Christophe Leroy 7a94b88cb7 gpio: sysfs: don't use sprintf() for 'value' attribute ...

A bench with 'perf record' shows that most of time spent in value_show()
is spent in sprintf()

--42.41%--sysfs_kf_read
          |
          |--39.73%--dev_attr_show
          |          |
          |          |--38.23%--value_show
          |          |          |
          |          |          |--29.22%--sprintf
          |          |          |
          |          |          |--2.94%--gpiod_get_value_cansleep
          |          |          |

value_show() only returns "0\n" or "1\n", therefore the use of
sprintf() can be avoided

With this patch we get the following result with 'perf record'

--13.89%--sysfs_kf_read
          |
          |--10.72%--dev_attr_show
          |          |
          |          |--9.44%--value_show
          |          |          |
          |          |          |--4.61%--gpiod_get_value_cansleep

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

2017-12-20 10:34:01 +01:00

..

devres.c

gpio: devres: Improve kerneldoc

2017-08-14 15:01:13 +02:00

gpio-74x164.c

gpio: 74x164: Introduce 'enable-gpios' property

2017-08-14 16:24:02 +02:00

gpio-74xx-mmio.c

gpio: 74xx-mmio: Use devm_gpiochip_add_data() for gpio registration

2016-02-23 20:19:42 +05:30

gpio-104-dio-48e.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-104-idi-48.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-104-idio-16.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-adnp.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-adp5520.c

gpio: adp5520: Use devm_gpiochip_add_data() for gpio registration

2016-02-23 20:34:06 +05:30

gpio-adp5588.c

gpio: adp5588: move header file out of I2C realm

2017-05-29 13:36:45 +02:00

gpio-altera-a10sr.c

gpio: altera-a10sr: constify gpio_chip structure

2017-08-14 15:01:12 +02:00

gpio-altera.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-amd8111.c

gpio: amd8111: Use devm_request_region

2016-02-16 00:19:52 +01:00

gpio-amdpt.c

gpio: amdpt: Add a new ACPI HID

2016-03-30 10:38:51 +02:00

gpio-arizona.c

gpio: arizona: Add support for GPIOs that need to be maintained

2017-05-29 11:09:01 +02:00

gpio-aspeed.c

gpio: aspeed: Add support for reset tolerance

2017-12-02 22:42:34 +01:00

gpio-ath79.c

gpio: ath79: add missing MODULE_DESCRIPTION/LICENSE

2017-12-02 22:42:22 +01:00

gpio-bcm-kona.c

gpio: bcm-kona: make use of raw_spinlock variants

2017-03-16 21:52:07 +01:00

gpio-bd9571mwv.c

gpio: Add ROHM BD9571MWV-M PMIC GPIO driver

2017-04-28 09:47:46 +02:00

gpio-brcmstb.c

gpio: brcmstb: implement suspend/resume/shutdown

2017-10-31 10:51:40 +01:00

gpio-bt8xx.c

gpio: bt8xx: use gpiochip data pointer

2016-01-05 11:21:03 +01:00

gpio-clps711x.c

gpio: clps711x: Remove board support

2016-06-08 10:49:58 +02:00

gpio-crystalcove.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-cs5535.c

gpio: cs5535: Use devm_gpiochip_add_data() for gpio registration

2016-02-23 20:35:28 +05:30

gpio-da9052.c

gpio: constify gpio_chip structures

2016-09-13 10:35:56 +02:00

gpio-da9055.c

gpio: constify gpio_chip structures

2016-09-13 10:35:56 +02:00

gpio-davinci.c

gpio: davinci: Handle the return value of davinci_gpio_irq_setup function

2017-08-14 15:03:39 +02:00

gpio-dln2.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-dwapb.c

gpio: dwapb: fix bgpio usage

2017-10-25 11:25:10 +02:00

gpio-em.c

pinctrl/gpio: Unify namespace for cross-calls

2017-09-22 11:02:10 +02:00

gpio-ep93xx.c

pinctrl / gpio: Introduce .set_config() callback for GPIO chips

2017-01-26 15:27:37 +01:00

gpio-etraxfs.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

gpio-exar.c

gpio: exar: Use correct property prefix and document bindings

2017-08-01 13:43:55 +02:00

gpio-f7188x.c

gpio: f7188x: Add a missing break

2017-04-28 10:09:16 +02:00

gpio-ftgpio010.c

gpio: ftgpio010: Fix platform_get_irq's error checking

2017-12-02 22:42:35 +01:00

gpio-ge.c

gpio: Convert to using %pOF instead of full_name

2017-08-14 15:01:12 +02:00

gpio-gpio-mm.c

Annotate hardware config module parameters in drivers/gpio/

2017-04-20 12:02:32 +01:00

gpio-grgpio.c

gpio: grgpio: Do not use gc->pin2mask()

