linux-kernel - Re: [PATCH v6 1/7] arm64: mm: Move reserve_crashkernel() into mem

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Date:   Thu, 19 Nov 2020 17:25:24 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     devicetree@...r.kernel.org, lorenzo.pieralisi@....com,
        Chen Zhou <chenzhou10@...wei.com>, robin.murphy@....com,
        linux-kernel@...r.kernel.org, jeremy.linton@....com,
        ardb@...nel.org, iommu@...ts.linux-foundation.org,
        robh+dt@...nel.org, James Morse <james.morse@....com>,
        linux-rpi-kernel@...ts.infradead.org, guohanjun@...wei.com,
        will@...nel.org, hch@....de, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 1/7] arm64: mm: Move reserve_crashkernel() into
 mem_init()

On Thu, Nov 19, 2020 at 05:10:49PM +0000, Catalin Marinas wrote:
> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
> index ed71b1c305d7..acdec0c67d3b 100644
> --- a/arch/arm64/mm/mmu.c
> +++ b/arch/arm64/mm/mmu.c
> @@ -469,6 +469,21 @@ void __init mark_linear_text_alias_ro(void)
>  			    PAGE_KERNEL_RO);
>  }
>  
> +static bool crash_mem_map __initdata;
> +
> +static int __init enable_crash_mem_map(char *arg)
> +{
> +	/*
> +	 * Proper parameter parsing is done by reserve_crashkernel(). We only
> +	 * need to know if the linear map has to avoid block mappings so that
> +	 * the crashkernel reservations can be unmapped later.
> +	 */
> +	crash_mem_map = false;

It should be set to true.

-- 
Catalin