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ftrace/kprobes: selftests: Check kretprobe maxactive is supported 

Check the kretprobe maxactive is supported by kprobe_events
interface. To ensure the kernel feature, this changes ftrace
README to describe it.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
hifive-unleashed-5.1
Masami Hiramatsu 2017-05-23 15:05:50 +09:00 committed by Shuah Khan
parent 1d0864db8f
commit c3ca46ef71
2 changed files with 3 additions and 1 deletions
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3
kernel/trace/trace.c
View File

@ -4473,7 +4473,8 @@ static const char readme_msg[] =
#endif
#if defined(CONFIG_KPROBE_EVENTS) || defined(CONFIG_UPROBE_EVENTS)
"\t accepts: event-definitions (one definition per line)\n"
"\t Format: p|r[:[<group>/]<event>] <place> [<args>]\n"
"\t Format: p[:[<group>/]<event>] <place> [<args>]\n"
"\t r[maxactive][:[<group>/]<event>] <place> [<args>]\n"
"\t -:[<group>/]<event>\n"
#ifdef CONFIG_KPROBE_EVENTS
"\t place: [<module>:]<symbol>[+<offset>]|<memaddr>\n"

1
tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_maxactive.tc
View File

@ -2,6 +2,7 @@
# description: Kretprobe dynamic event with maxactive
[ -f kprobe_events ] || exit_unsupported # this is configurable
grep -q 'r\[maxactive\]' README || exit_unsupported # this is older version
echo > kprobe_events