linux-kernel - Re: [PATCH] mm: make 'highmem' symbol ro_after

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Message-ID: <346af9f-d9ea-463a-686e-1cce79a1c8d2@google.com>
Date:   Mon, 24 Jan 2022 10:17:14 -0800 (PST)
From:   David Rientjes <rientjes@...gle.com>
To:     Ard Biesheuvel <ardb@...nel.org>
cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: make 'highmem' symbol ro_after_init

On Mon, 24 Jan 2022, Ard Biesheuvel wrote:

> diff --git a/mm/memory.c b/mm/memory.c
> index c125c4969913..50e82cb94ccc 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -106,7 +106,7 @@ EXPORT_SYMBOL(mem_map);
>   * highstart_pfn must be the same; there must be no gap between ZONE_NORMAL
>   * and ZONE_HIGHMEM.
>   */
> -void *high_memory;
> +void *high_memory __ro_after_init;
>  EXPORT_SYMBOL(high_memory);
>  
>  /*

Same should be true for the mm/nommu.c variant?