linux-kernel - Re: [PATCH v2] arm64: armv8_deprecated: fix unused-function error

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Date:   Thu, 24 Nov 2022 10:47:34 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Ren Zhijie <renzhijie2@...wei.com>
Cc:     catalin.marinas@....com, will@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        yusongping@...wei.com
Subject: Re: [PATCH v2] arm64: armv8_deprecated: fix unused-function error

On Thu, Nov 24, 2022 at 02:24:29AM +0000, Ren Zhijie wrote:
> If CONFIG_SWP_EMULATION is not set and
> CONFIG_CP15_BARRIER_EMULATION is not set,
> aarch64-linux-gnu complained about unused-function :
> 
> arch/arm64/kernel/armv8_deprecated.c:67:21: error: ‘aarch32_check_condition’ defined but not used [-Werror=unused-function]
>  static unsigned int aarch32_check_condition(u32 opcode, u32 psr)
>                      ^~~~~~~~~~~~~~~~~~~~~~~
> cc1: all warnings being treated as errors
> 
> To fix this warning, modify aarch32_check_condition() with __maybe_unused.
> 
> Fixes: 0c5f416219da ("arm64: armv8_deprecated: move aarch32 helper earlier")
> Signed-off-by: Ren Zhijie <renzhijie2@...wei.com>

Acked-by: Mark Rutland <mark.rutland@....com>

Mark.

> ---
> Changes in v2:
> - modify aarch32_check_condition() with __maybe_unused.
> 
>  arch/arm64/kernel/armv8_deprecated.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kernel/armv8_deprecated.c b/arch/arm64/kernel/armv8_deprecated.c
> index ed0788cf6bbb..8a9052cf3013 100644
> --- a/arch/arm64/kernel/armv8_deprecated.c
> +++ b/arch/arm64/kernel/armv8_deprecated.c
> @@ -64,7 +64,7 @@ struct insn_emulation {
>  
>  #define	ARM_OPCODE_CONDITION_UNCOND	0xf
>  
> -static unsigned int aarch32_check_condition(u32 opcode, u32 psr)
> +static unsigned int __maybe_unused aarch32_check_condition(u32 opcode, u32 psr)
>  {
>  	u32 cc_bits  = opcode >> 28;
>  
> -- 
> 2.17.1
>