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From:   Catalin Marinas <catalin.marinas@arm.com>
To:     Dave Young <dyoung@redhat.com>, kexec@lists.infradead.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        Will Deacon <will@kernel.org>,
        Zhen Lei <thunder.leizhen@huawei.com>,
        Baoquan He <bhe@redhat.com>, Vivek Goyal <vgoyal@redhat.com>,
        linux-doc@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>
Cc:     Chen Zhou <dingguo.cz@antgroup.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        John Donnelly <John.p.donnelly@oracle.com>,
        Dave Kleikamp <dave.kleikamp@oracle.com>,
        Kefeng Wang <wangkefeng.wang@huawei.com>,
        Feng Zhou <zhoufeng.zf@bytedance.com>,
        "Eric W . Biederman" <ebiederm@xmission.com>
Subject: Re: [PATCH] arm64: kdump: Do not allocate crash low memory if not needed
Date:   Mon, 16 May 2022 20:06:51 +0100
Message-Id: <165272800400.3869992.18113408678309495430.b4-ty@arm.com>
In-Reply-To: <20220511032033.426-1-thunder.leizhen@huawei.com>
References: <20220511032033.426-1-thunder.leizhen@huawei.com>
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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