mainline inclusion
from mainline-5.13-rc1
commit e14ef4bf
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5EUVD
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e14ef4bf011192b61b48c4f3a35b3041140073ff

-------------------------------------------------

btf_type_by_id() is internal-only convenience API returning non-const pointer
to struct btf_type. Expose it outside of btf.c for re-use.
Signed-off-by: NAndrii Nakryiko <andrii@kernel.org>
Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210318194036.3521577-2-andrii@kernel.org
(cherry picked from commit e14ef4bf)
Signed-off-by: NWang Yufen <wangyufen@huawei.com>