Re: [PATCH] selftests/ftrace: Use $FUNCTION_FORK to reference kernel fork function

From: Masami Hiramatsu
Date: Tue Oct 27 2020 - 09:38:40 EST

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In reply to: Steven Rostedt: "[PATCH] selftests/ftrace: Use $FUNCTION_FORK to reference kernel fork function"
Next in thread: Steven Rostedt: "Re: [PATCH] selftests/ftrace: Use $FUNCTION_FORK to reference kernel fork function"
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On Mon, 26 Oct 2020 16:20:32 -0400
Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx>
>
> Commit cad6967ac108 ("fork: introduce kernel_clone()") replaced "_do_fork()"
> with "kernel_clone()". The ftrace selftests reference the fork function in
> several of the tests. The rename will make the tests break, but if those
> names are changed in the tests, they would then break on older kernels. The
> same set of tests should pass older kernels if they have previously passed.
> Obviously, a new test may not work on older kernels if the test was added
> due to a bug or a new feature.
>
> The setup of ftracetest will now create a $FUNCTION_FORK bash variable
> that will contain "_do_fork" for older kernels and "kernel_clone" for newer
> ones. It figures out the proper name by examining /proc/kallsyms.
>
> Note, available_filter_functions could also be used, but because some tests
> should be able to pass without function tracing enabled, it could not be
> used.

Agreed, for the generic use, we need to check /proc/kallsyms.

>
> Fixes: eea11285dab3 ("tracing: switch to kernel_clone()")
> Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>

This looks good to me.

Acked-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>

Thank you!

