read_seqcount

函数名称：ad_seqcount_begin - begin a seq-read critical section*@s: pointer to seqcount_t* Returns: count to be passed to read_seqcount_retry* read_seqcount_begin opens a read critical section of the given seqcount

函数原型：static inline unsigned read_seqcount_begin(const seqcount_t *s)

返回类型：unsigned

参数：

类型	参数	名称
const seqcount_t *	s

**调用者**
名称	描述
fprop_fraction_single	Return fraction of events of type pl
fprop_fraction_percpu
get_recent_times
ktime_get_real_ts64	ktime_get_real_ts64 - Returns the time of day in a timespec64.@ts: pointer to the timespec to be set Returns the time of day in a timespec64 (WARN if suspended).
ktime_get
ktime_get_resolution_ns
ktime_get_with_offset
ktime_get_coarse_with_offset
ktime_mono_to_any	ktime_mono_to_any() - convert mononotic time to any other time@tmono: time to convert.@offs: which offset to use
ktime_get_raw	ktime_get_raw - Returns the raw monotonic time in ktime_t format
ktime_get_ts64	ktime_get_ts64 - get the monotonic clock in timespec64 format@ts: pointer to timespec variable The function calculates the monotonic clock from the realtime* clock and the wall_to_monotonic offset and stores the result
ktime_get_real_seconds	ktime_get_real_seconds - Get the seconds portion of CLOCK_REALTIME* Returns the wall clock seconds since 1970. This replaces the* get_seconds() interface which is not y2038 safe on 32bit systems.
ktime_get_snapshot	ktime_get_snapshot - snapshots the realtime/monotonic raw clocks with counter*@systime_snapshot: pointer to struct receiving the system time snapshot
get_device_system_crosststamp	get_device_system_crosststamp - Synchronously capture system/device timestamp@get_time_fn: Callback to get simultaneous device time and system counter from the device driver@ctx: Context passed to get_time_fn()@history_begin: Historical reference
ktime_get_raw_ts64	ktime_get_raw_ts64 - Returns the raw monotonic time in a timespec@ts: pointer to the timespec64 to be set Returns the raw monotonic time (completely un-modified by ntp)
timekeeping_valid_for_hres	mekeeping_valid_for_hres - Check if timekeeping is suitable for hres
timekeeping_max_deferment	mekeeping_max_deferment - Returns max time the clocksource can be deferred
ktime_get_coarse_real_ts64
ktime_get_coarse_ts64
ktime_get_update_offsets_now	ktime_get_update_offsets_now - hrtimer helper@cwsseq: pointer to check and store the clock was set sequence number@offs_real: pointer to storage for monotonic -> realtime offset@offs_boot: pointer to storage for monotonic -> boottime offset@offs_tai:
ioc_now	ake a snapshot of the current [v]time and vrate
set_root
__follow_mount_rcu	Try to skip to top of mountpoint pile in rcuwalk mode. Fail if* we meet a managed dentry that would need blocking.
follow_dotdot_rcu
path_init	must be paired with terminate_walk()
get_fs_root_rcu
get_fs_root_and_pwd_rcu
wake_userfault
read_seqbegin	Read side functions for starting and finalizing a read side section.

函数逻辑报告