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ffcf5db6ee
The kernel build currently downloads the source tar ball every time, which is a little tedious when experimenting with kernel configs or when compiling the kernel multiple times. This commit adds a new 'fetch' make target which downloads the kernel sources into ./sources. Then in the Dockerfile we add the directory and only download the source if it is not present. The tarballs signature is till checked on each build. Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
See ../docs/kernel-patches.md for more information on kernel builds.
To build with various debug options enabled, build the kernel with
make DEBUG=1. The options enabled are listed in kernel_config.debug.
This allocates a significant amount of memory on boot and you may need to
adjust the kernel config on some systems. Specifically:
--- a/alpine/kernel/kernel_config
+++ b/alpine/kernel/kernel_config
@@ -415,8 +415,8 @@ CONFIG_DMI=y
# CONFIG_CALGARY_IOMMU is not set
CONFIG_SWIOTLB=y
CONFIG_IOMMU_HELPER=y
-CONFIG_MAXSMP=y
-CONFIG_NR_CPUS=8192
+CONFIG_MAXSMP=n
+CONFIG_NR_CPUS=8
# CONFIG_SCHED_SMT is not set
CONFIG_SCHED_MC=y
# CONFIG_PREEMPT_NONE is not set