linux-kernel - Re: [PATCH 2/3] arm64/sdei: gather trampolines' .rodata

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Date:   Tue, 17 Mar 2020 22:32:14 +0000
From:   Will Deacon <will@...nel.org>
To:     Rémi Denis-Courmont <remi@...lab.net>
Cc:     catalin.marinas@....com, linux-arm-kernel@...ts.infradead.org,
        mark.rutland@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] arm64/sdei: gather trampolines' .rodata

On Mon, Mar 16, 2020 at 02:40:45PM +0200, Rémi Denis-Courmont wrote:
> From: Rémi Denis-Courmont <remi.denis.courmont@...wei.com>
> 
> This gathers the two bits of data together for clarity.
> 
> Signed-off-by: Rémi Denis-Courmont <remi.denis.courmont@...wei.com>
> ---
>  arch/arm64/kernel/entry.S | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
> index 24f828739696..af17fcb4aaea 100644
> --- a/arch/arm64/kernel/entry.S
> +++ b/arch/arm64/kernel/entry.S
> @@ -859,6 +859,11 @@ SYM_CODE_END(tramp_exit_compat)
>  #ifdef CONFIG_RANDOMIZE_BASE
>  	.pushsection ".rodata", "a"
>  	.align PAGE_SHIFT
> +#ifdef CONFIG_ARM_SDE_INTERFACE
> +SYM_DATA_START(__sdei_asm_trampoline_next_handler)
> +	.quad	__sdei_asm_handler
> +SYM_DATA_END(__sdei_asm_trampoline_next_handler)
> +#endif
>  SYM_DATA_START(__entry_tramp_data_start)
>  	.quad	vectors
>  SYM_DATA_END(__entry_tramp_data_start)
> @@ -980,13 +985,6 @@ SYM_CODE_END(__sdei_asm_exit_trampoline)
>  NOKPROBE(__sdei_asm_exit_trampoline)
>  	.ltorg
>  .popsection		// .entry.tramp.text
> -#ifdef CONFIG_RANDOMIZE_BASE
> -.pushsection ".rodata", "a"
> -SYM_DATA_START(__sdei_asm_trampoline_next_handler)
> -	.quad	__sdei_asm_handler
> -SYM_DATA_END(__sdei_asm_trampoline_next_handler)
> -.popsection		// .rodata
> -#endif /* CONFIG_RANDOMIZE_BASE */
>  #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */

Acked-by: Will Deacon <will@...nel.org>

Will