2017-10-25 11:25:38 +02:00

gpio-htc-egpio.c

gpio: htc-egpio: read output value from cache

2016-11-13 11:50:22 +01:00

gpio-ich.c

gpio: ich: Use devm_request_region

2016-02-16 00:19:53 +01:00

gpio-ingenic.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-intel-mid.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-iop.c

gpio: iop: add missing MODULE_DESCRIPTION/AUTHOR/LICENSE

2017-12-02 22:42:21 +01:00

gpio-it87.c

gpio: it87: fix mojibake in module metadata

2017-12-02 22:42:32 +01:00

gpio-janz-ttl.c

gpio: janz-ttl: Use devm_gpiochip_add_data() for gpio registration

2016-02-23 20:35:33 +05:30

gpio-kempld.c

gpio: kempld: Use devm_gpiochip_add_data() for gpio registration

2016-02-23 20:35:34 +05:30

gpio-ks8695.c

gpio: ks8695: remove irq_to_gpio function

2016-02-19 00:20:30 +01:00

gpio-loongson1.c

gpio: loongson1: fix bgpio usage

2017-10-25 11:25:38 +02:00

gpio-loongson.c

gpio: convert remaining users to gpiochip_add_data()

2016-01-05 11:21:20 +01:00

gpio-lp873x.c

pinctrl / gpio: Introduce .set_config() callback for GPIO chips

2017-01-26 15:27:37 +01:00

gpio-lp3943.c

Revert "gpio: lp3943: Drop pin_used and lp3943_gpio_request/lp3943_gpio_free"

2016-03-09 22:00:27 +07:00

gpio-lp87565.c

gpio: lp87565: Set proper output level and direction for direction_output

2017-07-31 15:26:57 +02:00

gpio-lpc18xx.c

gpio: constify gpio_chip structures

2016-09-13 10:35:56 +02:00

gpio-lpc32xx.c

gpio: lpc32xx: remove unused platform data file

2016-09-12 14:23:37 +02:00

gpio-lynxpoint.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-max730x.c

gpio: max730x: set gpiochip data pointer before using it

2016-08-10 15:40:44 +02:00

gpio-max732x.c

gpio: max732x: Remove duplicate NULL check

2017-11-29 13:25:23 +01:00

gpio-max3191x.c

gpio: Add driver for Maxim MAX3191x industrial serializer

2017-10-19 22:40:07 +02:00

gpio-max7300.c

gpio: Drop owner assignment from i2c_driver

2015-11-30 09:31:00 +01:00

gpio-max7301.c

spi: Drop owner assignment from spi_drivers

2015-10-28 10:30:17 +09:00

gpio-max77620.c

gpio: max77620: Make regmap_irq_chip const

2017-08-14 16:06:24 +02:00

gpio-mb86s7x.c

gpio: mb86s70: Revert "Return error if requesting an already assigned gpio"

2017-10-31 13:13:34 +01:00

gpio-mc9s08dz60.c

gpio: mc9s08dz60: make explicitly non-modular

2016-03-31 15:02:09 +02:00

gpio-mc33880.c

gpio: mc33880: use gpiochip data pointer

2016-01-05 11:21:07 +01:00

gpio-menz127.c

pinctrl / gpio: Introduce .set_config() callback for GPIO chips

2017-01-26 15:27:37 +01:00

gpio-merrifield.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-ml-ioh.c

gpio: ml-ioh: use devres for irq generic chip

2017-08-21 00:06:35 +02:00

gpio-mm-lantiq.c

gpio: update my email address

2016-12-30 09:18:10 +01:00

gpio-mmio.c

gpio-mmio: Use the new .get_multiple() callback

2017-10-30 08:35:32 +01:00

gpio-mockup.c

gpio: mockup: fix a return value check

2017-12-08 15:34:15 +01:00

gpio-mpc8xxx.c

gpio: mpc8xxx: Do not reverse bits using bgpio

2017-10-25 11:25:40 +02:00

gpio-mpc5200.c

gpio: Include linux/gpio.h instead of asm/gpio.h

2016-02-16 00:20:03 +01:00

gpio-msic.c

gpio: msic: fix error return code in platform_msic_gpio_probe()

