On Wed, Jan 15, 2025 at 2:00 AM Pu Lehui <pulehui@xxxxxxxxxxxxxxx> wrote: > > From: Pu Lehui <pulehui@xxxxxxxxxx> > > When redirecting the split BTF to the vmlinux base BTF, we need to mark > the distilled base struct/union members of split BTF structs/unions in > id_map with BTF_IS_EMBEDDED. This indicates that these types must match > both name and size later. So if a needed composite type, which is the > member of composite type in the split BTF, has a different size in the > base BTF we wish to relocate with, btf__relocate() should error out. > > Signed-off-by: Pu Lehui <pulehui@xxxxxxxxxx> > --- > v2: Add test about marking BTF_IS_EMBEDDED. > > .../selftests/bpf/prog_tests/btf_distill.c | 72 +++++++++++++++++++ > 1 file changed, 72 insertions(+) > Nice test, thanks! Applied the series to bpf-next. > diff --git a/tools/testing/selftests/bpf/prog_tests/btf_distill.c b/tools/testing/selftests/bpf/prog_tests/btf_distill.c > index b72b966df77b..fb67ae195a73 100644 > --- a/tools/testing/selftests/bpf/prog_tests/btf_distill.c > +++ b/tools/testing/selftests/bpf/prog_tests/btf_distill.c > @@ -601,6 +601,76 @@ static void test_distilled_endianness(void) > btf__free(base); > } > [...]
