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--- fuss:debian [2019/07/27 02:58] – [Reinstall Package and All Dependencies] office
+++ fuss:debian [2020/02/28 05:41] – [Execute Java Program under Different JDK Version] office
@@ Line 344: / Line 344: @@
 to set the java JDK version to be used.
+====== Recompile Debian Kernel ======
+[[https://www.circuidipity.com/kernel/|Summarizing]], either use apt to fetch the source code, ie:
+<code bash>
+apt-get source linux-image-4.19.0-8-amd64
+</code>
+or download the kernel source code manually from http://kernel.org.
+Since Debian does not define the kernel compilation parameter to include the current kernel configuration in memory under ''/proc/config.gz'' but stores the configuration under ''/boot'', the configuration can be copied into the current kernel source directory:
+<code bash>
+cp /boot/config-4.19.0-8-amd64 .config
+</code>
+In case a different kernel version is to be compiled compared to the current kernel configuration, the following command:
+<code bash>
+make olddefconfig
+</code>
+should accept the default for the current kernel version.
+If compiling under Debian, the current configuration ''.config'' has to be edited and ''CONFIG_SYSTEM_TRUSTED_KEYS'' set to the empty string:
+<code>
+CONFIG_SYSTEM_TRUSTED_KEYS=""
+</code>
+in order to avoid a compilation error:
+<code>
+No rule to make target 'debian/certs/debian-uefi-certs.pem', needed by 'certs/x509_certificate_list'.  Stop.
+</code>
+Additionally, since Debian builds the debug packages of the kernel by default which takes a long while and uses up a lot of disk resources, the kernel configuration in ''.config'' can be edit and the parameter ''CONFIG_DEBUG_INFO'' adjusted to ''n'' to skip building the debug packages:
+<code bash>
+CONFIG_DEBUG_INFO=n
+</code>
+The usual pair of commands, either ''nconfig'':
+<code bash>
+make nconfig
+</code>
+or ''makeconfig'' can be issued in order to make any changes to the copied configuration:
+<code bash>
+make menuconfig
+</code>
+Finally, issue:
+<code bash>
+make deb-pkg LOCALVERSION=-custom
+</code>
+where:
+  * ''-custom'' is a build name appended to the kernel package that will be built.