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From: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] Remove kretprobe_trampoline_holder.
Date: Mon, 28 Mar 2016 17:29:41 -0300
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Am Montag, 28 M=E4rz 2016, 17:06:32 schrieb Thiago Jung Bauermann:
> /home/bauermann/src/linux/tools/testing/selftests/ftrace/test.d/kprob=
e/kp
> robe_ftrace.tc: line 9: echo: write error: Invalid argument
>=20
>     But even without my patch that testcase fails in the same way, so=
 this
> is not a problem introduced by the patch.

That failure is on this line of kprobe_ftrace.tc:

echo _do_fork > set_ftrace_filter

This fails because on powerpc the function symbol has a dot prepended t=
o its=20
name:

# cat available_filter_functions | grep _do_fork
._do_fork

If I do s/_do_fork/._do_fork/ in kprobe_ftrace.tc then all ftrace kprob=
e=20
tests pass:

$ sudo ./ftracetest test.d/kprobe/
=3D=3D=3D Ftrace unit tests =3D=3D=3D
[1] Kprobe dynamic event - adding and removing  [PASS]
[2] Kprobe dynamic event - busy event check     [PASS]
[3] Kprobe dynamic event with arguments [PASS]
[4] Kprobe dynamic event with function tracer   [PASS]
[5] Kretprobe dynamic event with arguments      [PASS]

# of passed:  5
# of failed:  0
# of unresolved:  0
# of untested:  0
# of unsupported:  0
# of xfailed:  0
# of undefined(test bug):  0

--=20
[]'s
Thiago Jung Bauermann
IBM Linux Technology Center