linux-kernel - Re: [PATCH 1/1] perf bpf: Check that the minimal vmlinux.h installed is the latest one

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Date: Sat, 24 Feb 2024 11:18:58 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>, Stephen Rothwell <sfr@...b.auug.org.au>, 
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/1] perf bpf: Check that the minimal vmlinux.h installed
 is the latest one

On Sat, Feb 24, 2024 at 7:57 AM Ian Rogers <irogers@...gle.com> wrote:
>
> On Sat, Feb 24, 2024 at 7:48 AM Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
> >
> > When building BPF skels perf will, by default, install a minimalistic
> > vmlinux.h file with the types needed by the BPF skels in
> > tools/perf/util/bpf_skel/ in its build directory.
> >
> > When 29d16de26df17e94 ("perf augmented_raw_syscalls.bpf: Move 'struct
> > timespec64' to vmlinux.h") was added, a type used in the augmented_raw_syscalls
> > BPF skel, 'struct timespec64' was not found when building from a pre-existing
> > build directory, because the vmlinux.h there didn't contain that type,
> > ending up with this error, spotted in linux-next:
> >
> >     CLANG   /tmp/build/perf-tools-next/util/bpf_skel/.tmp/augmented_raw_syscalls.bpf.o
> >   util/bpf_skel/augmented_raw_syscalls.bpf.c:329:15: error: invalid application of 'sizeof' to an incomplete type 'struct timespec64'
> >     329 |         __u32 size = sizeof(struct timespec64);
> >         |                      ^     ~~~~~~~~~~~~~~~~~~~
> >   util/bpf_skel/augmented_raw_syscalls.bpf.c:329:29: note: forward declaration of 'struct timespec64'
> >     329 |         __u32 size = sizeof(struct timespec64);
> >         |                                    ^
> >   util/bpf_skel/augmented_raw_syscalls.bpf.c:350:15: error: invalid application of 'sizeof' to an incomplete type 'struct timespec64'
> >     350 |         __u32 size = sizeof(struct timespec64);
> >         |                      ^     ~~~~~~~~~~~~~~~~~~~
> >   util/bpf_skel/augmented_raw_syscalls.bpf.c:350:29: note: forward declaration of 'struct timespec64'
> >     350 |         __u32 size = sizeof(struct timespec64);
> >         |                                    ^
> >   2 errors generated.
> >   make[2]: *** [Makefile.perf:1158: /tmp/build/perf-tools-next/util/bpf_skel/.tmp/augmented_raw_syscalls.bpf.o] Error 1
> >   make[2]: *** Waiting for unfinished jobs....
> >   make[1]: *** [Makefile.perf:261: sub-make] Error 2
> >   make: *** [Makefile:113: install-bin] Error 2
> >   make: Leaving directory '/home/acme/git/perf-tools-next/tools/perf'
> >
> > So add a Makefile dependency (Namhyung's suggestion) to make sure that
> > the new tools/perf/util/bpf_skel/vmlinux/vmlinux.h minimal vmlinux is
> > updated in the build directory, providing the moved 'struct timespec64'
> > type.
> >
> > Fixes: 29d16de26df17e94 ("perf augmented_raw_syscalls.bpf: Move 'struct timespec64' to vmlinux.h")
> > Cc: Ian Rogers <irogers@...gle.com>
> > Cc: Namhyung Kim <namhyung@...nel.org>
> > Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > Link: https://lore.kernel.org/lkml/CAM9d7ciaj80QZL0AS_T2HNBdMOyS-j1wBHQSYs=U3kHQimY1mQ@mail.gmail.com
> > Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
>
> Reviewed-by: Ian Rogers <irogers@...gle.com>

Suggested-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung