arm64: kdump: reserve memory for crash dump kernel

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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>

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AKASHI Takahiro 2017-04-03 11:24:32 +09:00 • committed by Catalin Marinas

parent 8f579b1c4e

commit 764b51ead1

2 changed files with 72 additions and 1 deletions

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7

arch/arm64/kernel/setup.c

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66

arch/arm64/mm/init.c

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