Defined in 8 files as a macro:

• Documentation/ABI/obsolete/sysfs-gpio, line 16 (as a macro)
• Documentation/ABI/testing/configfs-usb-gadget-uac2, line 16 (as a macro)
• Documentation/ABI/testing/sysfs-bus-i2c-devices-lm3533, line 16 (as a macro)
• Documentation/core-api/printk-basics.rst, line 16 (as a macro)
• drivers/clk/tegra/clk-dfll.c, line 22 (as a macro)
• drivers/media/rc/keymaps/rc-apac-viewcomp.c, line 22 (as a macro)
• include/linux/ctype.h, line 25 (as a macro)
• tools/include/linux/ctype.h, line 25 (as a macro)

Defined in 1 files as a function:

• tools/include/nolibc/ctype.h, line 88 (as a function)

Referenced in 165 files:

• Documentation/devicetree/bindings/iio/proximity/semtech,sx9310.yaml, line 561
• Documentation/devicetree/bindings/interrupt-controller/brcm,bcm2836-l1-intc.txt, line 564
• Documentation/devicetree/bindings/media/allwinner,sun4i-a10-csi.yaml, line 1566
• Documentation/devicetree/bindings/media/amlogic,axg-ge2d.yaml, line 567
• Documentation/devicetree/bindings/memory-controllers/nvidia,tegra30-mc.yaml, line 1574
• Documentation/devicetree/bindings/memory-controllers/ti,da8xx-ddrctl.yaml, line 572
• Documentation/devicetree/bindings/mips/cavium/sata-uctl.txt, line 572
• Documentation/devicetree/bindings/mmc/mmc.txt, line 1576
• Documentation/devicetree/bindings/mmc/renesas,mmcif.yaml, line 573
• Documentation/devicetree/bindings/net/marvell-bt-8xxx.txt, line 1578
• Documentation/devicetree/bindings/net/mdio-mux-mmioreg.yaml, line 574
• Documentation/devicetree/bindings/phy/mediatek,hdmi-phy.yaml, line 1579
• Documentation/devicetree/bindings/phy/qcom-ipq806x-sata-phy.txt, line 1610
• Documentation/devicetree/bindings/phy/qcom-usb-ipq4019-phy.yaml, line 600
• Documentation/devicetree/bindings/pinctrl/pinctrl-st.txt, line 1610
• Documentation/devicetree/bindings/pinctrl/pinctrl-vt8500.txt, line 602
• Documentation/devicetree/bindings/pinctrl/ralink,rt305x-pinctrl.yaml, line 1616
• Documentation/devicetree/bindings/pinctrl/renesas,rzg2l-pinctrl.yaml, line 603
• Documentation/devicetree/bindings/power/supply/bq256xx.yaml, line 603
• Documentation/devicetree/bindings/powerpc/fsl/diu.txt, line 603
• Documentation/devicetree/bindings/pwm/pwm-sifive.yaml, line 1617
• Documentation/devicetree/bindings/pwm/pwm-tipwmss.txt, line 649
• Documentation/devicetree/bindings/regulator/ltc3676.txt, line 1617
• Documentation/devicetree/bindings/regulator/mp8859.txt, line 1645
• Documentation/devicetree/bindings/regulator/mt6315-regulator.yaml, line 651
• Documentation/devicetree/bindings/regulator/tps65023.txt, line 1644
• Documentation/devicetree/bindings/regulator/vqmmc-ipq4019-regulator.yaml, line 1644
• Documentation/devicetree/bindings/remoteproc/st-rproc.txt, line 651
• Documentation/devicetree/bindings/rtc/epson,rtc7301.txt, line 655
• Documentation/devicetree/bindings/rtc/isil,isl1208.txt, line 1650
• Documentation/devicetree/bindings/rtc/nxp,pcf8563.yaml, line 1650
• Documentation/devicetree/bindings/rtc/nxp,rtc-2123.txt, line 655
