linux-kernel - Re: "kernel ade access" oops on LoongArch

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Date:   Wed, 15 Feb 2023 16:35:43 +0800
From:   Xi Ruoyao <xry111@...111.site>
To:     Youling Tang <tangyouling@...ngson.cn>
Cc:     Jinyang He <hejinyang@...ngson.cn>, loongarch@...ts.linux.dev,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>, linux-kernel@...r.kernel.org
Subject: Re: "kernel ade access" oops on LoongArch

On Wed, 2023-02-15 at 16:25 +0800, Youling Tang wrote:
> Can you modify the kernel as follows and test it, so as to avoid
> possible relationship with the exception table data link position and
> alignment rules (or use EXCEPTION_TABLE(12))?
> 
> --- a/arch/loongarch/kernel/vmlinux.lds.S
> +++ b/arch/loongarch/kernel/vmlinux.lds.S
> @@ -4,7 +4,6 @@
>   #include <asm/thread_info.h>
> 
>   #define PAGE_SIZE _PAGE_SIZE
> -#define RO_EXCEPTION_TABLE_ALIGN       4
> 
>   /*
>    * Put .bss..swapper_pg_dir as the first thing in .bss. This will
> @@ -54,6 +53,8 @@ SECTIONS
>          . = ALIGN(PECOFF_SEGMENT_ALIGN);
>          _etext = .;
> 
> +       EXCEPTION_TABLE(16)
> +

It seems the kernel refuses to boot after the change, but I'm not
completely sure: I'm 5 km away from the board and operating it via ssh
so maybe it's a reboot failure or network failure.  I'll report again in
the evening.

-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University