linux-kernel - Re: [PATCH perf/core] perf-probe: Fix to get correct modname from elf header

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Message-ID: <20170102170940.GD21178@kernel.org>
Date:   Mon, 2 Jan 2017 14:09:40 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH perf/core] perf-probe: Fix to get correct modname from
 elf header

Em Tue, Jan 03, 2017 at 12:20:49AM +0900, Masami Hiramatsu escreveu:
> Since perf-probe supports cross-arch probe, it is possible to
> analyze different arch kernel image which has different
> bits-per-long. In that case, it fails to get module name
> because perf probe uses MOD_NAME_OFFSET macro based on
> host machines bits-per-long, instead of the target archs
> bits-per-long.
> 
> This fixes above issue by changing modname-offset based on
> the target archs bitwidth. This is ok because linux kernel
> uses LP64 model on 64bit arch.

Seems simple enough, thanks, applied.

- Arnaldo