux/fpga/fpga-region.h | 2 +- include/linux/framer/framer-provider.h | 1 + include/linux/framer/framer.h | 6 +- include/linux/freezer.h | 1 - include/linux/fs.h | 13 +- include/linux/fs_context.h | 4 +- include/linux/fs_struct.h | 2 +- include/linux/fsl/bestcomm/bestcomm_priv.h | 2 +- include/linux/fsl/bestcomm/sram.h | 2 +- include/linux/futex.h | 1 + include/linux/gameport.h | 2 +- include/linux/gfp_api.h | 2 +- include/linux/gnss.h | 6 +- include/linux/gpio/driver.h | 2 +- include/linux/greybus/connection.h | 3 +- include/linux/greybus/operation.h | 8 +- include/linux/hdmi.h | 2 +- include/linux/hid.h | 5 +- include/linux/hisi_acc_qm.h | 1 + include/linux/hp_sdc.h | 2 +- include/linux/hrtimer.h | 7 +- include/linux/hsi/hsi.h | 2 +- include/linux/hugetlb.h | 4 +- include/linux/hw_random.h | 4 +- include/linux/hwmon-sysfs.h | 2 +- include/linux/hyperv.h | 3 +- include/linux/i2c-smbus.h | 2 - include/linux/i2c.h | 2 +- include/linux/i3c/master.h | 5 +- include/linux/i8253.h | 2 +- include/linux/idr.h | 2 +- include/linux/if_eql.h | 4 +- include/linux/if_pppox.h | 2 +- include/linux/igmp.h | 4 +- include/linux/iio/buffer-dma.h | 6 +- include/linux/iio/buffer.h | 2 +- include/linux/iio/buffer_impl.h | 5 +- include/linux/iio/iio.h | 3 +- include/linux/inetdevice.h | 2 +- include/linux/init_task.h | 2 - include/linux/input.h | 2 +- include/linux/interconnect.h | 1 - include/linux/interrupt.h | 5 +- include/linux/interval_tree.h | 3 +- include/linux/io_uring.h | 1 - include/linux/io_uring_types.h | 2 +- include/linux/iocontext.h | 4 +- include/linux/iomap.h | 2 +- include/linux/iov_iter.h | 2 +- include/linux/iova.h | 2 +- include/linux/ipc.h | 6 +- include/linux/ipc_namespace.h | 4 +- include/linux/irqdesc.h | 4 +- include/linux/irqdomain.h | 4 +- include/linux/ism.h | 2 - include/linux/jbd2.h | 4 +- include/linux/journal-head.h | 2 +- include/linux/jump_label_ratelimit.h | 2 +- include/linux/kernel_stat.h | 1 - include/linux/kernfs.h | 9 +- include/linux/key.h | 5 +- include/linux/klist.h | 4 +- include/linux/kmod.h | 2 +- include/linux/kmsan.h | 2 +- include/linux/kobj_map.h | 4 +- include/linux/kobject.h | 83 +-- include/linux/kobject_types.h | 84 +++ include/linux/kprobes.h | 4 +- include/linux/kref.h | 6 +- include/linux/kref_types.h | 12 + include/linux/kvm_host.h | 5 +- include/linux/kvm_types.h | 2 +- include/linux/lapb.h | 1 - include/linux/lcd.h | 2 +- include/linux/leds-pca9532.h | 2 +- include/linux/leds.h | 8 +- include/linux/libata.h | 2 +- include/linux/libnvdimm.h | 5 +- include/linux/libps2.h | 4 +- include/linux/list_bl.h | 19 +- include/linux/list_bl_types.h | 36 ++ include/linux/list_lru.h | 33 +- include/linux/list_lru_types.h | 42 ++ include/linux/livepatch.h | 2 +- include/linux/lockd/lockd.h | 4 +- include/linux/lockref.h | 2 +- include/linux/lp.h | 4 +- include/linux/lru_cache.h | 1 - include/linux/lsm_audit.h | 1 - include/linux/mISDNhw.h | 2 +- include/linux/mISDNif.h | 3 +- include/linux/mailbox_client.h | 2 +- include/linux/mailbox_controller.h | 6 +- include/linux/maple_tree.h | 323 +---------- include/linux/maple_tree_types.h | 341 ++++++++++++ include/linux/mbcache.h | 2 +- include/linux/mc146818rtc.h | 2 +- include/linux/mdio-mux.h | 6 +- include/linux/mdio/mdio-mscc-miim.h | 8 +- include/linux/mdio/mdio-xgene.h | 2 +- include/linux/memory-tiers.h | 4 +- include/linux/memory.h | 2 +- include/linux/memory_hotplug.h | 1 + include/linux/mempolicy.h | 5 +- include/linux/mempool.h | 2 +- include/linux/memstick.h | 2 +- include/linux/mfd/abx500/ab8500.h | 2 +- include/linux/mfd/altera-a10sr.h | 1 - include/linux/mfd/cs42l43.h | 6 +- include/linux/mfd/da9052/da9052.h | 2 +- include/linux/mfd/intel-m10-bmc.h | 2 +- include/linux/mfd/ipaq-micro.h | 2 +- include/linux/mfd/lochnagar.h | 2 +- include/linux/mfd/madera/core.h | 2 +- include/linux/mfd/max8907.h | 3 +- include/linux/mfd/mt6397/core.h | 2 +- include/linux/mfd/mt6397/rtc.h | 2 +- include/linux/mfd/pcf50633/core.h | 3 +- include/linux/mfd/rc5t583.h | 2 +- include/linux/mfd/stmpe.h | 2 +- include/linux/mfd/ucb1x00.h | 2 +- include/linux/mfd/wm831x/core.h | 1 - include/linux/mfd/wm8350/core.h | 4 +- include/linux/mfd/wm8350/supply.h | 1 - include/linux/mfd/wm8400-private.h | 1 - include/linux/mfd/wm8994/core.h | 1 - include/linux/mhi.h | 8 +- include/linux/mlx4/device.h | 4 +- include/linux/mlx5/cq.h | 1 + include/linux/mlx5/driver.h | 10 +- include/linux/mm.h | 7 +- include/linux/mm_inline.h | 4 + include/linux/mm_types.h | 20 +- include/linux/mmc/core.h | 2 +- include/linux/mmu_notifier.h | 1 - include/linux/mmzone.h | 9 +- include/linux/module.h | 3 +- include/linux/moxtet.h | 2 +- include/linux/mroute_base.h | 2 +- include/linux/msi.h | 4 +- include/linux/mtd/blktrans.h | 6 +- include/linux/mtd/doc2000.h | 2 +- include/linux/mtd/flashchip.h | 2 +- include/linux/mtd/onenand.h | 4 +- include/linux/mtd/qinfo.h | 2 - include/linux/mtd/sh_flctl.h | 2 +- include/linux/mtd/spinand.h | 2 +- include/linux/mutex.h | 2 +- include/linux/ndctl.h | 2 + include/linux/net.h | 2 +- include/linux/netdevice.h | 5 +- include/linux/netfilter.h | 1 - include/linux/netfs.h | 2 +- include/linux/netpoll.h | 2 +- include/linux/nfs4.h | 2 +- include/linux/nfs_fs.h | 7 +- include/linux/nfs_fs_sb.h | 4 +- include/linux/nfs_page.h | 3 +- include/linux/node.h | 4 +- include/linux/nodemask.h | 3 + include/linux/notifier.h | 1 + include/linux/ns_common.h | 3 +- include/linux/nsproxy.h | 1 - include/linux/ntb.h | 2 +- include/linux/objpool.h | 2 +- include/linux/oom.h | 2 +- include/linux/padata.h | 8 +- include/linux/pagemap.h | 2 +- include/linux/parport.h | 4 +- include/linux/part_stat.h | 2 +- include/linux/pci.h | 2 +- include/linux/peci.h | 2 +- include/linux/percpu-refcount.h | 66 +-- include/linux/percpu-refcount_types.h | 71 +++ include/linux/percpu-rwsem.h | 15 +- include/linux/percpu-rwsem_types.h | 24 + include/linux/percpu_counter.h | 18 +- include/linux/percpu_counter_types.h | 37 ++ include/linux/perf/arm_pmu.h | 1 - include/linux/perf_event.h | 12 +- include/linux/phy.h | 6 +- include/linux/phylink.h | 2 - include/linux/pid.h | 2 +- include/linux/pid_namespace.h | 1 - include/linux/pktcdvd.h | 5 +- include/linux/platform_data/asoc-ti-mcbsp.h | 1 - include/linux/platform_data/cros_ec_proto.h | 2 +- .../linux/platform_data/cros_ec_sensorhub.h | 2 +- include/linux/platform_data/wilco-ec.h | 2 +- include/linux/platform_data/xilinx-ll-temac.h | 2 +- include/linux/pm.h | 15 +- include/linux/pm_clock.h | 2 +- include/linux/pm_domain.h | 6 +- include/linux/pm_qos.h | 2 +- include/linux/poll.h | 2 +- include/linux/posix-clock.h | 2 +- include/linux/posix-timers.h | 3 +- include/linux/power_supply.h | 6 +- include/linux/powercap.h | 2 +- include/linux/pps_kernel.h | 3 +- include/linux/pruss_driver.h | 2 +- include/linux/psi_types.h | 5 +- include/linux/pstore.h | 4 +- include/linux/pwm.h | 1 - include/linux/qed/qede_rdma.h | 2 +- include/linux/quota.h | 40 +- include/linux/quota_types.h | 68 +++ include/linux/quotaops.h | 1 + include/linux/radix-tree.h | 45 +- include/linux/radix-tree_types.h | 50 ++ include/linux/raid/pq.h | 2 +- include/linux/raid_class.h | 2 + include/linux/random.h | 1 - include/linux/rcupdate_wait.h | 2 +- include/linux/regmap.h | 3 +- include/linux/relay.h | 5 +- include/linux/remoteproc.h | 3 +- include/linux/resctrl.h | 5 +- include/linux/reset/reset-simple.h | 2 +- include/linux/rfkill.h | 2 - include/linux/rhashtable-types.h | 2 +- include/linux/ring_buffer.h | 1 - include/linux/rpmsg.h | 4 +- include/linux/rslib.h | 2 +- include/linux/rtc.h | 4 +- include/linux/rtc/ds1685.h | 1 - include/linux/rtnetlink.h | 4 +- include/linux/rwsem.h | 48 +- include/linux/rwsem_types.h | 78 +++ include/linux/sbitmap.h | 125 +---- include/linux/sbitmap_types.h | 129 +++++ include/linux/sched/clock.h | 2 +- include/linux/sched/signal.h | 4 +- include/linux/sched/user.h | 6 +- include/linux/scs.h | 2 +- include/linux/seq_file.h | 3 +- include/linux/serial_core.h | 1 - include/linux/serio.h | 2 +- include/linux/sh_clk.h | 3 +- include/linux/shmem_fs.h | 2 +- include/linux/skbuff.h | 2 +- include/linux/slab.h | 5 +- include/linux/slimbus.h | 3 +- include/linux/soc/apple/rtkit.h | 3 +- include/linux/soc/apple/sart.h | 2 +- include/linux/soc/mediatek/mtk-cmdq.h | 1 - include/linux/soc/qcom/apr.h | 2 +- include/linux/soc/qcom/qcom_aoss.h | 2 +- include/linux/soc/qcom/qmi.h | 4 +- include/linux/socket.h | 2 +- include/linux/soundwire/sdw.h | 1 + include/linux/spi/spi.h | 2 +- include/linux/spi/spi_bitbang.h | 3 +- include/linux/srcu.h | 2 - include/linux/srcutree.h | 4 +- include/linux/ssb/ssb.h | 2 +- include/linux/ssb/ssb_driver_gige.h | 2 +- include/linux/stackdepot.h | 3 +- include/linux/stat.h | 2 +- include/linux/stm.h | 4 +- include/linux/sunrpc/auth.h | 1 - include/linux/sunrpc/auth_gss.h | 2 +- include/linux/sunrpc/clnt.h | 2 +- include/linux/sunrpc/metrics.h | 5 +- include/linux/sunrpc/rpc_pipe_fs.h | 4 +- include/linux/sunrpc/sched.h | 5 +- include/linux/sunrpc/svc.h | 1 - include/linux/sunrpc/svc_rdma.h | 1 - include/linux/sunrpc/types.h | 4 +- include/linux/sunrpc/xprt.h | 2 +- include/linux/surface_aggregator/serial_hub.h | 2 +- include/linux/swait.h | 16 +- include/linux/swait_types.h | 20 + include/linux/swap.h | 2 +- include/linux/swap_slots.h | 4 +- include/linux/swapops.h | 1 - include/linux/swiotlb.h | 7 +- include/linux/sync_file.h | 1 - include/linux/sys_soc.h | 3 +- include/linux/syscalls.h | 1 - include/linux/sysctl.h | 4 +- include/linux/sysfs.h | 70 +-- include/linux/sysfs_types.h | 89 ++++ include/linux/syslog.h | 2 +- include/linux/tee_drv.h | 2 +- include/linux/thermal.h | 6 +- include/linux/thunderbolt.h | 2 +- include/linux/tifm.h | 4 +- include/linux/torture.h | 4 - include/linux/trace_recursion.h | 1 + include/linux/tracefs.h | 1 - include/linux/transport_class.h | 3 +- include/linux/tty.h | 6 +- include/linux/tty_buffer.h | 4 +- include/linux/tty_driver.h | 1 + include/linux/tty_ldisc.h | 4 +- include/linux/tty_port.h | 2 +- include/linux/u64_stats_sync.h | 5 + include/linux/umh.h | 4 +- include/linux/uprobes.h | 12 +- include/linux/uprobes_types.h | 25 + include/linux/usb.h | 6 +- include/linux/usb/gadget.h | 2 +- include/linux/usb/hcd.h | 1 - include/linux/usb/ljca.h | 2 +- include/linux/usb/otg-fsm.h | 2 +- include/linux/usb/role.h | 5 +- include/linux/usb/serial.h | 4 +- include/linux/user_namespace.h | 5 +- include/linux/vfio.h | 2 +- include/linux/vfio_pci_core.h | 3 +- include/linux/via-core.h | 2 +- include/linux/virtio.h | 4 +- include/linux/vmalloc.h | 3 +- include/linux/vmpressure.h | 6 +- include/linux/vmw_vmci_api.h | 2 +- include/linux/vt_kern.h | 1 - include/linux/w1.h | 2 +- include/linux/wait.h | 23 +- include/linux/wait_bit.h | 5 +- include/linux/wait_types.h | 31 ++ include/linux/watch_queue.h | 2 +- include/linux/workqueue.h | 9 - include/linux/workqueue_types.h | 9 + include/linux/writeback.h | 2 +- include/linux/ww_mutex.h | 1 + include/linux/xarray.h | 56 +- include/linux/xarray_types.h | 70 +++ include/media/cec.h | 3 +- include/media/dmxdev.h | 7 +- include/media/drv-intf/saa7146.h | 2 +- include/media/dvb_demux.h | 5 +- include/media/dvb_frontend.h | 2 +- include/media/dvb_ringbuffer.h | 4 +- include/media/dvb_vb2.h | 2 +- include/media/i2c/adp1653.h | 2 +- include/media/media-device.h | 3 +- include/media/media-devnode.h | 2 +- include/media/media-request.h | 1 + include/media/rc-core.h | 3 +- include/media/v4l2-async.h | 1 - include/media/v4l2-dev.h | 2 +- include/media/v4l2-device.h | 2 + include/media/v4l2-event.h | 1 - include/media/v4l2-ioctl.h | 1 - include/media/videobuf2-core.h | 2 +- include/net/af_unix.h | 4 +- include/net/af_vsock.h | 2 +- include/net/atmclip.h | 2 +- include/net/ax25.h | 5 +- include/net/bluetooth/bluetooth.h | 3 +- include/net/bluetooth/hci_core.h | 1 + include/net/bonding.h | 1 - include/net/bpf_sk_storage.h | 4 - include/net/caif/cfcnfg.h | 1 - include/net/caif/cfsrvl.h | 1 - include/net/cfg802154.h | 2 +- include/net/devlink.h | 11 +- include/net/dsa.h | 2 - include/net/dsa_stubs.h | 1 - include/net/dst.h | 2 +- include/net/flow.h | 2 +- include/net/fq.h | 2 +- include/net/hwbm.h | 2 +- include/net/inet_connection_sock.h | 2 +- include/net/inet_frag.h | 2 +- include/net/inet_hashtables.h | 3 +- include/net/inet_timewait_sock.h | 3 +- include/net/inetpeer.h | 1 - include/net/ip6_fib.h | 2 +- include/net/ip_fib.h | 1 - include/net/ip_vs.h | 6 +- include/net/lib80211.h | 5 +- include/net/llc.h | 2 +- include/net/llc_conn.h | 2 +- include/net/neighbour.h | 5 +- include/net/net_namespace.h | 3 +- include/net/net_ratelimit.h | 2 - include/net/netdev_rx_queue.h | 4 +- include/net/netfilter/nf_conntrack_count.h | 2 +- include/net/netns/can.h | 4 +- include/net/netns/conntrack.h | 2 - include/net/netns/ipv4.h | 4 +- include/net/netns/ipv6.h | 4 + include/net/netns/mctp.h | 3 +- include/net/netns/nexthop.h | 2 +- include/net/netns/packet.h | 2 +- include/net/netns/sctp.h | 2 +- include/net/netns/smc.h | 2 +- include/net/netns/unix.h | 2 +- include/net/netns/xdp.h | 3 +- include/net/netns/xfrm.h | 3 +- include/net/netrom.h | 1 - include/net/nfc/nfc.h | 2 +- include/net/phonet/pn_dev.h | 2 +- include/net/pkt_cls.h | 3 +- include/net/sch_generic.h | 7 +- include/net/sctp/sctp.h | 2 +- include/net/sctp/structs.h | 2 +- include/net/smc.h | 6 +- include/net/snmp.h | 1 - include/net/sock.h | 6 +- include/net/sock_reuseport.h | 2 +- include/net/tcp.h | 5 +- include/net/tls.h | 2 +- include/net/tls_toe.h | 2 +- include/net/udp.h | 3 +- include/net/xdp_sock.h | 6 +- include/net/xfrm.h | 3 +- include/pcmcia/ss.h | 4 +- include/rdma/ib_sa.h | 2 +- include/rdma/ib_sysfs.h | 2 +- include/rdma/ib_umem.h | 1 - include/rdma/ib_verbs.h | 6 +- include/rdma/rdma_counter.h | 2 +- include/rdma/rdma_vt.h | 2 +- include/rdma/restrack.h | 5 +- include/rdma/uverbs_types.h | 1 + include/scsi/libfc.h | 2 +- include/scsi/libfcoe.h | 2 +- include/scsi/libiscsi.h | 8 +- include/scsi/libsas.h | 2 +- include/scsi/scsi_cmnd.h | 3 +- include/scsi/scsi_device.h | 5 +- include/scsi/scsi_host.h | 5 +- include/scsi/scsi_tcq.h | 2 +- include/scsi/scsi_transport.h | 2 +- include/scsi/scsi_transport_iscsi.h | 2 +- include/scsi/scsi_transport_sas.h | 2 +- include/scsi/scsi_transport_spi.h | 2 +- include/scsi/scsi_transport_srp.h | 2 +- include/soc/fsl/qe/qe.h | 2 +- include/sound/ac97_codec.h | 2 +- include/sound/control.h | 2 +- include/sound/core.h | 11 +- include/sound/emu10k1.h | 2 +- include/sound/rawmidi.h | 8 +- include/sound/soc.h | 2 +- include/sound/util_mem.h | 3 +- include/target/iscsi/iscsi_target_stat.h | 2 +- include/target/target_core_base.h | 4 +- include/trace/events/block.h | 2 +- include/trace/events/iommu.h | 3 +- include/trace/events/kyber.h | 2 +- include/trace/events/lock.h | 2 +- include/trace/events/mmc.h | 2 +- include/trace/events/power.h | 1 + include/trace/events/workqueue.h | 2 +- include/video/atmel_lcdc.h | 2 - include/video/omapfb_dss.h | 2 +- include/xen/interface/memory.h | 2 - include/xen/xenbus.h | 3 +- init/init_task.c | 1 + init/initramfs.c | 1 + init/main.c | 1 + io_uring/cancel.c | 1 + io_uring/io_uring.c | 2 + io_uring/timeout.h | 2 + ipc/mq_sysctl.c | 1 + ipc/mqueue.c | 1 + ipc/namespace.c | 1 + ipc/sem.c | 1 + kernel/bpf/helpers.c | 1 + kernel/cgroup/cgroup.c | 1 + kernel/cpu.c | 1 + kernel/dma/debug.c | 1 + kernel/entry/common.c | 1 + kernel/events/core.c | 1 + kernel/exit.c | 3 + kernel/fork.c | 1 + kernel/futex/core.c | 1 + kernel/futex/pi.c | 1 + kernel/futex/requeue.c | 1 + kernel/futex/syscalls.c | 1 + kernel/futex/waitwake.c | 1 + kernel/irq/irqdomain.c | 1 + kernel/irq/manage.c | 1 + kernel/kheaders.c | 1 + kernel/livepatch/core.c | 2 + kernel/livepatch/transition.c | 1 + kernel/locking/rtmutex.c | 1 + kernel/locking/rtmutex_common.h | 1 + kernel/module/main.c | 1 + kernel/module/sysfs.c | 1 + kernel/padata.c | 2 + kernel/panic.c | 2 + kernel/params.c | 1 + kernel/power/energy_model.c | 1 + kernel/reboot.c | 2 + kernel/relay.c | 1 + kernel/signal.c | 1 + kernel/smpboot.c | 1 + kernel/time/hrtimer.c | 1 + kernel/time/namespace.c | 1 + kernel/time/posix-timers.c | 1 + kernel/time/timer_list.c | 1 + kernel/trace/blktrace.c | 1 + kernel/trace/bpf_trace.c | 1 + kernel/trace/trace_osnoise.c | 1 + kernel/tsacct.c | 1 + kernel/ucount.c | 1 + kernel/user.c | 3 + kernel/watch_queue.c | 1 + kernel/watchdog.c | 1 + kernel/workqueue.c | 1 + lib/cpu_rmap.c | 2 + lib/flex_proportions.c | 3 + lib/group_cpus.c | 1 + lib/klist.c | 1 + lib/kobject.c | 4 + lib/lockref.c | 2 + lib/objpool.c | 2 + lib/test_lockup.c | 1 + mm/cma_sysfs.c | 1 + mm/damon/sysfs-common.c | 2 + mm/damon/sysfs-common.h | 2 +- mm/damon/sysfs-schemes.c | 2 + mm/damon/sysfs.c | 2 + mm/folio-compat.c | 1 + mm/huge_memory.c | 1 + mm/hugetlb.c | 1 + mm/khugepaged.c | 2 + mm/ksm.c | 2 + mm/memory-tiers.c | 2 + mm/memory.c | 1 + mm/memory_hotplug.c | 1 + mm/mempolicy.c | 2 + mm/shmem.c | 1 + mm/swap_state.c | 1 + mm/vmscan.c | 1 + mm/workingset.c | 1 + mm/z3fold.c | 1 + mm/zswap.c | 1 + net/9p/trans_virtio.c | 1 + net/bridge/br_sysfs_br.c | 1 + net/can/j1939/bus.c | 2 + net/can/j1939/main.c | 1 + net/can/j1939/transport.c | 2 + net/ceph/string_table.c | 1 + net/dsa/dsa.c | 1 + net/nfc/llcp_core.c | 1 + net/qrtr/af_qrtr.c | 1 + net/rds/message.c | 1 + net/rds/rdma.c | 1 + net/rfkill/core.c | 1 + net/sched/act_gate.c | 1 + net/tipc/node.c | 2 + net/tipc/subscr.c | 2 + net/tipc/topsrv.c | 1 + net/tls/tls_toe.c | 1 + net/wireless/reg.c | 1 + net/xfrm/xfrm_state.c | 1 + samples/vfio-mdev/mtty.c | 1 + security/integrity/ima/ima_mok.c | 1 + security/keys/proc.c | 1 + sound/core/init.c | 1 + sound/hda/hda_bus_type.c | 1 + sound/hda/hdac_sysfs.c | 1 + sound/soc/intel/avs/avs.h | 1 + sound/soc/qcom/qdsp6/q6apm.c | 1 + sound/soc/qcom/qdsp6/q6apm.h | 1 + sound/soc/sof/sof-audio.h | 1 + 1243 files changed, 4054 insertions(+), 2940 deletions(-) create mode 100644 include/linux/bio_types.h create mode 100644 include/linux/blkdev_types.h create mode 100644 include/linux/bvec_types.h create mode 100644 include/linux/completion_types.h create mode 100644 include/linux/device_types.h create mode 100644 include/linux/kobject_types.h create mode 100644 include/linux/kref_types.h create mode 100644 include/linux/list_bl_types.h create mode 100644 include/linux/list_lru_types.h create mode 100644 include/linux/maple_tree_types.h create mode 100644 include/linux/percpu-refcount_types.h create mode 100644 include/linux/percpu-rwsem_types.h create mode 100644 include/linux/percpu_counter_types.h create mode 100644 include/linux/quota_types.h create mode 100644 include/linux/radix-tree_types.h create mode 100644 include/linux/rwsem_types.h create mode 100644 include/linux/sbitmap_types.h create mode 100644 include/linux/swait_types.h create mode 100644 include/linux/sysfs_types.h create mode 100644 include/linux/uprobes_types.h create mode 100644 include/linux/wait_types.h create mode 100644 include/linux/xarray_types.h
Comments
Hi Max, On 1/31/24 06:49, Max Kellermann wrote: > This patch set aims to reduce the dependencies between headers, in > order to have cleaner code and speed up the build. It continues > previous efforts by other developers. > > As a preparation, the first patch adds "#include" directives to source > files that were missing previously, but due to indirect includes, this > was never noticed. After the cleanup, many missing directives would > result in a compiler failure. > > The second patch removes superfluous "#include" directives, some of > which may be a leftover from refactoring patches. [snip] > Max Kellermann (28): > include: add missing includes > include: remove unnecessary #include directives How were these (a) missing and (b) unnecessary includes found or determined? Did you use some tool for that? If so, which one? thanks.
