[Patch 0/7] Implement crashkernel=auto

[Amerigo Wang]

This series of patch implements automatically reserved memory for crashkernel,
by introducing a new boot option "crashkernel=auto". This idea is from Neil.

In case of breaking user-space applications, it modifies this boot option after
it decides how much memory should be reserved.

On different arch, the threshold and reserved memory size is different. Please
refer patch 7/7 which contains an update for the documentation.

Note: This patchset was only tested on x86_64 with differernt memory sizes.

Signed-off-by: WANG Cong <amwang@xxxxxxxxxx>
Cc: Neil Horman <nhorman@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Anton Vorontsov <avorontsov@xxxxxxxxxxxxx>

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