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Subject[RFC] stop using ->read and ->write for kernel access
Date
Hi Al and Linus,

as part of removing set_fs entirely (for which I have a working
prototype), we need to stop calling ->read and ->write with kernel
pointers under set_fs.

My previous "clean up kernel_{read,write} & friends v5" series, on which
this one builds, consolidate those calls into the __ḵernel_{read,write}
helpers. This series goes further and removes the option to call
->read and ->write with kernel pointers entirely. The replacement
options are either the existing ->read_iter and ->write_iter methods
which cope with kvecs and kernel pointers just fine and are used by
many instances including all the "real" file systems. For for other
files like devices they are not suitable. Fortunately we don't really
do pure kernel reads and writes to any of those. Traditionally the only
real exception has been splice, which could be used every file for the
last few years, although initially it was optional.

So in addition to some more cleanup like moving the seq_file code to
the iter interface this series introduces a new uptr_t type for a
"universal" pointer that can point to either user or kernel memory
in a properly tagged way, and then adds new read_uptr an write_uptr
ops based on that. It then converts over the sysctl code as 5.8 added
new code that actually does a kernel_write to it. Any driver that really
wants splice to work can also be converted over to it, although I haven't
run into one yet.

A git branch is available here:

git://git.infradead.org/users/hch/misc.git uptr

Gitweb:

