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SubjectRe: [PATCH 2/2] arm64: add support for 43bit physical address
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I didn’t try FLATMEM. Thanks for advising, I enabled FLATMEM for ARM64 and am able to save ~14M. Will post a new patch for Kconfig changes.

Thanks,
-Nikunj

On 7/5/18, 11:35 AM, "Catalin Marinas" <catalin.marinas@arm.com> wrote:

On Tue, Jul 03, 2018 at 06:35:32PM +0000, Nikunj Kela (nkela) wrote:
> We are trying to reduce the memory allocation needed for kdump kernel.
> We want to reserve less than 32M for kdump kernel if possible. We are
> able to get ~14M saving by the proposed change.

Have you tried disabling SPARSEMEM and using FLATMEM for this case? With
32M you wouldn't need more than a section anyway. It needs some tweaking
of the arm64 Kconfig and probably fail to build.

--
Catalin


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