On Friday, 21 September 2007 21:36, Alan Stern wrote:
> This patch (as993) merges the suspend.c and resume.c files in
> drivers/base/power into main.c, making some public symbols private.
>
> Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Acked-by: Rafael J. Wysocki <rjw@xxxxxxx>
> ---
>
> Index: usb-2.6/drivers/base/power/Makefile
> ===================================================================
> --- usb-2.6.orig/drivers/base/power/Makefile
> +++ usb-2.6/drivers/base/power/Makefile
> @@ -1,5 +1,5 @@
> obj-y := shutdown.o
> -obj-$(CONFIG_PM_SLEEP) += main.o suspend.o resume.o sysfs.o
> +obj-$(CONFIG_PM_SLEEP) += main.o sysfs.o
> obj-$(CONFIG_PM_TRACE) += trace.o
>
> ifeq ($(CONFIG_DEBUG_DRIVER),y)
> Index: usb-2.6/drivers/base/power/power.h
> ===================================================================
> --- usb-2.6.orig/drivers/base/power/power.h
> +++ usb-2.6/drivers/base/power/power.h
> @@ -11,32 +11,11 @@ extern void device_shutdown(void);
> * main.c
> */
>
> -/*
> - * Used to synchronize global power management operations.
> - */
> -extern struct mutex dpm_mtx;
> -
> -/*
> - * Used to serialize changes to the dpm_* lists.
> - */
> -extern struct mutex dpm_list_mtx;
> -
> -/*
> - * The PM lists.
> - */
> -extern struct list_head dpm_active;
> -extern struct list_head dpm_off;
> -extern struct list_head dpm_off_irq;
> -
> -
> -static inline struct dev_pm_info * to_pm_info(struct list_head * entry)
> -{
> - return container_of(entry, struct dev_pm_info, entry);
> -}
> +extern struct list_head dpm_active; /* The active device list */
>
> static inline struct device * to_device(struct list_head * entry)
> {
> - return container_of(to_pm_info(entry), struct device, power);
> + return container_of(entry, struct device, power.entry);
> }
>
> extern int device_pm_add(struct device *);
> @@ -49,13 +28,6 @@ extern void device_pm_remove(struct devi
> extern int dpm_sysfs_add(struct device *);
> extern void dpm_sysfs_remove(struct device *);
>
> -/*
> - * resume.c
> - */
> -
> -extern void dpm_resume(void);
> -extern void dpm_power_up(void);
> -
> #else /* CONFIG_PM_SLEEP */
>
>
> Index: usb-2.6/drivers/base/power/main.c
> ===================================================================
> --- usb-2.6.orig/drivers/base/power/main.c
> +++ usb-2.6/drivers/base/power/main.c
> @@ -20,19 +20,24 @@
> */
>
> #include <linux/device.h>
> +#include <linux/kallsyms.h>
> #include <linux/mutex.h>
> +#include <linux/pm.h>
> +#include <linux/resume-trace.h>
>
> +#include "../base.h"
> #include "power.h"
>
> LIST_HEAD(dpm_active);
> -LIST_HEAD(dpm_off);
> -LIST_HEAD(dpm_off_irq);
> +static LIST_HEAD(dpm_off);
> +static LIST_HEAD(dpm_off_irq);
>
> -DEFINE_MUTEX(dpm_mtx);
> -DEFINE_MUTEX(dpm_list_mtx);
> +static DEFINE_MUTEX(dpm_mtx);
> +static DEFINE_MUTEX(dpm_list_mtx);
>
> int (*platform_enable_wakeup)(struct device *dev, int is_on);
>
> +
> int device_pm_add(struct device *dev)
> {
> int error;
> @@ -61,3 +66,334 @@ void device_pm_remove(struct device *dev
> }
>
>
> +/*------------------------- Resume routines -------------------------*/
> +
> +/**
> + * resume_device - Restore state for one device.
> + * @dev: Device.