http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/uptr

Diffstat:
Documentation/filesystems/seq_file.rst | 2
Documentation/process/clang-format.rst | 4
Documentation/translations/it_IT/process/clang-format.rst | 4
arch/alpha/kernel/srm_env.c | 2
arch/arm/mm/alignment.c | 2
arch/arm/mm/ptdump_debugfs.c | 2
arch/arm64/kvm/vgic/vgic-debug.c | 2
arch/c6x/platforms/pll.c | 2
arch/mips/cavium-octeon/oct_ilm.c | 2
arch/mips/kernel/segment.c | 2
arch/mips/ralink/bootrom.c | 2
arch/powerpc/kernel/rtas-proc.c | 10 -
arch/powerpc/kvm/book3s_xive_native.c | 2
arch/powerpc/kvm/timing.c | 2
arch/powerpc/mm/numa.c | 2
arch/powerpc/mm/ptdump/bats.c | 2
arch/powerpc/mm/ptdump/hashpagetable.c | 2
arch/powerpc/mm/ptdump/ptdump.c | 2
arch/powerpc/mm/ptdump/segment_regs.c | 2
arch/powerpc/platforms/cell/spufs/file.c | 8 -
arch/powerpc/platforms/pseries/hvCall_inst.c | 2
arch/powerpc/platforms/pseries/lpar.c | 4
arch/powerpc/platforms/pseries/lparcfg.c | 2
arch/s390/kernel/diag.c | 2
arch/s390/mm/dump_pagetables.c | 2
arch/s390/pci/pci_debug.c | 2
arch/sh/mm/alignment.c | 2
arch/sh/mm/asids-debugfs.c | 2
arch/sh/mm/cache-debugfs.c | 2
arch/sh/mm/pmb.c | 2
arch/sh/mm/tlb-debugfs.c | 2
arch/sparc/kernel/led.c | 2
arch/um/kernel/exitcode.c | 2
arch/um/kernel/process.c | 2
arch/x86/kernel/cpu/mce/severity.c | 2
arch/x86/kernel/cpu/mtrr/if.c | 2
arch/x86/mm/pat/memtype.c | 2
arch/x86/mm/pat/set_memory.c | 2
arch/x86/platform/uv/tlb_uv.c | 2
arch/x86/xen/p2m.c | 2
block/blk-mq-debugfs.c | 2
drivers/acpi/battery.c | 2
drivers/acpi/proc.c | 2
drivers/base/power/wakeup.c | 2
drivers/block/aoe/aoeblk.c | 2
drivers/block/drbd/drbd_debugfs.c | 10 -
drivers/block/nbd.c | 4
drivers/block/pktcdvd.c | 2
drivers/block/rsxx/core.c | 4
drivers/bus/mvebu-mbus.c | 4
drivers/char/tpm/eventlog/common.c | 2
drivers/crypto/allwinner/sun8i-ce/sun8i-ce-core.c | 2
drivers/crypto/allwinner/sun8i-ss/sun8i-ss-core.c | 2
drivers/crypto/amlogic/amlogic-gxl-core.c | 2
drivers/crypto/caam/dpseci-debugfs.c | 2
drivers/crypto/cavium/zip/zip_main.c | 6
drivers/crypto/hisilicon/qm.c | 2
drivers/crypto/qat/qat_common/adf_cfg.c | 2
drivers/crypto/qat/qat_common/adf_transport_debug.c | 4
drivers/firmware/tegra/bpmp-debugfs.c | 2
drivers/gpio/gpiolib.c | 2
drivers/gpu/drm/amd/amdkfd/kfd_debugfs.c | 4
drivers/gpu/drm/arm/display/komeda/komeda_dev.c | 2
drivers/gpu/drm/arm/malidp_drv.c | 2
drivers/gpu/drm/armada/armada_debugfs.c | 2
drivers/gpu/drm/drm_debugfs.c | 6
drivers/gpu/drm/drm_debugfs_crc.c | 2
drivers/gpu/drm/drm_mipi_dbi.c | 2
drivers/gpu/drm/i915/display/intel_display_debugfs.c | 16 +-
drivers/gpu/drm/i915/gt/debugfs_gt.h | 2
drivers/gpu/drm/i915/i915_debugfs_params.c | 12 -
drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c | 2
drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 4
drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 2
drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 4
drivers/gpu/drm/msm/msm_debugfs.c | 2
drivers/gpu/drm/nouveau/nouveau_debugfs.c | 2
drivers/gpu/drm/omapdrm/dss/dss.c | 2
drivers/gpu/host1x/debug.c | 4
drivers/gpu/vga/vga_switcheroo.c | 2
drivers/hid/hid-picolcd_debugfs.c | 2
drivers/hid/hid-wiimote-debug.c | 2
drivers/hwmon/dell-smm-hwmon.c | 2
drivers/ide/ide-proc.c | 4
drivers/infiniband/hw/cxgb4/device.c | 4
drivers/infiniband/hw/qib/qib_debugfs.c | 2
drivers/infiniband/ulp/ipoib/ipoib_fs.c | 4
drivers/input/input.c | 4
drivers/macintosh/via-pmu.c | 2
drivers/md/bcache/closure.c | 2
drivers/md/md.c | 2
drivers/media/cec/core/cec-core.c | 2
drivers/media/pci/saa7164/saa7164-core.c | 2
drivers/memory/emif.c | 4
drivers/memory/tegra/tegra124-emc.c | 2
drivers/memory/tegra/tegra186-emc.c | 2
drivers/memory/tegra/tegra20-emc.c | 2
drivers/memory/tegra/tegra30-emc.c | 2
drivers/mfd/ab3100-core.c | 2
drivers/mfd/ab3100-otp.c | 2
drivers/mfd/ab8500-debugfs.c | 14 -
drivers/mfd/tps65010.c | 2
drivers/misc/habanalabs/debugfs.c | 2
drivers/misc/sgi-gru/gruprocfs.c | 6
drivers/mmc/core/mmc_test.c | 2
drivers/mtd/mtdcore.c | 4
drivers/mtd/ubi/debug.c | 2
drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c | 38 ++---
drivers/net/ethernet/chelsio/cxgb4/l2t.c | 2
drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c | 8 -
drivers/net/ethernet/freescale/dpaa2/dpaa2-eth-debugfs.c | 6
drivers/net/ethernet/intel/fm10k/fm10k_debugfs.c | 2
drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c | 2
drivers/net/wireless/ath/ath5k/debug.c | 2
drivers/net/wireless/ath/wil6210/debugfs.c | 14 -
drivers/net/wireless/broadcom/brcm80211/brcmsmac/debug.c | 2
drivers/net/wireless/intel/ipw2x00/libipw_module.c | 2
drivers/net/wireless/intel/iwlwifi/fw/debugfs.c | 2
