linux-kernel - Re: [PATCH] arm64: vdso: remove two .altinstructions related symbols

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Date:   Thu, 27 Jul 2023 11:19:27 +0100
From:   Will Deacon <will@...nel.org>
To:     Jisheng Zhang <jszhang@...nel.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: vdso: remove two .altinstructions related symbols

On Thu, Jul 27, 2023 at 01:36:19AM +0800, Jisheng Zhang wrote:
> The two symbols __alt_instructions and __alt_instructions_end are not
> used, remove them.
> 
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> ---
>  arch/arm64/kernel/vdso/vdso.lds.S | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/arch/arm64/kernel/vdso/vdso.lds.S b/arch/arm64/kernel/vdso/vdso.lds.S
> index 6028f1fe2d1c..45354f2ddf70 100644
> --- a/arch/arm64/kernel/vdso/vdso.lds.S
> +++ b/arch/arm64/kernel/vdso/vdso.lds.S
> @@ -50,9 +50,7 @@ SECTIONS
>  
>  	. = ALIGN(4);
>  	.altinstructions : {
> -		__alt_instructions = .;
>  		*(.altinstructions)
> -		__alt_instructions_end = .;
>  	}

If we don't need the symbols, then why do we need this section at all?

Will