2017-08-14 15:03:38 +02:00

gpio-mvebu.c

gpio: mvebu: Fix cause computation in irq handler

2017-08-14 15:00:43 +02:00

gpio-mxc.c

gpio: mxc: use devres for irq generic chip

2017-08-21 00:09:33 +02:00

gpio-mxs.c

gpio: mxs: use devres for irq generic chip

2017-08-21 00:10:00 +02:00

gpio-octeon.c

gpio: octeon: Constify octeon_gpio_match table

2016-03-30 10:38:51 +02:00

gpio-omap.c

gpio: omap: initialize gpioirq chip as part of gpiochip_add_data

2017-11-30 10:54:16 +01:00

gpio-palmas.c

gpio: palmas: fix implicit assumption module.h is present

2016-09-15 13:57:43 +02:00

gpio-pca953x.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-pcf857x.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-pch.c

gpio: pch: use devres for irq generic chip

2017-08-21 00:08:52 +02:00

gpio-pci-idio-16.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-pisosr.c

gpio: constify gpio_chip structures

2016-09-13 10:35:56 +02:00

gpio-pl061.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-pxa.c

gpio: pxa: Use library functions

2017-10-07 00:01:08 +02:00

gpio-rc5t583.c

gpio: rc5t583: make explicitly non-modular

2016-04-05 17:02:35 +02:00

gpio-rcar.c

Merge branch 'gpio-irqchip-rework' of /home/linus/linux-gpio into devel

2017-11-09 09:38:42 +01:00

gpio-rdc321x.c

gpio: remove redundant owner assignments of drivers

2016-06-07 09:35:16 +02:00

gpio-reg.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-sa1100.c

gpio: sa1100: implement get_direction method

2017-03-24 14:04:37 +01:00

gpio-sch311x.c

gpio: remove redundant owner assignments of drivers

2016-06-07 09:35:16 +02:00

gpio-sch.c

gpio: constify gpio_chip structures

2016-09-13 10:35:56 +02:00

gpio-sodaville.c

gpio: sodaville: use resource management for irqs

2017-03-15 11:16:36 +01:00

gpio-spear-spics.c

gpio: spear-spics: drop unused MODULE_ tags from non-modular code

2016-08-23 11:23:41 +02:00

gpio-sta2x11.c

gpio: sta2x11: use devres for irq generic chip

2017-08-21 00:06:04 +02:00

gpio-stmpe.c

gpio: gpio-stmpe: make various char arrays static const, shrinks object size

2017-12-02 22:42:33 +01:00

gpio-stp-xway.c

gpio: update my email address

2016-12-30 09:18:10 +01:00

gpio-syscon.c

gpio: syscon: Change the compatibility string

2016-06-08 10:48:17 +02:00

gpio-tb10x.c

gpio: tb10x: Handle return value of devm_kasprintf

2017-09-21 14:14:17 +02:00

gpio-tc3589x.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-tegra186.c

gpio: tegra186: Remove tegra186_gpio_lock_class

2017-11-13 11:43:10 +01:00

gpio-tegra.c

pinctrl/gpio: Unify namespace for cross-calls

2017-09-22 11:02:10 +02:00

gpio-thunderx.c

gpio: thunderx: remove unused .map() hook from irq_domain_ops

2017-09-22 15:31:55 +02:00

gpio-timberdale.c

gpio: timberdale: make it explicitly non-modular

2016-05-11 13:49:11 +02:00

gpio-tpic2810.c

gpio: constify gpio_chip structures

2016-09-13 10:35:56 +02:00

gpio-tps6586x.c

gpio: remove redundant owner assignments of drivers

2016-06-07 09:35:16 +02:00

gpio-tps65086.c

gpio: constify gpio_chip structures

2016-09-13 10:35:56 +02:00

gpio-tps65218.c

pinctrl / gpio: Introduce .set_config() callback for GPIO chips

2017-01-26 15:27:37 +01:00

gpio-tps65910.c

gpio: remove redundant owner assignments of drivers

2016-06-07 09:35:16 +02:00

gpio-tps65912.c

gpio: constify gpio_chip structures

