linux-kernel - Re: [PATCH] arm64: kdump: Do not allocate crash low memory if not needed

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Message-Id: <165272800400.3869992.18113408678309495430.b4-ty@arm.com>
Date:   Mon, 16 May 2022 20:06:51 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Dave Young <dyoung@...hat.com>, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Will Deacon <will@...nel.org>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Baoquan He <bhe@...hat.com>, Vivek Goyal <vgoyal@...hat.com>,
        linux-doc@...r.kernel.org, Jonathan Corbet <corbet@....net>
Cc:     Chen Zhou <dingguo.cz@...group.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        John Donnelly <John.p.donnelly@...cle.com>,
        Dave Kleikamp <dave.kleikamp@...cle.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Feng Zhou <zhoufeng.zf@...edance.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] arm64: kdump: Do not allocate crash low memory if not needed

On Wed, 11 May 2022 11:20:32 +0800, Zhen Lei wrote:
> When "crashkernel=X,high" is specified, the specified "crashkernel=Y,low"
> memory is not required in the following corner cases:
> 1. If both CONFIG_ZONE_DMA and CONFIG_ZONE_DMA32 are disabled, it means
>    that the devices can access any memory.
> 2. If the system memory is small, the crash high memory may be allocated
>    from the DMA zones. If that happens, there's no need to allocate
>    another crash low memory because there's already one.
> 
> [...]

Applied to arm64 (for-next/crashkernel), thanks!

[1/1] arm64: kdump: Do not allocate crash low memory if not needed
      https://git.kernel.org/arm64/c/8f0f104e2ab6

-- 
Catalin