trace_event_buffer_reserve

Name:trace_event_buffer_reserve

Proto:void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, struct trace_event_file *trace_file, unsigned long len)

Type:void

Parameter:

Type	Parameter	Name
struct trace_event_buffer *	fbuffer
struct trace_event_file *	trace_file
unsigned long	len

250

event_call = event_call

252

If * 32 bit flags: * bit 0: enabled * bit 1: enabled cmd record * bit 2: enable/disable with the soft disable bit * bit 3: soft disabled * bit 4: trigger enabled * Note: The bits must be set atomically to prevent races * from other writers. Reads of flags do & EVENT_FILE_FL_PID_FILTER && trace_event_ignore_this_pid(trace_file) Then Return NULL

256

local_save_flags(flags)

257

pc = We mask the PREEMPT_NEED_RESCHED bit so as not to confuse all current users* that think a non-zero value indicates we cannot preempt.

264

If IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',* 0 otherwise.(CONFIG_PREEMPTION) Then pc--

266

trace_file = trace_file

268

event = trace_event_buffer_lock_reserve( & buffer, trace_file, type, len, flags, pc)

272

If Not event Then Return NULL

275

entry = g_buffer_event_data - return the data of the event*@event: the event to get the data from

276

Return entry

**Caller**
Name	Describe
trace_inject_entry
trace_event_raw_event_synth

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