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tracing: Move enabling tracepoints to just after rcu_init()

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Enabling tracepoints at boot up can be very useful. The tracepoint
can be initialized right after RCU has been. There's no need to
wait for the early_initcall() to be called. That's too late for some
things that can use tracepoints for debugging. Move the logic to
enable tracepoints out of the initcalls and into init/main.c to
right after rcu_init().

This also allows trace_printk() to be used early too.

Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1412121539300.16494@nanos
Link: http://lkml.kernel.org/r/[email protected]

Reviewed-by: Paul E. McKenney <[email protected]>
Suggested-by: Thomas Gleixner <[email protected]>
Tested-by: Thomas Gleixner <[email protected]>
Acked-by: Thomas Gleixner <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-12-12 20:05:10 -05:00 • committed by Steven Rostedt
commit 5f893b2639
6 changed files with 40 additions and 8 deletions
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4
init/main.c
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@ -577,6 +577,10 @@ asmlinkage __visible void __init start_kernel(void)
local_irq_disable();
idr_init_cache();
rcu_init();
/* trace_printk() and trace points may be used after this */
trace_init();
context_tracking_init();
radix_tree_init();
/* init some links before init_ISA_irqs() */