> + *
> + */
> +
> +static int resume_device(struct device * dev)
> +{
> + int error = 0;
> +
> + TRACE_DEVICE(dev);
> + TRACE_RESUME(0);
> +
> + down(&dev->sem);
> +
> + if (dev->bus && dev->bus->resume) {
> + dev_dbg(dev,"resuming\n");
> + error = dev->bus->resume(dev);
> + }
> +
> + if (!error && dev->type && dev->type->resume) {
> + dev_dbg(dev,"resuming\n");
> + error = dev->type->resume(dev);
> + }
> +
> + if (!error && dev->class && dev->class->resume) {
> + dev_dbg(dev,"class resume\n");
> + error = dev->class->resume(dev);
> + }
> +
> + up(&dev->sem);
> +
> + TRACE_RESUME(error);
> + return error;
> +}
> +
> +
> +static int resume_device_early(struct device * dev)
> +{
> + int error = 0;
> +
> + TRACE_DEVICE(dev);
> + TRACE_RESUME(0);
> + if (dev->bus && dev->bus->resume_early) {
> + dev_dbg(dev,"EARLY resume\n");
> + error = dev->bus->resume_early(dev);
> + }
> + TRACE_RESUME(error);
> + return error;
> +}
> +
> +/*
> + * Resume the devices that have either not gone through
> + * the late suspend, or that did go through it but also
> + * went through the early resume
> + */
> +static void dpm_resume(void)
> +{
> + mutex_lock(&dpm_list_mtx);
> + while(!list_empty(&dpm_off)) {
> + struct list_head * entry = dpm_off.next;
> + struct device * dev = to_device(entry);
> +
> + get_device(dev);
> + list_move_tail(entry, &dpm_active);
> +
> + mutex_unlock(&dpm_list_mtx);
> + resume_device(dev);
> + mutex_lock(&dpm_list_mtx);
> + put_device(dev);
> + }
> + mutex_unlock(&dpm_list_mtx);
> +}
> +
> +
> +/**
> + * device_resume - Restore state of each device in system.
> + *
> + * Walk the dpm_off list, remove each entry, resume the device,
> + * then add it to the dpm_active list.
> + */
> +
> +void device_resume(void)
> +{
> + might_sleep();
> + mutex_lock(&dpm_mtx);
> + dpm_resume();
> + mutex_unlock(&dpm_mtx);
> +}
> +
> +EXPORT_SYMBOL_GPL(device_resume);
> +
> +
> +/**
> + * dpm_power_up - Power on some devices.
> + *
> + * Walk the dpm_off_irq list and power each device up. This
> + * is used for devices that required they be powered down with
> + * interrupts disabled. As devices are powered on, they are moved
> + * to the dpm_active list.
> + *
> + * Interrupts must be disabled when calling this.
> + */
> +
> +static void dpm_power_up(void)
> +{
> + while(!list_empty(&dpm_off_irq)) {
> + struct list_head * entry = dpm_off_irq.next;
> + struct device * dev = to_device(entry);
> +
> + list_move_tail(entry, &dpm_off);
> + resume_device_early(dev);
> + }
> +}
> +
> +
> +/**
> + * device_power_up - Turn on all devices that need special attention.
> + *
> + * Power on system devices then devices that required we shut them down
> + * with interrupts disabled.
> + * Called with interrupts disabled.
> + */
> +
> +void device_power_up(void)
> +{
> + sysdev_resume();
> + dpm_power_up();
> +}
> +
> +EXPORT_SYMBOL_GPL(device_power_up);
> +
> +
> +/*------------------------- Suspend routines -------------------------*/
> +
> +/*
> + * The entries in the dpm_active list are in a depth first order, simply
> + * because children are guaranteed to be discovered after parents, and
> + * are inserted at the back of the list on discovery.
> + *
> + * All list on the suspend path are done in reverse order, so we operate
> + * on the leaves of the device tree (or forests, depending on how you want
> + * to look at it ;) first. As nodes are removed from the back of the list,
> + * they are inserted into the front of their destintation lists.
> + *
> + * Things are the reverse on the resume path - iterations are done in
> + * forward order, and nodes are inserted at the back of their destination
> + * lists. This way, the ancestors will be accessed before their descendents.
> + */
> +
> +static inline char *suspend_verb(u32 event)
> +{
> + switch (event) {
> + case PM_EVENT_SUSPEND: return "suspend";
> + case PM_EVENT_FREEZE: return "freeze";
> + case PM_EVENT_PRETHAW: return "prethaw";
> + default: return "(unknown suspend event)";
> + }
> +}
> +
> +
> +static void
> +suspend_device_dbg(struct device *dev, pm_message_t state, char *info)
> +{
> + dev_dbg(dev, "%s%s%s\n", info, suspend_verb(state.event),
> + ((state.event == PM_EVENT_SUSPEND) && device_may_wakeup(dev)) ?