> ---
> .../ftrace/test.d/dynevent/add_remove_kprobe.tc | 2 +-
> .../ftrace/test.d/dynevent/clear_select_events.tc | 2 +-
> .../ftrace/test.d/dynevent/generic_clear_event.tc | 2 +-
> .../test.d/ftrace/func-filter-notrace-pid.tc | 2 +-
> .../ftrace/test.d/ftrace/func-filter-pid.tc | 2 +-
> .../ftrace/test.d/ftrace/func-filter-stacktrace.tc | 4 ++--
> tools/testing/selftests/ftrace/test.d/functions | 7 +++++++
> .../ftrace/test.d/kprobe/add_and_remove.tc | 2 +-
> .../selftests/ftrace/test.d/kprobe/busy_check.tc | 2 +-
> .../selftests/ftrace/test.d/kprobe/kprobe_args.tc | 4 ++--
> .../ftrace/test.d/kprobe/kprobe_args_comm.tc | 2 +-
> .../ftrace/test.d/kprobe/kprobe_args_string.tc | 4 ++--
> .../ftrace/test.d/kprobe/kprobe_args_symbol.tc | 10 +++++-----
> .../ftrace/test.d/kprobe/kprobe_args_type.tc | 2 +-
> .../ftrace/test.d/kprobe/kprobe_ftrace.tc | 14 +++++++-------
> .../ftrace/test.d/kprobe/kprobe_multiprobe.tc | 2 +-
> .../ftrace/test.d/kprobe/kprobe_syntax_errors.tc | 12 ++++++------
> .../ftrace/test.d/kprobe/kretprobe_args.tc | 4 ++--
> .../selftests/ftrace/test.d/kprobe/profile.tc | 2 +-
> 19 files changed, 44 insertions(+), 37 deletions(-)
>
> diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_kprobe.tc b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_kprobe.tc
> index 3bcd4c3624ee..b4da41d126d5 100644
> --- a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_kprobe.tc
> +++ b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_kprobe.tc
> @@ -6,7 +6,7 @@
> echo 0 > events/enable
> echo > dynamic_events
>
> -PLACE=kernel_clone
> +PLACE=$FUNCTION_FORK
>
> echo "p:myevent1 $PLACE" >> dynamic_events
> echo "r:myevent2 $PLACE" >> dynamic_events
> diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/clear_select_events.tc b/tools/testing/selftests/ftrace/test.d/dynevent/clear_select_events.tc
> index 438961971b7e..3a0e2885fff5 100644
> --- a/tools/testing/selftests/ftrace/test.d/dynevent/clear_select_events.tc
> +++ b/tools/testing/selftests/ftrace/test.d/dynevent/clear_select_events.tc
> @@ -6,7 +6,7 @@
> echo 0 > events/enable
> echo > dynamic_events
>
> -PLACE=kernel_clone
> +PLACE=$FUNCTION_FORK
>
> setup_events() {
> echo "p:myevent1 $PLACE" >> dynamic_events
> diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/generic_clear_event.tc b/tools/testing/selftests/ftrace/test.d/dynevent/generic_clear_event.tc
> index a8603bd23e0d..d3e138e8377f 100644
> --- a/tools/testing/selftests/ftrace/test.d/dynevent/generic_clear_event.tc
> +++ b/tools/testing/selftests/ftrace/test.d/dynevent/generic_clear_event.tc
> @@ -6,7 +6,7 @@
> echo 0 > events/enable
> echo > dynamic_events
>
> -PLACE=kernel_clone
> +PLACE=$FUNCTION_FORK
>
> setup_events() {
> echo "p:myevent1 $PLACE" >> dynamic_events
> diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-notrace-pid.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-notrace-pid.tc
> index acb17ce543d2..80541964b927 100644
> --- a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-notrace-pid.tc
> +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-notrace-pid.tc
> @@ -39,7 +39,7 @@ do_test() {
> disable_tracing
>
> echo do_execve* > set_ftrace_filter
> - echo *do_fork >> set_ftrace_filter
> + echo $FUNCTION_FORK >> set_ftrace_filter
>
> echo $PID > set_ftrace_notrace_pid
> echo function > current_tracer
> diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc
> index 9f0a9687c773..2f7211254529 100644
> --- a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc
> +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc
> @@ -39,7 +39,7 @@ do_test() {
> disable_tracing
>
> echo do_execve* > set_ftrace_filter
> - echo *do_fork >> set_ftrace_filter
> + echo $FUNCTION_FORK >> set_ftrace_filter
>
> echo $PID > set_ftrace_pid
> echo function > current_tracer
> diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc
> index 98305d76bd04..191d116b7883 100644
