From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Andrii Nakryiko <andrii.nakryiko@gmail.com>,
Jiri Olsa <jolsa@kernel.org>,
dwarves@vger.kernel.org, bpf <bpf@vger.kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andriin@fb.com>, Yonghong Song <yhs@fb.com>,
Hao Luo <haoluo@google.com>
Subject: Re: [PATCH 2/3] btf_encoder: Use address size based on ELF's class
Date: Mon, 7 Dec 2020 12:45:20 -0300 [thread overview]
Message-ID: <20201207154520.GA125383@kernel.org> (raw)
In-Reply-To: <20201203233750.GG3613628@krava>
Em Fri, Dec 04, 2020 at 12:37:50AM +0100, Jiri Olsa escreveu:
> On Thu, Dec 03, 2020 at 03:22:18PM -0800, Andrii Nakryiko wrote:
> > On Thu, Dec 3, 2020 at 2:08 PM Jiri Olsa <jolsa@kernel.org> wrote:
> > >
> > > We can't assume the address size is always size of unsigned
> > > long, we have to use directly the ELF's address size.
> > >
> > > Changing addrs array to __u64 and convert 32 bit address
> > > values when copying from ELF section.
> > >
> > > Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> > > ---
> >
> > It looks ok to me, but I didn't expect that changes would be so
> > numerous... Makes me wonder if pahole ever supported working with ELF
> > files of different bitness. I'll defer to Arnaldo to make a call on
> > whether this is necessary.
>
> so to test this I built 32bit vmlinux and used 64bit pahole
> to generate BTF data on both vmlinux and modules, which I
> thought was valid use case
It is valid, yeah.
- Arnaldo
> jirka
>
> >
> > > btf_encoder.c | 24 +++++++++++++++++-------
> > > 1 file changed, 17 insertions(+), 7 deletions(-)
> > >
> >
> > [...]
> >
>
--
- Arnaldo
next prev parent reply other threads:[~2020-12-07 15:45 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-03 22:06 [PATCHv2 0/3] btf_encoder: Detect kernel modules Jiri Olsa
2020-12-03 22:06 ` [PATCH 1/3] btf_encoder: Factor filter_functions function Jiri Olsa
2020-12-03 23:20 ` Andrii Nakryiko
2020-12-03 22:06 ` [PATCH 2/3] btf_encoder: Use address size based on ELF's class Jiri Olsa
2020-12-03 23:22 ` Andrii Nakryiko
2020-12-03 23:37 ` Jiri Olsa
2020-12-07 15:45 ` Arnaldo Carvalho de Melo [this message]
2020-12-03 22:06 ` [PATCH 3/3] btf_encoder: Detect kernel module ftrace addresses Jiri Olsa
2020-12-03 23:23 ` Andrii Nakryiko
2020-12-07 15:54 ` Arnaldo Carvalho de Melo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201207154520.GA125383@kernel.org \
--to=acme@kernel.org \
--cc=andrii.nakryiko@gmail.com \
--cc=andriin@fb.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=dwarves@vger.kernel.org \
--cc=haoluo@google.com \
--cc=jolsa@kernel.org \
--cc=jolsa@redhat.com \
--cc=yhs@fb.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).