selftest: ftrace: Fix to add 256 kprobe events correctly (9739cee6) · Commits · 戴 / test

Current multiple-kprobe testcase only tries to add kprobe events on first 256 text symbols. However kprobes fails to probe on some text symbols (like blacklisted symbols). Thus in the worst case, the test can not add any kprobe events. To avoid that, continue to try adding kprobe events until 256 events. Also it confirms the number of registered kprobe events. Signed-off-by:

Masami Hiramatsu <mhiramat@kernel.org> Acked-by:

Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by:

Shuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc

+17 −2

Original line number	Diff line number	Diff line
		@@ -12,9 +12,24 @@ case `uname -m` in
		*) OFFS=0;;
		esac

		echo "Setup up kprobes on first 256 text symbols"
		if [ -d events/kprobes ]; then
		echo 0 > events/kprobes/enable
		echo > kprobe_events
		fi

		N=0
		echo "Setup up kprobes on first available 256 text symbols"
		grep -i " t " /proc/kallsyms \| cut -f3 -d" " \| grep -v .\\.. \| \
		head -n 256 \| while read i; do echo p ${i}+${OFFS} ; done > kprobe_events \|\|:
		while read i; do
		echo p ${i}+${OFFS} >> kprobe_events && N=$((N+1)) \|\|:
		test $N -eq 256 && break
		done

		L=`wc -l kprobe_events`
		if [ $L -ne $N ]; then
		echo "The number of kprobes events ($L) is not $N"
		exit_fail
		fi

		echo 1 > events/kprobes/enable
		echo 0 > events/kprobes/enable

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