• Documentation/devicetree/bindings/spi/nuvoton,npcm-pspi.txt, line 1731
• Documentation/devicetree/bindings/spi/nvidia,tegra20-sflash.txt, line 223
• Documentation/devicetree/bindings/timer/snps,archs-gfrc.txt, line 223
• Documentation/devicetree/bindings/watchdog/snps,dw-wdt.yaml, line 223
• Documentation/doc-guide/index.rst, line 1782
• Documentation/driver-api/device-io.rst, line 223
• Documentation/driver-api/media/drivers/ccs/ccs.rst, line 223
• Documentation/gpu/vga-switcheroo.rst, line 223
• Documentation/hwmon/adm1275.rst, line 224
• Documentation/hwmon/lineage-pem.rst, line 224
• Documentation/misc-devices/spear-pcie-gadget.rst, line 224
• Documentation/networking/device_drivers/ethernet/marvell/octeon_ep.rst, line 224
• Documentation/power/regulator/machine.rst, line 224
• Documentation/scheduler/sched-pelt.c, line 224
• arch/arm/boot/dts/bcm4709-asus-rt-ac87u.dts, line 224
• arch/arm/boot/dts/exynos4412-prime.dtsi, line 224
• arch/arm/boot/dts/imx6sx-sdb-mqs.dts, line 224
• arch/arm/crypto/crc32-ce-glue.c, line 224
• arch/arm/mach-omap2/cm3xxx.h, line 224
• arch/arm64/boot/dts/amlogic/meson-a1.dtsi, line 224
• arch/powerpc/boot/dts/xcalibur1501.dts, line 224
• arch/powerpc/platforms/pasemi/dma_lib.c, line 224
• arch/powerpc/xmon/xmon.c, line 3511
• arch/riscv/include/asm/page.h, 3 times
• arch/s390/kernel/ipl.c, line 602
• arch/sh/boards/mach-x3proto/ilsel.c, line 224
• arch/sparc/include/asm/futex.h, line 804
• arch/sparc/include/asm/qspinlock.h, line 231
• arch/x86/tools/insn_decoder_test.c, line 809
• block/partitions/atari.c, 3 times
• crypto/algboss.c, 2 times
• drivers/acpi/osl.c, line 1388
• drivers/atm/iphase.h, line 224
• drivers/block/drbd/drbd_state.h, line 224
• drivers/char/ipmi/bt-bmc.c, line 224
• drivers/clk/imx/clk-lpcg-scu.c, line 225
• drivers/clocksource/renesas-ostm.c, line 225
• drivers/firewire/core-device.c, line 347
• drivers/firmware/google/vpd.c, line 88
• drivers/gpio/gpio-104-idi-48.c, line 226
• drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c, 3 times
• drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.h, line 226
• drivers/gpu/drm/amd/pm/swsmu/inc/pmfw_if/smu_v11_0_7_ppsmc.h, line 226
• drivers/gpu/drm/lima/lima_trace.h, line 226
• drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgk104.c, 3 times
• drivers/gpu/drm/nouveau/nvkm/subdev/bus/nv50.c, line 300
• drivers/gpu/drm/nouveau/nvkm/subdev/pci/gp100.c, line 805
• drivers/gpu/drm/radeon/si_blit_shaders.h, line 300
• drivers/iio/adc/ab8500-gpadc.c, line 300
• drivers/infiniband/hw/usnic/usnic_transport.c, line 299
• drivers/input/serio/hp_sdc.c, line 300
• drivers/input/touchscreen/lpc32xx_ts.c, line 321
• drivers/isdn/capi/capiutil.c, line 431
• drivers/media/usb/uvc/uvc_queue.c, line 321
• drivers/misc/cardreader/rtsx_usb.c, line 321
• drivers/misc/qcom-coincell.c, line 819
• drivers/net/ethernet/rocker/rocker_main.c, line 1236
• drivers/net/ethernet/seeq/ether3.h, 3 times
• drivers/net/phy/aquantia_hwmon.c, line 236
• drivers/net/phy/marvell.c, line 2768
• drivers/net/phy/marvell10g.c, line 287
