mainline inclusion
from mainline-5.14-rc1
commit af2ac3e1
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=af2ac3e13e45752af03c8a933f9b6e18841b128b

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

With the help from bpfptr_t prepare relevant bpf syscall commands
to be used from kernel and user space.
Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Acked-by: NAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210514003623.28033-4-alexei.starovoitov@gmail.com
(cherry picked from commit af2ac3e1)
Signed-off-by: NWang Yufen <wangyufen@huawei.com>

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