func_prolog

Name:Prologue for the preempt and irqs off function tracers.* Returns 1 if it is OK to continue, and data->disabled is* incremented.* 0 if the trace is to be ignored, and data->disabled* is kept the same.* Note, this function is also used outside this ifdef but

Proto:static int func_prolog_dec(struct trace_array *tr, struct trace_array_cpu **data, unsigned long *flags)

Type:int

Parameter:

Type	Parameter	Name
struct trace_array *	tr
struct trace_array_cpu **	data
unsigned long *	flags

112

cpu = These macros fold the SMP functionality into a single CPU system()

113

If Value is more likely to compile time(!per_cpu(tracing_cpu, cpu)) Then Return 0

116

local_save_flags( * flags)

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If Not irqs_disabled_flags( * flags) && Not 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. Then Return 0

125

data = per_cpu_ptr(data, cpu)

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disabled = atomic_inc_return( & disabled)

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If Value is more likely to compile time(disabled == 1) Then Return 1

131

atomic_dec( & disabled)

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Return 0

**Caller**
Name	Describe
irqsoff_tracer_call	qsoff uses its own tracer function to keep the overhead down:

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Function report