From 9739cee6918b222af6f75869ed33127a8b1c3d77 Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Sun, 14 Jan 2018 22:50:36 +0900 Subject: selftest: ftrace: Fix to add 256 kprobe events correctly 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 Acked-by: Steven Rostedt (VMware) Signed-off-by: Shuah Khan --- .../ftrace/test.d/kprobe/multiple_kprobes.tc | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) (limited to 'tools') diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc b/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc index e297bd7a2e79..ce361b9d62cf 100644 --- a/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc +++ b/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc @@ -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 -- cgit v1.2.3-59-g8ed1b