• drivers/net/wireless/broadcom/brcm80211/brcmsmac/brcms_trace_events.c, line 321
• drivers/net/wireless/realtek/rtlwifi/rtl8723be/hw.h, line 321
• drivers/platform/chrome/cros_ec_lightbar.c, line 389
• drivers/platform/x86/samsung-laptop.c, line 1358
• drivers/ptp/ptp_chardev.c, 3 times
• drivers/s390/net/netiucv.c, line 1341
• drivers/scsi/aic94xx/aic94xx_sas.h, 3 times
• drivers/scsi/qedf/qedf_fip.c, 3 times
• drivers/staging/fbtft/fb_hx8357d.h, line 322
• drivers/staging/media/atomisp/TODO, 3 times
• drivers/staging/media/atomisp/pci/hive_isp_css_common/host/sp_private.h, line 322
• drivers/tty/n_tty.c, line 1008
• drivers/w1/slaves/w1_ds2405.c, line 841
• fs/btrfs/rcu-string.h, 3 times
• fs/jffs2/readinode.c, line 322
• include/dt-bindings/memory/tegra234-mc.h, line 322
• include/dt-bindings/reset/amlogic,meson8b-clkc-reset.h, line 336
• include/dt-bindings/reset/sun8i-v3s-ccu.h, line 348
• include/linux/firmware/xlnx-event-manager.h, 3 times
• include/linux/input/sh_keysc.h, line 349
• include/linux/mman.h, line 349
• include/net/netfilter/nf_conntrack_expect.h, 3 times
• include/uapi/linux/mqueue.h, line 854
• include/uapi/linux/smiapp.h, line 863
• ipc/ipc_sysctl.c, line 864
• kernel/bpf/btf.c, line 741
• kernel/bpf/syscall.c, line 910
• kernel/cfi.c, line 867
• kernel/cgroup/cgroup-v1.c, line 999
• kernel/dma/debug.c, line 737
• kernel/sched/stats.c, line 870
• kernel/trace/trace.c, line 3962
• kernel/trace/trace_events.c, 4 times
• kernel/trace/trace_events_filter.c, 2 times
• kernel/trace/trace_events_inject.c, 2 times
• lib/bootconfig.c, line 508
• lib/kobject_uevent.c, line 105
• lib/raid6/mktables.c, line 787
• lib/vsprintf.c, 5 times
• net/802/mrp.c, line 794
• net/ipv4/tcp_scalable.c, line 322
• net/netfilter/nf_conntrack_sip.c, line 91
• net/nfc/llcp_core.c, 3 times
• net/smc/smc_clc.c, 2 times
• net/smc/smc_pnet.c, line 297
• scripts/asn1_compiler.c, line 418
• scripts/basic/fixdep.c, 2 times
• scripts/kconfig/nconf.c, line 1033
• scripts/kconfig/preprocess.c, line 564
• scripts/unifdef.c, line 235
• security/apparmor/apparmorfs.c, 2 times
• sound/core/init.c, 4 times
• sound/core/jack.c, line 362
• sound/pci/hda/cs35l41_hda.c, line 149
• sound/pci/hda/hda_generic.c, line 5641
• sound/soc/codecs/rt715-sdw.h, 3 times
• sound/soc/codecs/wm_adsp.c, line 775
• sound/soc/intel/boards/hda_dsp_common.h, 3 times
• sound/soc/soc-core.c, 2 times
• tools/bpf/bpftool/gen.c, line 33
• tools/build/feature/test-cxx.cpp, 3 times
• tools/include/nolibc/ctype.h, line 96
• tools/lib/bpf/libbpf.c, 2 times
• tools/lib/traceevent/Documentation/libtraceevent-field_read.txt, 3 times
• tools/lib/traceevent/event-parse.c, 2 times
• tools/perf/builtin-trace.c, line 3842
• tools/perf/tests/attr/test-record-no-inherit, line 322
• tools/perf/util/config.c, line 142
• tools/perf/util/probe-event.c, line 213
• tools/power/cpupower/debug/kernel/Makefile, 3 times
• tools/testing/selftests/bpf/progs/test_module_attach.c, line 322
• tools/testing/selftests/drivers/usb/usbip/usbip_test.sh, line 322