Revision 01599fca6758d2cd133e78f87426fc851c9ea725 authored by Andrew Morton on 13 April 2009, 17:27:49 UTC, committed by Linus Torvalds on 13 April 2009, 18:09:46 UTC
Atttempting to rid us of the problematic work_on_cpu(). Just use smp_call_fuction_single() here. This repairs a 10% sysbench(oltp)+mysql regression which Mike reported, due to commit 6b44003e5ca66a3fffeb5bc90f40ada2c4340896 Author: Andrew Morton <akpm@linux-foundation.org> Date: Thu Apr 9 09:50:37 2009 -0600 work_on_cpu(): rewrite it to create a kernel thread on demand It seems that the kernel calls these acpi-cpufreq functions at a quite high frequency. Valdis Kletnieks also reports that this causes 70-90 forks per second on his hardware. Cc: Valdis.Kletnieks@vt.edu Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Cc: Len Brown <len.brown@intel.com> Cc: Zhao Yakui <yakui.zhao@intel.com> Acked-by: Dave Jones <davej@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Tested-by: Mike Galbraith <efault@gmx.de> Cc: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Ingo Molnar <mingo@elte.hu> [ Made it use smp_call_function_many() instead of looping over cpu's with smp_call_function_single() - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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aoa-gpio.h
/*
* Apple Onboard Audio GPIO definitions
*
* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
*
* GPL v2, can be found in COPYING.
*/
#ifndef __AOA_GPIO_H
#define __AOA_GPIO_H
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include <asm/prom.h>
typedef void (*notify_func_t)(void *data);
enum notify_type {
AOA_NOTIFY_HEADPHONE,
AOA_NOTIFY_LINE_IN,
AOA_NOTIFY_LINE_OUT,
};
struct gpio_runtime;
struct gpio_methods {
/* for initialisation/de-initialisation of the GPIO layer */
void (*init)(struct gpio_runtime *rt);
void (*exit)(struct gpio_runtime *rt);
/* turn off headphone, speakers, lineout */
void (*all_amps_off)(struct gpio_runtime *rt);
/* turn headphone, speakers, lineout back to previous setting */
void (*all_amps_restore)(struct gpio_runtime *rt);
void (*set_headphone)(struct gpio_runtime *rt, int on);
void (*set_speakers)(struct gpio_runtime *rt, int on);
void (*set_lineout)(struct gpio_runtime *rt, int on);
void (*set_master)(struct gpio_runtime *rt, int on);
int (*get_headphone)(struct gpio_runtime *rt);
int (*get_speakers)(struct gpio_runtime *rt);
int (*get_lineout)(struct gpio_runtime *rt);
int (*get_master)(struct gpio_runtime *rt);
void (*set_hw_reset)(struct gpio_runtime *rt, int on);
/* use this to be notified of any events. The notification
* function is passed the data, and is called in process
* context by the use of schedule_work.
* The interface for it is that setting a function to NULL
* removes it, and they return 0 if the operation succeeded,
* and -EBUSY if the notification is already assigned by
* someone else. */
int (*set_notify)(struct gpio_runtime *rt,
enum notify_type type,
notify_func_t notify,
void *data);
/* returns 0 if not plugged in, 1 if plugged in
* or a negative error code */
int (*get_detect)(struct gpio_runtime *rt,
enum notify_type type);
};
struct gpio_notification {
struct delayed_work work;
notify_func_t notify;
void *data;
void *gpio_private;
struct mutex mutex;
};
struct gpio_runtime {
/* to be assigned by fabric */
struct device_node *node;
/* since everyone needs this pointer anyway... */
struct gpio_methods *methods;
/* to be used by the gpio implementation */
int implementation_private;
struct gpio_notification headphone_notify;
struct gpio_notification line_in_notify;
struct gpio_notification line_out_notify;
};
#endif /* __AOA_GPIO_H */
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