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tracing: Split tracing initialization into two for early initialization

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Create an early_trace_init() function that will initialize the buffers and
allow for ealier use of trace_printk(). This will also allow for future work
to have function tracing start earlier at boot up.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2017-03-03 13:37:33 -05:00
parent 97da3854c5
commit e725c731e3
3 changed files with 11 additions and 2 deletions
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5
init/main.c
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@ -545,6 +545,9 @@ asmlinkage __visible void __init start_kernel(void)
trap_init();
mm_init();
/* trace_printk can be enabled here */
early_trace_init();
/*
* Set up the scheduler prior starting any interrupts (such as the
* timer interrupt). Full topology setup happens at smp_init()
@ -570,7 +573,7 @@ asmlinkage __visible void __init start_kernel(void)
rcu_init();
/* trace_printk() and trace points may be used after this */
/* Trace events are available after this */
trace_init();
context_tracking_init();