From: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] Remove kretprobe_trampoline_holder.
Date: Wed, 30 Mar 2016 15:38:07 -0300 [thread overview]
Message-ID: <1703586.buApXYfjM8@hactar> (raw)
In-Reply-To: <1459328976.23987.4.camel@ellerman.id.au>
Am Mittwoch, 30 M=E4rz 2016, 20:09:36 schrieb Michael Ellerman:
> On Wed, 2016-03-30 at 13:34 +0530, Naveen N. Rao wrote:
> > On 2016/03/29 08:35PM, Thiago Jung Bauermann wrote:
> > > Am Dienstag, 29 M=E4rz 2016, 14:31:34 schrieb Michael Ellerman:
> > > > On Mon, 2016-03-28 at 17:06 -0300, Thiago Jung Bauermann wrote:=
> > > > > With this patch, all vmlinux symbols match /proc/kallsyms and=
the
> > > > > testcase passes.
> > > >=20
> > > > Have you tested this on an LE system?
> > >=20
> > > No, I was focusing on ppc64 BE.
> >=20
> > Which kernel did you use? I don't see this with the latest 4.6.0-rc=
1.
>=20
> Yeah I can't reproduce the perf test failure either.
I can still reproduce on 4.6.0-rc1.
> Not sure what's going on?
Try disabling CONFIG_FUNCTION_TRACER. The test failure happens when .kr=
etprobe_trampoline_holder and
kretprobe_trampoline have the same address. If that option is enabled, =
the symbols have different addresses:
$ eu-readelf -s /boot/vmlinux-4.6.0-rc1-dirty | grep kretprobe_tramp =
=20
2479: c000000000ef1d68 24 NOTYPE LOCAL DEFAULT 37 kretprob=
e_trampoline_holder
2480: c000000000043ab0 40 FUNC LOCAL DEFAULT 1 .kretpro=
be_trampoline_holder
86903: c000000000043ac4 0 NOTYPE GLOBAL DEFAULT 1 kretprob=
e_trampoline
$ grep kretprobe_tramp /proc/kallsyms
c000000000043ab0 t .kretprobe_trampoline_holder
c000000000043ac4 T kretprobe_trampoline
c000000000ef1d68 d kretprobe_trampoline_holder
--=20
[]'s
Thiago Jung Bauermann
IBM Linux Technology Center
next prev parent reply other threads:[~2016-03-30 18:39 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-24 17:17 [PATCH] Make kretprobe_trampoline symbol look like a function Thiago Jung Bauermann
2016-03-25 8:24 ` Michael Ellerman
2016-03-28 20:06 ` [PATCH] Remove kretprobe_trampoline_holder Thiago Jung Bauermann
2016-03-28 20:29 ` Thiago Jung Bauermann
2016-03-28 23:45 ` Michael Ellerman
2016-03-29 18:34 ` Thiago Jung Bauermann
2016-03-30 0:09 ` Michael Ellerman
2016-03-29 3:31 ` Michael Ellerman
2016-03-29 23:35 ` Thiago Jung Bauermann
2016-03-30 8:04 ` Naveen N. Rao
2016-03-30 8:46 ` Naveen N. Rao
2016-03-30 9:09 ` Michael Ellerman
2016-03-30 18:38 ` Thiago Jung Bauermann [this message]
2016-03-31 8:23 ` Naveen N. Rao
2016-03-31 20:16 ` Thiago Jung Bauermann
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