linux-kernel - Re: [PATCH] ARM: fix link warning with XIP + frame-pointer

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Date:   Tue, 12 Jan 2021 09:27:09 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Russell King <linux@...linux.org.uk>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] ARM: fix link warning with XIP + frame-pointer

On Tue, Jan 12, 2021 at 04:46:40PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> When frame pointers are used instead of the ARM unwinder,
> and the kernel is built using clang with an external assembler
> and CONFIG_XIP_KERNEL, every file produces two warnings
> like:
> 
> arm-linux-gnueabi-ld: warning: orphan section `.ARM.extab' from `net/mac802154/util.o' being placed in section `.ARM.extab'
> arm-linux-gnueabi-ld: warning: orphan section `.ARM.exidx' from `net/mac802154/util.o' being placed in section `.ARM.exidx'
> 
> The same fix was already merged for the normal (non-XIP)
> linker script, with a longer description.
> 
> Fixes: c39866f268f8 ("arm/build: Always handle .ARM.exidx and .ARM.extab sections")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>

> ---
>  arch/arm/kernel/vmlinux-xip.lds.S | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/arm/kernel/vmlinux-xip.lds.S b/arch/arm/kernel/vmlinux-xip.lds.S
> index 4d0b0cd9222e..ddb70c65d525 100644
> --- a/arch/arm/kernel/vmlinux-xip.lds.S
> +++ b/arch/arm/kernel/vmlinux-xip.lds.S
> @@ -43,6 +43,10 @@ SECTIONS
>  		ARM_DISCARD
>  		*(.alt.smp.init)
>  		*(.pv_table)
> +#ifndef CONFIG_ARM_UNWIND
> +		*(.ARM.exidx) *(.ARM.exidx.*)
> +		*(.ARM.extab) *(.ARM.extab.*)
> +#endif
>  	}
>  
>  	. = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
> -- 
> 2.29.2
>