mainline inclusion
from mainline-5.13-rc1
commit 797b84f7
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=797b84f727bce9c64ea2c85899c1ba283df54c16

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

This patch adds kernel function call support to the x86-32 bpf jit.
Signed-off-by: NMartin KaFai Lau <kafai@fb.com>
Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210325015149.1545267-1-kafai@fb.com
(cherry picked from commit 797b84f7)
Signed-off-by: NWang Yufen <wangyufen@huawei.com>