2016-09-13 10:35:56 +02:00

gpio-tps68470.c

gpio: Add support for TPS68470 GPIOs

2017-08-14 15:37:38 +02:00

gpio-ts4800.c

gpio: ts4800: Fix module autoload

2016-10-21 14:55:07 +02:00

gpio-ts4900.c

gpio: constify gpio_chip structures

2016-09-13 10:35:56 +02:00

gpio-ts5500.c

gpio: ts5500: Use devm_gpiochip_add_data() for gpio registration

2016-02-23 20:35:49 +05:30

gpio-twl4030.c

mfd: twl: Move header file out of I2C realm

2017-09-04 14:41:02 +01:00

gpio-twl6040.c

gpio: twl6040: remove unneeded forward declaration

2017-08-23 10:20:16 +02:00

gpio-tz1090-pdc.c

gpio: tz1090-pdc: use gpiochip data pointer

2016-01-05 11:21:16 +01:00

gpio-tz1090.c

pinctrl/gpio: Unify namespace for cross-calls

2017-09-22 11:02:10 +02:00

gpio-ucb1400.c

gpio: ucb1400: Use devm_gpiochip_add_data() for gpio registration

2016-02-23 20:35:50 +05:30

gpio-uniphier.c

This is the bulk of GPIO changes for the v4.15 kernel cycle:

2017-11-14 17:23:44 -08:00

gpio-vf610.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-viperboard.c

gpio: remove redundant owner assignments of drivers

2016-06-07 09:35:16 +02:00

gpio-vr41xx.c

gpio: convert remaining users to gpiochip_add_data()

2016-01-05 11:21:20 +01:00

gpio-vx855.c

pinctrl / gpio: Introduce .set_config() callback for GPIO chips

2017-01-26 15:27:37 +01:00

gpio-wcove.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-wm831x.c

gpio: wm831x: Add basic device tree support

2017-03-23 11:45:55 +00:00

gpio-wm8350.c

gpio: constify gpio_chip structures

2016-09-13 10:35:56 +02:00

gpio-wm8994.c

pinctrl / gpio: Introduce .set_config() callback for GPIO chips

2017-01-26 15:27:37 +01:00

gpio-ws16c48.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-xgene-sb.c

This is the bulk of GPIO changes for the v4.15 kernel cycle:

2017-11-14 17:23:44 -08:00

gpio-xgene.c

gpio: xgene: mark PM functions as __maybe_unused

2017-03-06 14:35:22 +01:00

gpio-xilinx.c

gpio: Convert to using %pOF instead of full_name

2017-08-14 15:01:12 +02:00

gpio-xlp.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-xra1403.c

gpio: xra1403: Add EXAR XRA1403 SPI GPIO expander driver

2017-05-22 17:48:41 +02:00

gpio-xtensa.c

gpio: convert remaining users to gpiochip_add_data()

2016-01-05 11:21:20 +01:00

gpio-zevio.c

gpio: zevio: make gpio_chip const

2017-08-23 09:21:54 +02:00

gpio-zx.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpio-zynq.c

gpio: Move irqdomain into struct gpio_irq_chip

2017-11-08 14:06:21 +01:00

gpiolib-acpi.c

gpiolib: acpi: Introduce NO_RESTRICTION quirk

2017-11-30 10:53:52 +01:00

gpiolib-devprop.c

gpio: gpiolib-devprop: Check chip->parent pointer before dereferencing

2016-10-25 20:23:19 +02:00

gpiolib-legacy.c

Revert "gpiolib: Split GPIO flags parsing and GPIO configuration"

2016-07-04 16:51:29 +02:00

gpiolib-of.c

gpio: gpiolib: Generalise state persistence beyond sleep

2017-12-02 22:42:34 +01:00

gpiolib-sysfs.c

gpio: sysfs: don't use sprintf() for 'value' attribute

2017-12-20 10:34:01 +01:00

gpiolib.c

gpiolib: use kstrdup_const() for gpio_device label

2017-12-20 09:16:39 +01:00

gpiolib.h

gpiolib: constify label in gpio_device

2017-12-20 09:01:50 +01:00

Kconfig

pinctrl: move gpio-axp209 to pinctrl

2017-12-07 10:05:30 +01:00

Makefile

pinctrl: move gpio-axp209 to pinctrl

2017-12-07 10:05:30 +01:00