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[redhat] Generate a crashkernel.conf for each kernel build

Kairui Song requested to merge kasong/kernel-ark:crashkernel-conf into os-build

It has been a long-term demand for having a default crashkernel value for each kernel build. This helps to manage kernel's crashkernel usage by kernel version and provide users a reference default value.

RHEL kernels support a crashkernel=auto cmdline param. And kernel have a built-in default value used when auto is specified. Many attempts are made to push this upstream. Recent attempt to push this upstream raised a lot of discussions 1.

Upstream is not accepting this crashkernel=auto design. So after more discussions, instead of adding a default value in kernel, just add a config that packaged with kernel is more doable. Other packages, like kexec-tools2, can use this as a reference and update kernel cmdline param.

Signed-off-by: Kairui Song kasong@redhat.com

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