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/*
 * pm_clock.h - Definitions and headers related to device clocks.
 *
 * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
 *
 * This file is released under the GPLv2.
 */

#ifndef _LINUX_PM_CLOCK_H
#define _LINUX_PM_CLOCK_H

#include <linux/device.h>
#include <linux/notifier.h>

struct pm_clk_notifier_block {
	struct notifier_block nb;
	struct dev_pm_domain *pm_domain;
	char *con_ids[];
};

struct clk;

#ifdef CONFIG_PM_CLK
static inline bool pm_clk_no_clocks(struct device *dev)
{
	return dev && dev->power.subsys_data
		&& list_empty(&dev->power.subsys_data->clock_list);
}

extern void pm_clk_init(struct device *dev);
extern int pm_clk_create(struct device *dev);
extern void pm_clk_destroy(struct device *dev);
extern int pm_clk_add(struct device *dev, const char *con_id);
extern int pm_clk_add_clk(struct device *dev, struct clk *clk);
extern void pm_clk_remove(struct device *dev, const char *con_id);
extern int pm_clk_suspend(struct device *dev);
extern int pm_clk_resume(struct device *dev);
#else
static inline bool pm_clk_no_clocks(struct device *dev)
{
	return true;
}
static inline void pm_clk_init(struct device *dev)
{
}
static inline int pm_clk_create(struct device *dev)
{
	return -EINVAL;
}
static inline void pm_clk_destroy(struct device *dev)
{
}
static inline int pm_clk_add(struct device *dev, const char *con_id)
{
	return -EINVAL;
}

static inline int pm_clk_add_clk(struct device *dev, struct clk *clk)
{
	return -EINVAL;
}
static inline void pm_clk_remove(struct device *dev, const char *con_id)
{
}
#define pm_clk_suspend	NULL
#define pm_clk_resume	NULL
#endif

#ifdef CONFIG_HAVE_CLK
extern void pm_clk_add_notifier(struct bus_type *bus,
					struct pm_clk_notifier_block *clknb);
#else
static inline void pm_clk_add_notifier(struct bus_type *bus,
					struct pm_clk_notifier_block *clknb)
{
}
#endif

#endif
pan class="p">} /** * tracehook_report_syscall_entry - task is about to attempt a system call * @regs: user register state of current task * * This will be called if %TIF_SYSCALL_TRACE has been set, when the * current task has just entered the kernel for a system call. * Full user register state is available here. Changing the values * in @regs can affect the system call number and arguments to be tried. * It is safe to block here, preventing the system call from beginning. * * Returns zero normally, or nonzero if the calling arch code should abort * the system call. That must prevent normal entry so no system call is * made. If @task ever returns to user mode after this, its register state * is unspecified, but should be something harmless like an %ENOSYS error * return. It should preserve enough information so that syscall_rollback() * can work (see asm-generic/syscall.h). * * Called without locks, just after entering kernel mode. */ static inline __must_check int tracehook_report_syscall_entry( struct pt_regs *regs) { return ptrace_report_syscall(regs); } /** * tracehook_report_syscall_exit - task has just finished a system call * @regs: user register state of current task * @step: nonzero if simulating single-step or block-step * * This will be called if %TIF_SYSCALL_TRACE has been set, when the * current task has just finished an attempted system call. Full * user register state is available here. It is safe to block here, * preventing signals from being processed. * * If @step is nonzero, this report is also in lieu of the normal * trap that would follow the system call instruction because * user_enable_block_step() or user_enable_single_step() was used. * In this case, %TIF_SYSCALL_TRACE might not be set. * * Called without locks, just before checking for pending signals. */ static inline void tracehook_report_syscall_exit(struct pt_regs *regs, int step) { if (step) { siginfo_t info; user_single_step_siginfo(current, regs, &info); force_sig_info(SIGTRAP, &info, current); return; } ptrace_report_syscall(regs); } /** * tracehook_signal_handler - signal handler setup is complete * @stepping: nonzero if debugger single-step or block-step in use * * Called by the arch code after a signal handler has been set up. * Register and stack state reflects the user handler about to run. * Signal mask changes have already been made. * * Called without locks, shortly before returning to user mode * (or handling more signals). */ static inline void tracehook_signal_handler(int stepping) { if (stepping) ptrace_notify(SIGTRAP); } /** * set_notify_resume - cause tracehook_notify_resume() to be called * @task: task that will call tracehook_notify_resume() * * Calling this arranges that @task will call tracehook_notify_resume() * before returning to user mode. If it's already running in user mode, * it will enter the kernel and call tracehook_notify_resume() soon. * If it's blocked, it will not be woken. */ static inline void set_notify_resume(struct task_struct *task) { #ifdef TIF_NOTIFY_RESUME if (!test_and_set_tsk_thread_flag(task, TIF_NOTIFY_RESUME)) kick_process(task); #endif } /** * tracehook_notify_resume - report when about to return to user mode * @regs: user-mode registers of @current task * * This is called when %TIF_NOTIFY_RESUME has been set. Now we are * about to return to user mode, and the user state in @regs can be * inspected or adjusted. The caller in arch code has cleared * %TIF_NOTIFY_RESUME before the call. If the flag gets set again * asynchronously, this will be called again before we return to * user mode. * * Called without locks. */ static inline void tracehook_notify_resume(struct pt_regs *regs) { /* * The caller just cleared TIF_NOTIFY_RESUME. This barrier * pairs with task_work_add()->set_notify_resume() after * hlist_add_head(task->task_works); */ smp_mb__after_atomic(); if (unlikely(current->task_works)) task_work_run(); } #endif /* <linux/tracehook.h> */