Revision 2bbd00aef0671bfe3c2ca5ba67097246257de125 authored by Johannes Weiner on 26 February 2021, 01:16:47 UTC, committed by Linus Torvalds on 26 February 2021, 17:41:00 UTC
On NOHZ, the periodic vmstat flushers on each CPU can go to sleep and won't wake up until stat changes are detected in the per-cpu deltas of the zone vmstat counters. In commit 75ef71840539 ("mm, vmstat: add infrastructure for per-node vmstats") per-node counters were introduced, and subsequently most stats were moved from the zone to the node level. However, the node counters weren't added to the NOHZ wakeup detection. In theory this can cause per-cpu errors to remain in the user-reported stats indefinitely. In practice this only affects a handful of sub counters (file_mapped, dirty and writeback e.g.) because other page state changes at the node level likely involve a change at the zone level as well (alloc and free, lru ops). Also, nobody has complained. Fix it up for completeness: wake up vmstat refreshing on node changes. Also remove the BUILD_BUG_ONs that assert counter size; we haven't relied on it since we added sizeof() to the range calculation in commit 13c9aaf7fa01 ("mm/vmstat.c: fix NUMA statistics updates"). Link: https://lkml.kernel.org/r/20210202184342.118513-1-hannes@cmpxchg.org Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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gpio-lp87565.c
/*
* Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
* Keerthy <j-keerthy@ti.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether expressed or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License version 2 for more details.
*
* Based on the LP873X driver
*/
#include <linux/gpio/driver.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mfd/lp87565.h>
struct lp87565_gpio {
struct gpio_chip chip;
struct regmap *map;
};
static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct lp87565_gpio *gpio = gpiochip_get_data(chip);
int ret, val;
ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
if (ret < 0)
return ret;
return !!(val & BIT(offset));
}
static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
int value)
{
struct lp87565_gpio *gpio = gpiochip_get_data(chip);
regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
BIT(offset), value ? BIT(offset) : 0);
}
static int lp87565_gpio_get_direction(struct gpio_chip *chip,
unsigned int offset)
{
struct lp87565_gpio *gpio = gpiochip_get_data(chip);
int ret, val;
ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
if (ret < 0)
return ret;
if (val & BIT(offset))
return GPIO_LINE_DIRECTION_OUT;
return GPIO_LINE_DIRECTION_IN;
}
static int lp87565_gpio_direction_input(struct gpio_chip *chip,
unsigned int offset)
{
struct lp87565_gpio *gpio = gpiochip_get_data(chip);
return regmap_update_bits(gpio->map,
LP87565_REG_GPIO_CONFIG,
BIT(offset), 0);
}
static int lp87565_gpio_direction_output(struct gpio_chip *chip,
unsigned int offset, int value)
{
struct lp87565_gpio *gpio = gpiochip_get_data(chip);
lp87565_gpio_set(chip, offset, value);
return regmap_update_bits(gpio->map,
LP87565_REG_GPIO_CONFIG,
BIT(offset), BIT(offset));
}
static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
{
struct lp87565_gpio *gpio = gpiochip_get_data(gc);
int ret;
switch (offset) {
case 0:
case 1:
case 2:
/*
* MUX can program the pin to be in EN1/2/3 pin mode
* Or GPIO1/2/3 mode.
* Setup the GPIO*_SEL MUX to GPIO mode
*/
ret = regmap_update_bits(gpio->map,
LP87565_REG_PIN_FUNCTION,
BIT(offset), BIT(offset));
if (ret)
return ret;
break;
default:
return -EINVAL;
}
return 0;
}
static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
unsigned long config)
{
struct lp87565_gpio *gpio = gpiochip_get_data(gc);
switch (pinconf_to_config_param(config)) {
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
return regmap_update_bits(gpio->map,
LP87565_REG_GPIO_CONFIG,
BIT(offset +
__ffs(LP87565_GOIO1_OD)),
BIT(offset +
__ffs(LP87565_GOIO1_OD)));
case PIN_CONFIG_DRIVE_PUSH_PULL:
return regmap_update_bits(gpio->map,
LP87565_REG_GPIO_CONFIG,
BIT(offset +
__ffs(LP87565_GOIO1_OD)), 0);
default:
return -ENOTSUPP;
}
}
static const struct gpio_chip template_chip = {
.label = "lp87565-gpio",
.owner = THIS_MODULE,
.request = lp87565_gpio_request,
.get_direction = lp87565_gpio_get_direction,
.direction_input = lp87565_gpio_direction_input,
.direction_output = lp87565_gpio_direction_output,
.get = lp87565_gpio_get,
.set = lp87565_gpio_set,
.set_config = lp87565_gpio_set_config,
.base = -1,
.ngpio = 3,
.can_sleep = true,
};
static int lp87565_gpio_probe(struct platform_device *pdev)
{
struct lp87565_gpio *gpio;
struct lp87565 *lp87565;
int ret;
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
if (!gpio)
return -ENOMEM;
lp87565 = dev_get_drvdata(pdev->dev.parent);
gpio->chip = template_chip;
gpio->chip.parent = lp87565->dev;
gpio->map = lp87565->regmap;
ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
if (ret < 0) {
dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
return ret;
}
return 0;
}
static const struct platform_device_id lp87565_gpio_id_table[] = {
{ "lp87565-q1-gpio", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
static struct platform_driver lp87565_gpio_driver = {
.driver = {
.name = "lp87565-gpio",
},
.probe = lp87565_gpio_probe,
.id_table = lp87565_gpio_id_table,
};
module_platform_driver(lp87565_gpio_driver);
MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
MODULE_DESCRIPTION("LP87565 GPIO driver");
MODULE_LICENSE("GPL v2");
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