mainline inclusion
from mainline-5.13-rc1
commit 34747c41
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=34747c4120418143097d4343312a0ca96c986d86

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

This patch moved the subprog specific logic from
btf_check_func_arg_match() to the new btf_check_subprog_arg_match().
The core logic is left in btf_check_func_arg_match() which
will be reused later to check the kernel function call.

The "if (!btf_type_is_ptr(t))" is checked first to improve the
indentation which will be useful for a later patch.

Some of the "btf_kind_str[]" usages is replaced with the shortcut
"btf_type_str(t)".
Signed-off-by: NMartin KaFai Lau <kafai@fb.com>
Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210325015136.1544504-1-kafai@fb.com
(cherry picked from commit 34747c41)
Signed-off-by: NWang Yufen <wangyufen@huawei.com>

Conflicts:
	kernel/bpf/btf.c
Signed-off-by: NWang Yufen <wangyufen@huawei.com>