linux-kernel - Re: [PATCH 1/1] perf augmented_raw_syscalls.bpf: Move 'struct timespec64' to vmlinux.h

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Date: Mon, 5 Feb 2024 15:16:25 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>, Ian Rogers <irogers@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] perf augmented_raw_syscalls.bpf: Move 'struct
 timespec64' to vmlinux.h

On Fri, Feb 2, 2024 at 6:01 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> On Fri, Feb 2, 2024 at 11:35 AM Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
> >
> > If we instead decide to generate vmlinux.h from BTF info, it will be
> > there:
> >
> >   $ pahole timespec64
> >   struct timespec64 {
> >         time64_t                   tv_sec;               /*     0     8 */
> >         long int                   tv_nsec;              /*     8     8 */
> >
> >         /* size: 16, cachelines: 1, members: 2 */
> >         /* last cacheline: 16 bytes */
> >   };
> >
> >   $
> >
> > pahole manages to find it from /sys/kernel/btf/vmlinux, that is
> > generated from the kernel types.
> >
> > Cc: Adrian Hunter <adrian.hunter@...el.com>
> > Cc: Ian Rogers <irogers@...gle.com>
> > Cc: Jiri Olsa <jolsa@...nel.org>
> > Cc: Namhyung Kim <namhyung@...nel.org>
> > Link: https://lore.kernel.org/lkml/
> > Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
>
> Acked-by: Namhyung Kim <namhyung@...nel.org>

Hmm.. but it makes it fail to build with GEN_VMLINUX_H=1.

Thanks,
Namhyung


  CLANG   linux/tools/perf/util/bpf_skel/.tmp/augmented_raw_syscalls.bpf.o
In file included from util/bpf_skel/augmented_raw_syscalls.bpf.c:10:
linux/tools/include/uapi/linux/bpf.h:55:2: error: redefinition of
enumerator 'BPF_REG_0'
        BPF_REG_0 = 0,
        ^
linux/tools/perf/util/bpf_skel/.tmp/../vmlinux.h:46833:2: note:
previous definition is here
        BPF_REG_0 = 0,
        ^