drivers/net/wireless/intel/iwlwifi/pcie/trans.c | 2
drivers/net/wireless/intersil/hostap/hostap_download.c | 2
drivers/net/wireless/mediatek/mt76/mt7603/debugfs.c | 2
drivers/net/wireless/mediatek/mt76/mt7615/debugfs.c | 2
drivers/net/wireless/mediatek/mt76/mt76x02_debugfs.c | 4
drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c | 4
drivers/net/wireless/mediatek/mt7601u/debugfs.c | 4
drivers/net/wireless/realtek/rtlwifi/debug.c | 2
drivers/net/wireless/realtek/rtw88/debug.c | 4
drivers/net/wireless/rsi/rsi_91x_debugfs.c | 4
drivers/net/xen-netback/xenbus.c | 2
drivers/nvme/host/fabrics.c | 2
drivers/parisc/led.c | 2
drivers/pci/controller/pci-tegra.c | 2
drivers/platform/x86/asus-wmi.c | 2
drivers/platform/x86/intel_pmc_core.c | 2
drivers/platform/x86/intel_telemetry_debugfs.c | 4
drivers/platform/x86/thinkpad_acpi.c | 2
drivers/platform/x86/toshiba_acpi.c | 8 -
drivers/pnp/pnpbios/proc.c | 2
drivers/power/supply/da9030_battery.c | 2
drivers/pwm/core.c | 2
drivers/ras/cec.c | 2
drivers/ras/debugfs.c | 2
drivers/s390/block/dasd.c | 2
drivers/s390/block/dasd_proc.c | 2
drivers/s390/cio/blacklist.c | 2
drivers/s390/cio/qdio_debug.c | 2
drivers/scsi/hisi_sas/hisi_sas_main.c | 32 ++--
drivers/scsi/qedf/qedf_dbg.h | 2
drivers/scsi/qedi/qedi_dbg.h | 2
drivers/scsi/qla2xxx/qla_dfs.c | 12 -
drivers/scsi/scsi_devinfo.c | 2
drivers/scsi/scsi_proc.c | 4
drivers/scsi/sg.c | 4
drivers/scsi/snic/snic_debugfs.c | 4
drivers/sh/intc/virq-debugfs.c | 2
drivers/soc/qcom/cmd-db.c | 2
drivers/soc/qcom/socinfo.c | 4
drivers/soc/ti/knav_dma.c | 2
drivers/soc/ti/knav_qmss_queue.c | 2
drivers/staging/rtl8192u/ieee80211/ieee80211_module.c | 2
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_debugfs.c | 4
drivers/usb/chipidea/debug.c | 4
drivers/usb/dwc2/debugfs.c | 2
drivers/usb/dwc3/debugfs.c | 8 -
drivers/usb/gadget/function/rndis.c | 2
drivers/usb/gadget/udc/lpc32xx_udc.c | 2
drivers/usb/gadget/udc/renesas_usb3.c | 2
drivers/usb/host/xhci-debugfs.c | 6
drivers/usb/mtu3/mtu3_debugfs.c | 8 -
drivers/usb/musb/musb_debugfs.c | 4
drivers/video/fbdev/via/viafbdev.c | 14 -
drivers/visorbus/visorbus_main.c | 2
drivers/xen/xenfs/xensyms.c | 2
fs/cifs/cifs_debug.c | 14 -
fs/cifs/dfs_cache.c | 2
fs/debugfs/file.c | 4
fs/dlm/debug_fs.c | 8 -
fs/file_table.c | 7
fs/fscache/object-list.c | 2
fs/gfs2/glock.c | 6
fs/internal.h | 10 +
fs/jbd2/journal.c | 2
fs/jfs/jfs_debug.c | 2
fs/nfsd/nfs4state.c | 4
fs/nfsd/nfsctl.c | 12 -
fs/nfsd/stats.c | 2
fs/ocfs2/cluster/netdebug.c | 6
fs/ocfs2/dlm/dlmdebug.c | 2
fs/ocfs2/dlmglue.c | 2
fs/open.c | 8 -
fs/openpromfs/inode.c | 2
fs/orangefs/orangefs-debugfs.c | 2
fs/proc/array.c | 2
fs/proc/base.c | 24 +--
fs/proc/cpuinfo.c | 2
fs/proc/fd.c | 2
fs/proc/generic.c | 4
fs/proc/inode.c | 28 +++
fs/proc/proc_net.c | 4
fs/proc/proc_sysctl.c | 41 +++--
fs/proc/stat.c | 2
fs/proc/task_mmu.c | 8 -
fs/proc/task_nommu.c | 2
fs/proc_namespace.c | 6
fs/read_write.c | 49 ++++--
fs/seq_file.c | 34 ++--
fs/splice.c | 40 +++--
include/linux/fs.h | 10 +
include/linux/proc_fs.h | 1
include/linux/seq_file.h | 7
include/linux/uptr.h | 72 ++++++++++
ipc/util.c | 2
kernel/bpf/inode.c | 2
kernel/fail_function.c | 2
kernel/gcov/fs.c | 2
kernel/irq/debugfs.c | 2
kernel/irq/proc.c | 6
kernel/kallsyms.c | 2
kernel/kcsan/debugfs.c | 2
kernel/latencytop.c | 2
kernel/locking/lockdep_proc.c | 2
kernel/module.c | 2
kernel/profile.c | 2
kernel/sched/debug.c | 2
kernel/sched/psi.c | 6
kernel/time/test_udelay.c | 2
kernel/trace/ftrace.c | 16 +-
kernel/trace/trace.c | 20 +-
kernel/trace/trace_dynevent.c | 2
kernel/trace/trace_events.c | 10 -
kernel/trace/trace_events_hist.c | 4
kernel/trace/trace_events_synth.c | 2
kernel/trace/trace_events_trigger.c | 2
kernel/trace/trace_kprobe.c | 4
kernel/trace/trace_printk.c | 2
kernel/trace/trace_stack.c | 4
kernel/trace/trace_stat.c | 2
kernel/trace/trace_uprobe.c | 4
lib/debugobjects.c | 2
lib/dynamic_debug.c | 4
lib/error-inject.c | 2
lib/kunit/debugfs.c | 2
mm/kmemleak.c | 2
mm/slab_common.c | 2
mm/swapfile.c | 2
net/6lowpan/debugfs.c | 2
net/atm/mpoa_proc.c | 2
net/batman-adv/debugfs.c | 4
net/bluetooth/6lowpan.c | 2
net/core/pktgen.c | 6
net/hsr/hsr_debugfs.c | 2
net/ipv4/netfilter/ipt_CLUSTERIP.c | 2
net/ipv4/route.c | 4
net/l2tp/l2tp_debugfs.c | 2
net/netfilter/xt_recent.c | 2
net/sunrpc/cache.c | 4
net/sunrpc/debugfs.c | 4
net/sunrpc/rpc_pipe.c | 2
net/sunrpc/stats.c | 2
security/apparmor/apparmorfs.c | 10 -
security/integrity/ima/ima_fs.c | 6
security/selinux/selinuxfs.c | 2
security/smack/smackfs.c | 20 +-
sound/core/info.c | 2
264 files changed, 700 insertions(+), 549 deletions(-)

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