linux-kernel - Re: [PATCH 4/5] libtraceevent: Add __rel_loc relative location attribute support

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Message-Id: <20211122140538.a981ac0bdaa1b375f9545433@kernel.org>
Date:   Mon, 22 Nov 2021 14:05:38 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Beau Belgrave <beaub@...ux.microsoft.com>,
        linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>,
        Tom Zanussi <zanussi@...nel.org>
Subject: Re: [PATCH 4/5] libtraceevent: Add __rel_loc relative location
 attribute support

Hi Steve,

On Tue, 16 Nov 2021 17:23:32 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Mon, 15 Nov 2021 19:20:36 +0900
> Masami Hiramatsu <mhiramat@...nel.org> wrote:
> 
> > Add '__rel_loc' new dynamic data location attribute which encodes
> > the data location from the next to the field itself. This is similar
> > to the '__data_loc' but the location offset is not from the event
> > entry but from the next of the field.
> > 
> > This patch adds '__rel_loc' decoding support in the libtraceevent.
> 
> Note, libtraceevent in the kernel is deprecated.

Without this patch, perf build is failed even if I installed

> 
> Care to send a patch against:
> 
>   https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/

this libtraceevent.

So it seems that the in-kernel libtraceevent source and header are
still in use.

Thank you,

-- 
Masami Hiramatsu <mhiramat@...nel.org>