> + ", may wakeup" : "");
> +}
> +
> +/**
> + * suspend_device - Save state of one device.
> + * @dev: Device.
> + * @state: Power state device is entering.
> + */
> +
> +static int suspend_device(struct device * dev, pm_message_t state)
> +{
> + int error = 0;
> +
> + down(&dev->sem);
> + if (dev->power.power_state.event) {
> + dev_dbg(dev, "PM: suspend %d-->%d\n",
> + dev->power.power_state.event, state.event);
> + }
> +
> + if (dev->class && dev->class->suspend) {
> + suspend_device_dbg(dev, state, "class ");
> + error = dev->class->suspend(dev, state);
> + suspend_report_result(dev->class->suspend, error);
> + }
> +
> + if (!error && dev->type && dev->type->suspend) {
> + suspend_device_dbg(dev, state, "type ");
> + error = dev->type->suspend(dev, state);
> + suspend_report_result(dev->type->suspend, error);
> + }
> +
> + if (!error && dev->bus && dev->bus->suspend) {
> + suspend_device_dbg(dev, state, "");
> + error = dev->bus->suspend(dev, state);
> + suspend_report_result(dev->bus->suspend, error);
> + }
> + up(&dev->sem);
> + return error;
> +}
> +
> +
> +/*
> + * This is called with interrupts off, only a single CPU
> + * running. We can't acquire a mutex or semaphore (and we don't
> + * need the protection)
> + */
> +static int suspend_device_late(struct device *dev, pm_message_t state)
> +{
> + int error = 0;
> +
> + if (dev->bus && dev->bus->suspend_late) {
> + suspend_device_dbg(dev, state, "LATE ");
> + error = dev->bus->suspend_late(dev, state);
> + suspend_report_result(dev->bus->suspend_late, error);
> + }
> + return error;
> +}
> +
> +/**
> + * device_suspend - Save state and stop all devices in system.
> + * @state: Power state to put each device in.
> + *
> + * Walk the dpm_active list, call ->suspend() for each device, and move
> + * it to the dpm_off list.
> + *
> + * (For historical reasons, if it returns -EAGAIN, that used to mean
> + * that the device would be called again with interrupts disabled.
> + * These days, we use the "suspend_late()" callback for that, so we
> + * print a warning and consider it an error).
> + *
> + * If we get a different error, try and back out.
> + *
> + * If we hit a failure with any of the devices, call device_resume()
> + * above to bring the suspended devices back to life.
> + *
> + */
> +
> +int device_suspend(pm_message_t state)
> +{
> + int error = 0;
> +
> + might_sleep();
> + mutex_lock(&dpm_mtx);
> + mutex_lock(&dpm_list_mtx);
> + while (!list_empty(&dpm_active) && error == 0) {
> + struct list_head * entry = dpm_active.prev;
> + struct device * dev = to_device(entry);
> +
> + get_device(dev);
> + mutex_unlock(&dpm_list_mtx);
> +
> + error = suspend_device(dev, state);
> +
> + mutex_lock(&dpm_list_mtx);
> +
> + /* Check if the device got removed */
> + if (!list_empty(&dev->power.entry)) {
> + /* Move it to the dpm_off list */
> + if (!error)
> + list_move(&dev->power.entry, &dpm_off);
> + }
> + if (error)
> + printk(KERN_ERR "Could not suspend device %s: "
> + "error %d%s\n",
> + kobject_name(&dev->kobj), error,
> + error == -EAGAIN ? " (please convert to suspend_late)" : "");
> + put_device(dev);
> + }
> + mutex_unlock(&dpm_list_mtx);
> + if (error)
> + dpm_resume();
> +
> + mutex_unlock(&dpm_mtx);
> + return error;
> +}
> +
> +EXPORT_SYMBOL_GPL(device_suspend);
> +
> +/**
> + * device_power_down - Shut down special devices.
> + * @state: Power state to enter.
> + *
> + * Walk the dpm_off_irq list, calling ->power_down() for each device that
> + * couldn't power down the device with interrupts enabled. When we're
> + * done, power down system devices.