> --- a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc
> +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc
> @@ -4,9 +4,9 @@
> # requires: set_ftrace_filter
> # flags: instance
>
> -echo kernel_clone:stacktrace >> set_ftrace_filter
> +echo $FUNCTION_FORK:stacktrace >> set_ftrace_filter
>
> -grep -q "kernel_clone:stacktrace:unlimited" set_ftrace_filter
> +grep -q "$FUNCTION_FORK:stacktrace:unlimited" set_ftrace_filter
>
> (echo "forked"; sleep 1)
>
> diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions
> index c5dec55b7d95..a6fac927ee82 100644
> --- a/tools/testing/selftests/ftrace/test.d/functions
> +++ b/tools/testing/selftests/ftrace/test.d/functions
> @@ -133,6 +133,13 @@ yield() {
> ping $LOCALHOST -c 1 || sleep .001 || usleep 1 || sleep 1
> }
>
> +# The fork function in the kernel was renamed from "_do_fork" to
> +# "kernel_fork". As older tests should still work with older kernels
> +# as well as newer kernels, check which version of fork is used on this
> +# kernel so that the tests can use the fork function for the running kernel.
> +FUNCTION_FORK=`(if grep '\bkernel_clone\b' /proc/kallsyms > /dev/null; then
> + echo kernel_clone; else echo '_do_fork'; fi)`
> +
> # Since probe event command may include backslash, explicitly use printf "%s"
> # to NOT interpret it.
> ftrace_errlog_check() { # err-prefix command-with-error-pos-by-^ command-file
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc b/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc
> index 9737cd0578a7..2428a3ed78c9 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc
> @@ -3,7 +3,7 @@
> # description: Kprobe dynamic event - adding and removing
> # requires: kprobe_events
>
> -echo p:myevent kernel_clone > kprobe_events
> +echo p:myevent $FUNCTION_FORK > kprobe_events
> grep myevent kprobe_events
> test -d events/kprobes/myevent
> echo > kprobe_events
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc b/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc
> index f9a40af76888..010a8b1d6c1d 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc
> @@ -3,7 +3,7 @@
> # description: Kprobe dynamic event - busy event check
> # requires: kprobe_events
>
> -echo p:myevent kernel_clone > kprobe_events
> +echo p:myevent $FUNCTION_FORK > kprobe_events
> test -d events/kprobes/myevent
> echo 1 > events/kprobes/myevent/enable
> echo > kprobe_events && exit_fail # this must fail
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc
> index eb543d3cfe5f..a96a1dc7014f 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc
> @@ -3,13 +3,13 @@
> # description: Kprobe dynamic event with arguments
> # requires: kprobe_events
>
> -echo 'p:testprobe kernel_clone $stack $stack0 +0($stack)' > kprobe_events
> +echo "p:testprobe $FUNCTION_FORK \$stack \$stack0 +0(\$stack)" > kprobe_events
> grep testprobe kprobe_events | grep -q 'arg1=\$stack arg2=\$stack0 arg3=+0(\$stack)'
> test -d events/kprobes/testprobe
>
> echo 1 > events/kprobes/testprobe/enable
> ( echo "forked")
> -grep testprobe trace | grep 'kernel_clone' | \
> +grep testprobe trace | grep "$FUNCTION_FORK" | \
> grep -q 'arg1=0x[[:xdigit:]]* arg2=0x[[:xdigit:]]* arg3=0x[[:xdigit:]]*$'
>
> echo 0 > events/kprobes/testprobe/enable
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_comm.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_comm.tc
> index 4e5b63be51c9..a053ee2e7d77 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_comm.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_comm.tc
> @@ -5,7 +5,7 @@
>
> grep -A1 "fetcharg:" README | grep -q "\$comm" || exit_unsupported # this is too old
>
> -echo 'p:testprobe kernel_clone comm=$comm ' > kprobe_events
> +echo "p:testprobe $FUNCTION_FORK comm=\$comm " > kprobe_events
> grep testprobe kprobe_events | grep -q 'comm=$comm'
> test -d events/kprobes/testprobe
>
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
> index a1d70588ab21..84285a6f60b0 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
