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sourceの入手と展開

$ wget https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.11.tar.xz https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.11.tar.sign
$ unxz ./linux-5.11.tar.xz
$ gpg --verify ./linux-5.11.tar.sign 
gpg: assuming signed data in './linux-5.11.tar'
gpg: Signature made Mon 15 Feb 2021 06:11:32 PM JST
gpg:                using RSA key 647F28654894E3BD457199BE38DBBDC86092693E
gpg: Good signature from "Greg Kroah-Hartman <gregkh@linuxfoundation.org>" [unknown]
gpg:                 aka "Greg Kroah-Hartman (Linux kernel stable release signing key) <greg@kroah.com>" [undefined]
gpg:                 aka "Greg Kroah-Hartman <gregkh@kernel.org>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 647F 2865 4894 E3BD 4571  99BE 38DB BDC8 6092 693E
$ tar tvf ./linux-5.11.tar | lv
$ tar xf ./linux-5.11.tar
$ cd linux-5.11

$ cp /boot/config-`uname -r` ./.config
$ yes "" | make oldconfig

$ tar xf ../linux_5.10.9-1.debian.tar.xz debian/certs/
$ time make -j`nproc` bindeb-pkg
  :
BTF: .tmp_vmlinux.btf: pahole (pahole) is not available
Failed to generate BTF for vmlinux
Try to disable CONFIG_DEBUG_INFO_BTF
make[3]: *** [Makefile:1165: vmlinux] Error 1
make[2]: *** [debian/rules:7: build-arch] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2
make[1]: *** [scripts/Makefile.package:83: bindeb-pkg] Error 2
make: *** [Makefile:1528: bindeb-pkg] Error 2
$ sudo apt install dwarves

$ time make -j`nproc` bindeb-pkg
  :
  dpkg-deb: building package 'linux-libc-dev' in '../linux-libc-dev_5.11.0-1_amd64.deb'.
dpkg-deb: building package 'linux-image-5.11.0' in '../linux-image-5.11.0_5.11.0-1_amd64.deb'.
dpkg-deb: building package 'linux-image-5.11.0-dbg' in '../linux-image-5.11.0-dbg_5.11.0-1_amd64.deb'.
 dpkg-genbuildinfo --build=binary
 dpkg-genchanges --build=binary >../linux-5.11.0_5.11.0-1_amd64.changes
dpkg-genchanges: info: binary-only upload (no source code included)
 dpkg-source --after-build .
dpkg-buildpackage: info: binary-only upload (no source included)
$ ls -1s ../linux*.deb
  7932 ../linux-headers-5.11.0_5.11.0-1_amd64.deb
728724 ../linux-image-5.11.0-dbg_5.11.0-1_amd64.deb
 52136 ../linux-image-5.11.0_5.11.0-1_amd64.deb
  1124 ../linux-libc-dev_5.11.0-1_amd64.deb

$ sudo apt install ../linux-image-5.11.0_5.11.0-1_amd64.deb ../linux-libc-dev_5.11.0-1_amd64.deb ../linux-headers-5
.11.0_5.11.0-1_amd64.deb

$ sudo sbsign --key ~/MOK.priv --cert ~/MOK.pem /boot/vmlinuz-5.11.0 --output vmlinuz-5.11.0
$ sudo mv ./vmlinuz-5.11.0 /boot/vmlinuz-5.11.0

$ find /lib/modules/5.11.0/updates/dkms/ -type f | xargs -n1 sudo ./scripts/sign-file sha256 ~/MOK.priv ~/MOK.der

patchする

$ wget https://cdn.kernel.org/pub/linux/kernel/v5.x/patch-5.11.8.xz

$ wget https://cdn.kernel.org/pub/linux/kernel/v5.x/incr/patch-5.11.7-8.xz

$ cd linux-5.11

$ xzcat ../patch-5.11.8.xz | patch -p1

$ xzcat ../patch-5.11.7-8.xz | patch -p1

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