> + */
> +
> +int device_power_down(pm_message_t state)
> +{
> + int error = 0;
> + struct device * dev;
> +
> + while (!list_empty(&dpm_off)) {
> + struct list_head * entry = dpm_off.prev;
> +
> + dev = to_device(entry);
> + error = suspend_device_late(dev, state);
> + if (error)
> + goto Error;
> + list_move(&dev->power.entry, &dpm_off_irq);
> + }
> +
> + error = sysdev_suspend(state);
> + Done:
> + return error;
> + Error:
> + printk(KERN_ERR "Could not power down device %s: "
> + "error %d\n", kobject_name(&dev->kobj), error);
> + dpm_power_up();
> + goto Done;
> +}
> +
> +EXPORT_SYMBOL_GPL(device_power_down);
> +
> +void __suspend_report_result(const char *function, void *fn, int ret)
> +{
> + if (ret) {
> + printk(KERN_ERR "%s(): ", function);
> + print_fn_descriptor_symbol("%s() returns ", (unsigned long)fn);
> + printk("%d\n", ret);
> + }
> +}
> +EXPORT_SYMBOL_GPL(__suspend_report_result);
> Index: usb-2.6/drivers/base/power/resume.c
> ===================================================================
> --- usb-2.6.orig/drivers/base/power/resume.c
> +++ /dev/null
> @@ -1,149 +0,0 @@
> -/*
> - * resume.c - Functions for waking devices up.
> - *
> - * Copyright (c) 2003 Patrick Mochel
> - * Copyright (c) 2003 Open Source Development Labs
> - *
> - * This file is released under the GPLv2
> - *
> - */
> -
> -#include <linux/device.h>
> -#include <linux/resume-trace.h>
> -#include "../base.h"
> -#include "power.h"
> -
> -
> -/**
> - * resume_device - Restore state for one device.
> - * @dev: Device.
> - *
> - */
> -
> -static int resume_device(struct device * dev)
> -{
> - int error = 0;
> -
> - TRACE_DEVICE(dev);
> - TRACE_RESUME(0);
> -
> - down(&dev->sem);
> -
> - if (dev->bus && dev->bus->resume) {
> - dev_dbg(dev,"resuming\n");
> - error = dev->bus->resume(dev);
> - }
> -
> - if (!error && dev->type && dev->type->resume) {
> - dev_dbg(dev,"resuming\n");
> - error = dev->type->resume(dev);
> - }
> -
> - if (!error && dev->class && dev->class->resume) {
> - dev_dbg(dev,"class resume\n");
> - error = dev->class->resume(dev);
> - }
> -
> - up(&dev->sem);
> -
> - TRACE_RESUME(error);
> - return error;
> -}
> -
> -
> -static int resume_device_early(struct device * dev)
> -{
> - int error = 0;
> -
> - TRACE_DEVICE(dev);
> - TRACE_RESUME(0);
> - if (dev->bus && dev->bus->resume_early) {
> - dev_dbg(dev,"EARLY resume\n");
> - error = dev->bus->resume_early(dev);
> - }
> - TRACE_RESUME(error);
> - return error;
> -}
> -
> -/*
> - * Resume the devices that have either not gone through
> - * the late suspend, or that did go through it but also
> - * went through the early resume
> - */
> -void dpm_resume(void)
> -{
> - mutex_lock(&dpm_list_mtx);
> - while(!list_empty(&dpm_off)) {
> - struct list_head * entry = dpm_off.next;
> - struct device * dev = to_device(entry);
> -
> - get_device(dev);
> - list_move_tail(entry, &dpm_active);
> -
> - mutex_unlock(&dpm_list_mtx);
> - resume_device(dev);
> - mutex_lock(&dpm_list_mtx);
> - put_device(dev);
> - }
> - mutex_unlock(&dpm_list_mtx);
> -}
> -
> -
> -/**
> - * device_resume - Restore state of each device in system.
> - *
> - * Walk the dpm_off list, remove each entry, resume the device,
> - * then add it to the dpm_active list.
> - */
> -
> -void device_resume(void)
> -{
> - might_sleep();
> - mutex_lock(&dpm_mtx);
> - dpm_resume();
> - mutex_unlock(&dpm_mtx);
> -}
> -
> -EXPORT_SYMBOL_GPL(device_resume);
> -
> -
> -/**
> - * dpm_power_up - Power on some devices.
