netdev - Re: [PATCH v4 bpf-next 03/14] bpf: Add BTF_ID_LIST/BTF

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Date:   Sun, 28 Jun 2020 21:50:51 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Martin KaFai Lau <kafai@...com>,
        David Miller <davem@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Wenbo Zhang <ethercflow@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Andrii Nakryiko <andriin@...com>,
        Brendan Gregg <bgregg@...flix.com>,
        Florent Revest <revest@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v4 bpf-next 03/14] bpf: Add BTF_ID_LIST/BTF_ID macros

On Fri, Jun 26, 2020 at 02:32:48PM -0700, Andrii Nakryiko wrote:

SNIP

> 
> [...]
> 
> > diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h
> > new file mode 100644
> > index 000000000000..f7f9dc4d9a9f
> > --- /dev/null
> > +++ b/include/linux/btf_ids.h
> > @@ -0,0 +1,69 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +
> > +#ifndef _LINUX_BTF_IDS_H
> > +#define _LINUX_BTF_IDS_H 1
> 
> this "1", is it necessary? I think it's always just `#define HEADER_GUARD`?

I followed btf.h header:

#ifndef _LINUX_BTF_H
#define _LINUX_BTF_H 1

I don't mind changing it

> 
> > +
> > +#include <linux/compiler.h> /* for __PASTE */
> > +
> 
> [...]
> 
> > +#define __BTF_ID_LIST(name)                            \
> > +asm(                                                   \
> > +".pushsection " BTF_IDS_SECTION ",\"a\";       \n"     \
> > +".local " #name ";                             \n"     \
> > +#name ":;                                      \n"     \
> > +".popsection;                                  \n");   \
> > +
> > +#define BTF_ID_LIST(name)                              \
> > +__BTF_ID_LIST(name)                                    \
> > +extern int name[];
> 
> nit: extern u32 (or __u32) perhaps?

right, should be u32 

thanks,
jirka