Thank you very much!
This is the kernel.spec file after modification.
http://cwillu.com:8080/112.119.240.206/5
Then I got build dependencies errors:
$ rpmbuild -bb kernel.spec
setting SOURCE_DATE_EPOCH=1627084800
error: Failed build dependencies:
asciidoc is needed by kernel-5.14.0-0.rc3.29.20210803.fc34.x86_64
audit-libs-devel is needed by kernel-5.14.0-0.rc3.29.20210803.fc34.x86_64
libbabeltrace-devel is needed by kernel-5.14.0-0.rc3.29.20210803.fc34.x86_64
libbpf-devel is needed by kernel-5.14.0-0.rc3.29.20210803.fc34.x86_64
libcap-ng-devel is needed by kernel-5.14.0-0.rc3.29.20210803.fc34.x86_64
libtraceevent-devel is needed by kernel-5.14.0-0.rc3.29.20210803.fc34.x86_64
newt-devel is needed by kernel-5.14.0-0.rc3.29.20210803.fc34.x86_64
numactl-devel is needed by kernel-5.14.0-0.rc3.29.20210803.fc34.x86_64
perl(ExtUtils::Embed) is needed by kernel-5.14.0-0.rc3.29.20210803.fc34.x86_64
xmlto is needed by kernel-5.14.0-0.rc3.29.20210803.fc34.x86_64
I will try to install all of them then try again.