> - *
> - * Walk the dpm_off_irq list and power each device up. This
> - * is used for devices that required they be powered down with
> - * interrupts disabled. As devices are powered on, they are moved
> - * to the dpm_active list.
> - *
> - * Interrupts must be disabled when calling this.
> - */
> -
> -void dpm_power_up(void)
> -{
> - while(!list_empty(&dpm_off_irq)) {
> - struct list_head * entry = dpm_off_irq.next;
> - struct device * dev = to_device(entry);
> -
> - list_move_tail(entry, &dpm_off);
> - resume_device_early(dev);
> - }
> -}
> -
> -
> -/**
> - * device_power_up - Turn on all devices that need special attention.
> - *
> - * Power on system devices then devices that required we shut them down
> - * with interrupts disabled.
> - * Called with interrupts disabled.
> - */
> -
> -void device_power_up(void)
> -{
> - sysdev_resume();
> - dpm_power_up();
> -}
> -
> -EXPORT_SYMBOL_GPL(device_power_up);
> -
> -
> Index: usb-2.6/drivers/base/power/suspend.c
> ===================================================================
> --- usb-2.6.orig/drivers/base/power/suspend.c
> +++ /dev/null
> @@ -1,210 +0,0 @@
> -/*
> - * suspend.c - Functions for putting devices to sleep.
> - *
> - * Copyright (c) 2003 Patrick Mochel
> - * Copyright (c) 2003 Open Source Development Labs
> - *
> - * This file is released under the GPLv2
> - *
> - */
> -
> -#include <linux/device.h>
> -#include <linux/kallsyms.h>
> -#include <linux/pm.h>
> -#include "../base.h"
> -#include "power.h"
> -
> -/*
> - * The entries in the dpm_active list are in a depth first order, simply
> - * because children are guaranteed to be discovered after parents, and
> - * are inserted at the back of the list on discovery.
> - *
> - * All list on the suspend path are done in reverse order, so we operate
> - * on the leaves of the device tree (or forests, depending on how you want
> - * to look at it ;) first. As nodes are removed from the back of the list,
> - * they are inserted into the front of their destintation lists.
> - *
> - * Things are the reverse on the resume path - iterations are done in
> - * forward order, and nodes are inserted at the back of their destination
> - * lists. This way, the ancestors will be accessed before their descendents.
> - */
> -
> -static inline char *suspend_verb(u32 event)
> -{
> - switch (event) {
> - case PM_EVENT_SUSPEND: return "suspend";
> - case PM_EVENT_FREEZE: return "freeze";
> - case PM_EVENT_PRETHAW: return "prethaw";
> - default: return "(unknown suspend event)";
> - }
> -}
> -
> -
> -static void
> -suspend_device_dbg(struct device *dev, pm_message_t state, char *info)
> -{
> - dev_dbg(dev, "%s%s%s\n", info, suspend_verb(state.event),
> - ((state.event == PM_EVENT_SUSPEND) && device_may_wakeup(dev)) ?
> - ", may wakeup" : "");
> -}
> -
> -/**
> - * suspend_device - Save state of one device.
> - * @dev: Device.
> - * @state: Power state device is entering.
> - */
> -
> -static int suspend_device(struct device * dev, pm_message_t state)
> -{
> - int error = 0;
> -
> - down(&dev->sem);
> - if (dev->power.power_state.event) {
> - dev_dbg(dev, "PM: suspend %d-->%d\n",
> - dev->power.power_state.event, state.event);
> - }
> -
> - if (dev->class && dev->class->suspend) {
> - suspend_device_dbg(dev, state, "class ");
> - error = dev->class->suspend(dev, state);
> - suspend_report_result(dev->class->suspend, error);
> - }
> -
> - if (!error && dev->type && dev->type->suspend) {
> - suspend_device_dbg(dev, state, "type ");
> - error = dev->type->suspend(dev, state);
> - suspend_report_result(dev->type->suspend, error);
> - }
> -
> - if (!error && dev->bus && dev->bus->suspend) {
> - suspend_device_dbg(dev, state, "");
> - error = dev->bus->suspend(dev, state);
> - suspend_report_result(dev->bus->suspend, error);
> - }
> - up(&dev->sem);
> - return error;
> -}
> -
> -
> -/*
> - * This is called with interrupts off, only a single CPU
> - * running. We can't acquire a mutex or semaphore (and we don't
> - * need the protection)
> - */
> -static int suspend_device_late(struct device *dev, pm_message_t state)
> -{
> - int error = 0;
> -
> - if (dev->bus && dev->bus->suspend_late) {
> - suspend_device_dbg(dev, state, "LATE ");
> - error = dev->bus->suspend_late(dev, state);
> - suspend_report_result(dev->bus->suspend_late, error);
> - }
> - return error;
> -}
> -
> -/**
> - * device_suspend - Save state and stop all devices in system.
