mainline inclusion
from mainline-5.16-rc1
commit c48e51c8
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=c48e51c8b07aba8a18125221cb67a40cb1256bf2

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

This adds selftests that tests the success and failure path for modules
kfuncs (in presence of invalid kfunc calls) for both libbpf and
gen_loader. It also adds a prog_test kfunc_btf_id_list so that we can
add module BTF ID set from bpf_testmod.

This also introduces  a couple of test cases to verifier selftests for
validating whether we get an error or not depending on if invalid kfunc
call remains after elimination of unreachable instructions.
Signed-off-by: NKumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211002011757.311265-10-memxor@gmail.com
(cherry picked from commit c48e51c8)
Signed-off-by: NWang Yufen <wangyufen@huawei.com>

Conflicts:
	include/linux/btf.h
	kernel/bpf/btf.c
	tools/testing/selftests/bpf/Makefile
	tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
Signed-off-by: NWang Yufen <wangyufen@huawei.com>