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tracing: Add __string_len() example 

[ Upstream commit dd6ae6d90a ]

There's no example code that uses __string_len(), and since the sample
code is used for testing the event logic, add a use case.

Link: https://lore.kernel.org/linux-trace-kernel/20240223152827.5f9f78e2@gandalf.local.home

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Stable-dep-of: ea8d7647f9 ("tracing: Verify event formats that have "%*p.."")
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 896e30f76840c9cc196927ee69109745fb23d499)
This commit is contained in:
Steven Rostedt (Google) 2024-02-23 15:28:27 -05:00 committed by Wentao Guan
parent 9db193589f
commit 683a756bb1
1 changed files with 5 additions and 2 deletions
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7
samples/trace_events/trace-events-sample.h
View File

@ -302,6 +302,7 @@ TRACE_EVENT(foo_bar,
__bitmask( cpus, num_possible_cpus() )
__cpumask( cpum )
__vstring( vstr, fmt, va )
__string_len( lstr, foo, bar / 2 < strlen(foo) ? bar / 2 : strlen(foo) )
),
TP_fast_assign(
@ -310,12 +311,13 @@ TRACE_EVENT(foo_bar,
memcpy(__get_dynamic_array(list), lst,
__length_of(lst) * sizeof(int));
__assign_str(str, string);
__assign_str(lstr, foo);
__assign_vstr(vstr, fmt, va);
__assign_bitmask(cpus, cpumask_bits(mask), num_possible_cpus());
__assign_cpumask(cpum, cpumask_bits(mask));
),
TP_printk("foo %s %d %s %s %s %s (%s) (%s) %s", __entry->foo, __entry->bar,
TP_printk("foo %s %d %s %s %s %s %s (%s) (%s) %s", __entry->foo, __entry->bar,
/*
* Notice here the use of some helper functions. This includes:
@ -359,7 +361,8 @@ TRACE_EVENT(foo_bar,
__print_array(__get_dynamic_array(list),
__get_dynamic_array_len(list) / sizeof(int),
sizeof(int)),
__get_str(str), __get_bitmask(cpus), __get_cpumask(cpum),
__get_str(str), __get_str(lstr),
__get_bitmask(cpus), __get_cpumask(cpum),
__get_str(vstr))
);