linux-kernel - Re: [PATCH 2/2] arm64: add support for 43bit physical address

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Message-ID: <9FA2F50C-F4C8-460C-B6BF-B9DF38C95111@cisco.com>
Date:   Thu, 5 Jul 2018 23:40:39 +0000
From:   "Nikunj Kela (nkela)" <nkela@...co.com>
To:     Catalin Marinas <catalin.marinas@....com>
CC:     "xe-kernel@...ernal.cisco.com" <xe-kernel@...ernal.cisco.com>,
        Will Deacon <will.deacon@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/2] arm64: add support for 43bit physical address

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@....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