On Wed, Jan 31, 2024 at 10:44 PM Randy Dunlap <rdunlap@infradead.org> wrote: > How were these (a) missing and (b) unnecessary includes > found or determined? > Did you use some tool for that? If so, which one? No tool, just stgit to edit the patches (in arbitrary order). I reduced header dependencies, but got lots of build errors because symbols were missing in different sources, which were previously fulfilled by indirect includes that were now removed. I fixed all those build errors by adding missing includes to those headers, moving those changes to the first patch. I found the unnecessary includes manually along the way by using "git grep" to find all include directives for a certain header; I checked the source for the reason why this header was included, and whether the include could be replaced with "X_types.h" instead. Sometimes, I found that not even "X_types.h" was necessary, but no include at all, so I removed the include completely and had those changes in the second patch. The first two patches grew along the way. It was refreshed over and over (with stgit), while I was editing the other patches. I know there's the "iwyu" tool, and it may be helpful eventually, but there's so much low-hanging fruit in the kernel, iwyu is not useful yet I think. Max
On Wed, Jan 31, 2024 at 11:00:27PM +0100, Max Kellermann wrote: > On Wed, Jan 31, 2024 at 10:44 PM Randy Dunlap <rdunlap@infradead.org> wrote: > > How were these (a) missing and (b) unnecessary includes > > found or determined? > > Did you use some tool for that? If so, which one? > > No tool, just stgit to edit the patches (in arbitrary order). I > reduced header dependencies, but got lots of build errors because > symbols were missing in different sources, which were previously > fulfilled by indirect includes that were now removed. I fixed all > those build errors by adding missing includes to those headers, moving > those changes to the first patch. > > I found the unnecessary includes manually along the way by using "git > grep" to find all include directives for a certain header; I checked > the source for the reason why this header was included, and whether > the include could be replaced with "X_types.h" instead. Sometimes, I > found that not even "X_types.h" was necessary, but no include at all, > so I removed the include completely and had those changes in the > second patch. > > The first two patches grew along the way. It was refreshed over and > over (with stgit), while I was editing the other patches. > > I know there's the "iwyu" tool, and it may be helpful eventually, but > there's so much low-hanging fruit in the kernel, iwyu is not useful > yet I think. We just wrapped up an internship where Tanzir was looking into getting IWYU working on the kernel. He presented about it at Linux Plumbers Conf '23 recently. https://youtu.be/eFq_oqLiXPM?si=0VhuMnwjHnMPJeaR https://youtu.be/XMVLSEzbpQ8?si=_2DQpS7JBlEC4FK1 https://github.com/ClangBuiltLinux/IWYUScripts https://lore.kernel.org/lkml/?q=f%3Atanzirh%40google.com Some of his patches have landed, others had requests from maintainers that weren't reasonable to satisfy in the short duration of an internship. But still worth pursuing. Happy to chat more about the general problem sometime. > > Max