linux-kernel - Re: fixup for [PATCH 5.4 18/43] arm64 entry: Add macro for reading symbol address from the trampoline

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Date:   Sat, 19 Mar 2022 09:17:10 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     James Morse <james.morse@....com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: fixup for [PATCH 5.4 18/43] arm64 entry: Add macro for reading
 symbol address from the trampoline

On Fri, Mar 18, 2022 at 05:37:13PM +0000, James Morse wrote:
> __sdei_asm_trampoline_next_handler shouldn't have its own name as the
> tramp_data_read_var takes the symbol name, and generates the name for
> the value in the data page if CONFIG_RANDOMIZE_BASE is clear.
> 
> This means when CONFIG_RANDOMIZE_BASE is clear, this code won't compile
> as __sdei_asm_trampoline_next_handler doesn't exist.
> 
> Use the proper name, and let the macro do its thing.
> 
> Reported-by: Florian Fainelli <f.fainelli@...il.com>
> Tested-by: Florian Fainelli <f.fainelli@...il.com>
> Signed-off-by: James Morse <james.morse@....com>
> ---
>  arch/arm64/kernel/entry.S | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
> index e4b5a15c2e2e..cfc0bb6c49f7 100644
> --- a/arch/arm64/kernel/entry.S
> +++ b/arch/arm64/kernel/entry.S
> @@ -1190,7 +1190,7 @@ __entry_tramp_data_start:
>  __entry_tramp_data_vectors:
>  	.quad	vectors
>  #ifdef CONFIG_ARM_SDE_INTERFACE
> -__entry_tramp_data___sdei_asm_trampoline_next_handler:
> +__entry_tramp_data___sdei_asm_handler:
>  	.quad	__sdei_asm_handler
>  #endif /* CONFIG_ARM_SDE_INTERFACE */
>  	.popsection				// .rodata
> @@ -1319,7 +1319,7 @@ ENTRY(__sdei_asm_entry_trampoline)
>  	 */
>  1:	str	x4, [x1, #(SDEI_EVENT_INTREGS + S_ORIG_ADDR_LIMIT)]
>  
> -	tramp_data_read_var     x4, __sdei_asm_trampoline_next_handler
> +	tramp_data_read_var     x4, __sdei_asm_handler
>  	br	x4
>  ENDPROC(__sdei_asm_entry_trampoline)
>  NOKPROBE(__sdei_asm_entry_trampoline)
> -- 
> 2.30.2
> 

Thanks, now queued up.

greg k-h