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tracing: Add trace_printk sample code

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Add sample code to test trace_printk(). The trace_printk() functions should
never be used in production code. This makes testing it a bit more
difficult. Having a sample module that can test use cases of trace_printk()
can help out.

Currently it just tests trace_printk() where it will be converted into:

 trace_bputs()
 trace_puts()
 trace_bprintk()

as well as staying as the normal _trace_printk().

It also tests its use in interrupt context as that will test the auxilery
buffers.

Signed-off-by: Steven Rostedt <[email protected]>
This commit is contained in:
Steven Rostedt (Red Hat) 2016-06-17 14:50:23 -04:00 • committed by Steven Rostedt
commit aad108aa9d
4 changed files with 70 additions and 1 deletions
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7
samples/Kconfig
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@ -11,6 +11,13 @@ config SAMPLE_TRACE_EVENTS
help
This build trace event example modules.
config SAMPLE_TRACE_PRINTK
tristate "Build trace_printk module - tests various trace_printk formats"
depends on EVENT_TRACING && m
help
This builds a module that calls trace_printk() and can be used to
test various trace_printk() calls from a module.
config SAMPLE_KOBJECT
tristate "Build kobject examples -- loadable modules only"
depends on m