> @@ -30,13 +30,13 @@ esac
> : "Test get argument (1)"
> echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):string" > kprobe_events
> echo 1 > events/kprobes/testprobe/enable
> -echo "p:test kernel_clone" >> kprobe_events
> +echo "p:test $FUNCTION_FORK" >> kprobe_events
> grep -qe "testprobe.* arg1=\"test\"" trace
>
> echo 0 > events/kprobes/testprobe/enable
> : "Test get argument (2)"
> echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):string arg2=+0(${ARG1}):string" > kprobe_events
> echo 1 > events/kprobes/testprobe/enable
> -echo "p:test kernel_clone" >> kprobe_events
> +echo "p:test $FUNCTION_FORK" >> kprobe_events
> grep -qe "testprobe.* arg1=\"test\" arg2=\"test\"" trace
>
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc
> index bd25dd0ba0d0..717130ed4feb 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc
> @@ -14,12 +14,12 @@ elif ! grep "$SYMBOL\$" /proc/kallsyms; then
> fi
>
> : "Test get basic types symbol argument"
> -echo "p:testprobe_u kernel_clone arg1=@linux_proc_banner:u64 arg2=@linux_proc_banner:u32 arg3=@linux_proc_banner:u16 arg4=@linux_proc_banner:u8" > kprobe_events
> -echo "p:testprobe_s kernel_clone arg1=@linux_proc_banner:s64 arg2=@linux_proc_banner:s32 arg3=@linux_proc_banner:s16 arg4=@linux_proc_banner:s8" >> kprobe_events
> +echo "p:testprobe_u $FUNCTION_FORK arg1=@linux_proc_banner:u64 arg2=@linux_proc_banner:u32 arg3=@linux_proc_banner:u16 arg4=@linux_proc_banner:u8" > kprobe_events
> +echo "p:testprobe_s $FUNCTION_FORK arg1=@linux_proc_banner:s64 arg2=@linux_proc_banner:s32 arg3=@linux_proc_banner:s16 arg4=@linux_proc_banner:s8" >> kprobe_events
> if grep -q "x8/16/32/64" README; then
> - echo "p:testprobe_x kernel_clone arg1=@linux_proc_banner:x64 arg2=@linux_proc_banner:x32 arg3=@linux_proc_banner:x16 arg4=@linux_proc_banner:x8" >> kprobe_events
> + echo "p:testprobe_x $FUNCTION_FORK arg1=@linux_proc_banner:x64 arg2=@linux_proc_banner:x32 arg3=@linux_proc_banner:x16 arg4=@linux_proc_banner:x8" >> kprobe_events
> fi
> -echo "p:testprobe_bf kernel_clone arg1=@linux_proc_banner:b8@4/32" >> kprobe_events
> +echo "p:testprobe_bf $FUNCTION_FORK arg1=@linux_proc_banner:b8@4/32" >> kprobe_events
> echo 1 > events/kprobes/enable
> (echo "forked")
> echo 0 > events/kprobes/enable
> @@ -27,7 +27,7 @@ grep "testprobe_[usx]:.* arg1=.* arg2=.* arg3=.* arg4=.*" trace
> grep "testprobe_bf:.* arg1=.*" trace
>
> : "Test get string symbol argument"
> -echo "p:testprobe_str kernel_clone arg1=@linux_proc_banner:string" > kprobe_events
> +echo "p:testprobe_str $FUNCTION_FORK arg1=@linux_proc_banner:string" > kprobe_events
> echo 1 > events/kprobes/enable
> (echo "forked")
> echo 0 > events/kprobes/enable
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
> index 91fcce1c241c..25b7708eb559 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
> @@ -4,7 +4,7 @@
> # requires: kprobe_events "x8/16/32/64":README
>
> gen_event() { # Bitsize
> - echo "p:testprobe kernel_clone \$stack0:s$1 \$stack0:u$1 \$stack0:x$1 \$stack0:b4@4/$1"
> + echo "p:testprobe $FUNCTION_FORK \$stack0:s$1 \$stack0:u$1 \$stack0:x$1 \$stack0:b4@4/$1"
> }
>
> check_types() { # s-type u-type x-type bf-type width
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
> index 0d179094191f..5556292601a4 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
> @@ -5,29 +5,29 @@
>
> # prepare
> echo nop > current_tracer
> -echo kernel_clone > set_ftrace_filter
> -echo 'p:testprobe kernel_clone' > kprobe_events
> +echo $FUNCTION_FORK > set_ftrace_filter
> +echo "p:testprobe $FUNCTION_FORK" > kprobe_events
>
> # kprobe on / ftrace off
> echo 1 > events/kprobes/testprobe/enable
> echo > trace
> ( echo "forked")
> grep testprobe trace
> -! grep 'kernel_clone <-' trace
> +! grep "$FUNCTION_FORK <-" trace
>
> # kprobe on / ftrace on
> echo function > current_tracer
> echo > trace
> ( echo "forked")
> grep testprobe trace
