mainline inclusion
from mainline-5.12-rc1
commit 750e5d76
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=750e5d7649b1415e27979f91f917fa5e103714d9

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

Add a basic test for map-in-map and per-cpu maps in sleepable programs.
Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Acked-by: NAndrii Nakryiko <andrii@kernel.org>
Acked-by: NKP Singh <kpsingh@kernel.org>
Link: https://lore.kernel.org/bpf/20210210033634.62081-10-alexei.starovoitov@gmail.com
(cherry picked from commit 750e5d76)
Signed-off-by: NWang Yufen <wangyufen@huawei.com>