linux-kernel - Re: [PATCH v5 2/5] powerpc: kretprobes: override default function entry offset

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Message-Id: <20170315091559.GF20400@naverao1-tp.localdomain>
Date:   Wed, 15 Mar 2017 14:45:59 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org,
        Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>
Subject: Re: [PATCH v5 2/5] powerpc: kretprobes: override default function
 entry offset

On 2017/03/14 10:18AM, Arnaldo Carvalho de Melo wrote:
> Em Thu, Mar 09, 2017 at 05:37:38PM +1100, Michael Ellerman escreveu:
> > "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com> writes:
> > > On 2017/03/08 11:29AM, Arnaldo Carvalho de Melo wrote:
> > >> > I wasn't sure if you were planning on picking up KPROBES_ON_FTRACE for 
> > >> > v4.11. If so, it would be good to take this patch through the powerpc 
> > >> > tree. Otherwise, this can go via Ingo's tree.
> > >> 
> > >> If you guys convince Ingo that this should go _now_, then just cherry
> > >> pick what was merged into tip/perf/core that is needed for the arch
> > >> specific stuff and go from there.
> > >
> > > Ok, in hindsight, I think Michael's concern was actually for v4.12 
> > 
> > Yes I was talking about 4.12, sorry I thought that was implied :)
> > 
> > > itself, in which case this particular patch can go via powerpc tree, 
> > > while the rest of the patches in this series can go via your tree.
> > >
> > > Michael?
> > 
> > Yeah I think that's the easiest option. The function will be temporarily
> > unused until the two trees are merged, but I think that's fine.
> 
> Ok, done that, now compile testing building it in my
> multi-distro/x-build containers.

Thanks, Arnaldo!

I did however notice that you don't seem to have applied Patch 1/5 from 
this series:
https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1347858.html

That patch is needed to ensure perf continues to work when ftrace README 
advertises support for ref_reloc_sym+offset for kretprobes. Can you 
please apply that as well?

- Naveen