> -grep 'kernel_clone <-' trace
> +grep "$FUNCTION_FORK <-" trace
>
> # kprobe off / ftrace on
> echo 0 > events/kprobes/testprobe/enable
> echo > trace
> ( echo "forked")
> ! grep testprobe trace
> -grep 'kernel_clone <-' trace
> +grep "$FUNCTION_FORK <-" trace
>
> # kprobe on / ftrace on
> echo 1 > events/kprobes/testprobe/enable
> @@ -35,11 +35,11 @@ echo function > current_tracer
> echo > trace
> ( echo "forked")
> grep testprobe trace
> -grep 'kernel_clone <-' trace
> +grep "$FUNCTION_FORK <-" trace
>
> # kprobe on / ftrace off
> echo nop > current_tracer
> echo > trace
> ( echo "forked")
> grep testprobe trace
> -! grep 'kernel_clone <-' trace
> +! grep "$FUNCTION_FORK <-" trace
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_multiprobe.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_multiprobe.tc
> index 45d90b6c763d..f0d5b7777ed7 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_multiprobe.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_multiprobe.tc
> @@ -4,7 +4,7 @@
> # requires: kprobe_events "Create/append/":README
>
> # Choose 2 symbols for target
> -SYM1=kernel_clone
> +SYM1=$FUNCTION_FORK
> SYM2=do_exit
> EVENT_NAME=kprobes/testevent
>
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
> index 1b5550ef8a9b..fa928b431555 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
> @@ -86,15 +86,15 @@ esac
>
> # multiprobe errors
> if grep -q "Create/append/" README && grep -q "imm-value" README; then
> -echo 'p:kprobes/testevent kernel_clone' > kprobe_events
> +echo "p:kprobes/testevent $FUNCTION_FORK" > kprobe_events
> check_error '^r:kprobes/testevent do_exit' # DIFF_PROBE_TYPE
>
> # Explicitly use printf "%s" to not interpret \1
> -printf "%s" 'p:kprobes/testevent kernel_clone abcd=\1' > kprobe_events
> -check_error 'p:kprobes/testevent kernel_clone ^bcd=\1' # DIFF_ARG_TYPE
> -check_error 'p:kprobes/testevent kernel_clone ^abcd=\1:u8' # DIFF_ARG_TYPE
> -check_error 'p:kprobes/testevent kernel_clone ^abcd=\"foo"' # DIFF_ARG_TYPE
> -check_error '^p:kprobes/testevent kernel_clone abcd=\1' # SAME_PROBE
> +printf "%s" "p:kprobes/testevent $FUNCTION_FORK abcd=\\1" > kprobe_events
> +check_error "p:kprobes/testevent $FUNCTION_FORK ^bcd=\\1" # DIFF_ARG_TYPE
> +check_error "p:kprobes/testevent $FUNCTION_FORK ^abcd=\\1:u8" # DIFF_ARG_TYPE
> +check_error "p:kprobes/testevent $FUNCTION_FORK ^abcd=\\\"foo\"" # DIFF_ARG_TYPE
> +check_error "^p:kprobes/testevent $FUNCTION_FORK abcd=\\1" # SAME_PROBE
> fi
>
> # %return suffix errors
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc
> index 7ae492c204a4..197cc2afd404 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc
> @@ -4,14 +4,14 @@
> # requires: kprobe_events
>
> # Add new kretprobe event
> -echo 'r:testprobe2 kernel_clone $retval' > kprobe_events
> +echo "r:testprobe2 $FUNCTION_FORK \$retval" > kprobe_events
> grep testprobe2 kprobe_events | grep -q 'arg1=\$retval'
> test -d events/kprobes/testprobe2
>
> echo 1 > events/kprobes/testprobe2/enable
> ( echo "forked")
>
> -cat trace | grep testprobe2 | grep -q '<- kernel_clone'
> +cat trace | grep testprobe2 | grep -q "<- $FUNCTION_FORK"
>
> echo 0 > events/kprobes/testprobe2/enable
> echo '-:testprobe2' >> kprobe_events
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/profile.tc b/tools/testing/selftests/ftrace/test.d/kprobe/profile.tc
> index c4093fc1a773..98166fa3eb91 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/profile.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/profile.tc
> @@ -4,7 +4,7 @@
> # requires: kprobe_events
>
> ! grep -q 'myevent' kprobe_profile
> -echo p:myevent kernel_clone > kprobe_events
> +echo "p:myevent $FUNCTION_FORK" > kprobe_events
> grep -q 'myevent[[:space:]]*0[[:space:]]*0$' kprobe_profile
> echo 1 > events/kprobes/myevent/enable
> ( echo "forked" )
> --
> 2.25.4
>

--
Masami Hiramatsu <mhiramat@xxxxxxxxxx>

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