linux-kernel - Re: [PATCH 1/2] arm64: mm: apply __ro_after_init to memory

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Message-ID: <3204def4-df7b-4a0c-1b8d-045ead96f0b2@arm.com>
Date:   Fri, 21 Jan 2022 07:58:39 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>, catalin.marinas@....com,
        will@...nel.org, rppt@...nel.org
Cc:     akpm@...ux-foundation.org, david@...hat.com,
        geert+renesas@...der.be, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-imx@....com,
        Peng Fan <peng.fan@....com>
Subject: Re: [PATCH 1/2] arm64: mm: apply __ro_after_init to memory_limit



On 12/15/21 12:15 PM, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> This variable is only set during initialization, so mark with
> __ro_after_init.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  arch/arm64/mm/init.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index a8834434af99..db63cc885771 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -172,7 +172,7 @@ int pfn_is_map_memory(unsigned long pfn)
>  }
>  EXPORT_SYMBOL(pfn_is_map_memory);
>  
> -static phys_addr_t memory_limit = PHYS_ADDR_MAX;
> +static phys_addr_t memory_limit __ro_after_init = PHYS_ADDR_MAX;
>  
>  /*
>   * Limit the memory size that was specified via FDT.
> 

Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>