linux-kernel - Re: [PATCH] riscv: alternative: remove alternative boundary symbols in vdso

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Message-ID: <ZPXrKz1jhqz5g3nF@xhacker>
Date:   Mon, 4 Sep 2023 22:35:23 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Xiao Wang <xiao.w.wang@...el.com>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: alternative: remove alternative boundary symbols
 in vdso

On Sat, Sep 02, 2023 at 10:25:10AM +0800, Xiao Wang wrote:
> Instruction patching for vdso is based on elf header parsing to get the
> beginning and ending of .alternative section, the __alt_start and __alt_end
> symbols defined in vdso linker script are not used, so this patch removes
> them.

The same patch has been in mailist since July:

https://lore.kernel.org/linux-riscv/20230726173024.3684-2-jszhang@kernel.org/

Thanks
> 
> Signed-off-by: Xiao Wang <xiao.w.wang@...el.com>
> ---
>  arch/riscv/kernel/vdso/vdso.lds.S | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/arch/riscv/kernel/vdso/vdso.lds.S b/arch/riscv/kernel/vdso/vdso.lds.S
> index 82ce64900f3d..d43fd7c7dd11 100644
> --- a/arch/riscv/kernel/vdso/vdso.lds.S
> +++ b/arch/riscv/kernel/vdso/vdso.lds.S
> @@ -42,9 +42,7 @@ SECTIONS
>  
>  	. = ALIGN(4);
>  	.alternative : {
> -		__alt_start = .;
>  		*(.alternative)
> -		__alt_end = .;
>  	}
>  
>  	.data		: {
> -- 
> 2.25.1
>