> - * @state: Power state to put each device in.
> - *
> - * Walk the dpm_active list, call ->suspend() for each device, and move
> - * it to the dpm_off list.
> - *
> - * (For historical reasons, if it returns -EAGAIN, that used to mean
> - * that the device would be called again with interrupts disabled.
> - * These days, we use the "suspend_late()" callback for that, so we
> - * print a warning and consider it an error).
> - *
> - * If we get a different error, try and back out.
> - *
> - * If we hit a failure with any of the devices, call device_resume()
> - * above to bring the suspended devices back to life.
> - *
> - */
> -
> -int device_suspend(pm_message_t state)
> -{
> - int error = 0;
> -
> - might_sleep();
> - mutex_lock(&dpm_mtx);
> - mutex_lock(&dpm_list_mtx);
> - while (!list_empty(&dpm_active) && error == 0) {
> - struct list_head * entry = dpm_active.prev;
> - struct device * dev = to_device(entry);
> -
> - get_device(dev);
> - mutex_unlock(&dpm_list_mtx);
> -
> - error = suspend_device(dev, state);
> -
> - mutex_lock(&dpm_list_mtx);
> -
> - /* Check if the device got removed */
> - if (!list_empty(&dev->power.entry)) {
> - /* Move it to the dpm_off list */
> - if (!error)
> - list_move(&dev->power.entry, &dpm_off);
> - }
> - if (error)
> - printk(KERN_ERR "Could not suspend device %s: "
> - "error %d%s\n",
> - kobject_name(&dev->kobj), error,
> - error == -EAGAIN ? " (please convert to suspend_late)" : "");
> - put_device(dev);
> - }
> - mutex_unlock(&dpm_list_mtx);
> - if (error)
> - dpm_resume();
> -
> - mutex_unlock(&dpm_mtx);
> - return error;
> -}
> -
> -EXPORT_SYMBOL_GPL(device_suspend);
> -
> -/**
> - * device_power_down - Shut down special devices.
> - * @state: Power state to enter.
> - *
> - * Walk the dpm_off_irq list, calling ->power_down() for each device that
> - * couldn't power down the device with interrupts enabled. When we're
> - * done, power down system devices.
> - */
> -
> -int device_power_down(pm_message_t state)
> -{
> - int error = 0;
> - struct device * dev;
> -
> - while (!list_empty(&dpm_off)) {
> - struct list_head * entry = dpm_off.prev;
> -
> - dev = to_device(entry);
> - error = suspend_device_late(dev, state);
> - if (error)
> - goto Error;
> - list_move(&dev->power.entry, &dpm_off_irq);
> - }
> -
> - error = sysdev_suspend(state);
> - Done:
> - return error;
> - Error:
> - printk(KERN_ERR "Could not power down device %s: "
> - "error %d\n", kobject_name(&dev->kobj), error);
> - dpm_power_up();
> - goto Done;
> -}
> -
> -EXPORT_SYMBOL_GPL(device_power_down);
> -
> -void __suspend_report_result(const char *function, void *fn, int ret)
> -{
> - if (ret) {
> - printk(KERN_ERR "%s(): ", function);
> - print_fn_descriptor_symbol("%s() returns ", (unsigned long)fn);
> - printk("%d\n", ret);
> - }
> -}
> -EXPORT_SYMBOL_GPL(__suspend_report_result);
>
> _______________________________________________
> linux-pm mailing list
> linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx
> https://lists.linux-foundation.org/mailman/listinfo/linux-pm
>
>
--
"Premature optimization is the root of all evil." - Donald Knuth
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