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"crashkernel=" kernel parameter specifies the size (and optionally the start address) of the system ram to be used by crash dump kernel. reserve_crashkernel() will allocate and reserve that memory at boot time of primary kernel. The memory range will be exposed to userspace as a resource named "Crash kernel" in /proc/iomem. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Pratyush Anand <panand@redhat.com> Reviewed-by: James Morse <james.morse@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>