linux-kernel - Re: [PATCH] arm64/smp: Drop the macro S(x,s)

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Message-ID: <20201109114825.GA64518@C02TD0UTHF1T.local>
Date:   Mon, 9 Nov 2020 11:48:25 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64/smp: Drop the macro S(x,s)

On Mon, Nov 09, 2020 at 05:08:36PM +0530, Anshuman Khandual wrote:
> Mapping between IPI type index and its string is direct without requiring
> an additional offset. Hence the existing macro S(x, s) is now redundant
> and can just be dropped. This also makes the code clean and simple.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Marc Zyngier <maz@...nel.org>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>

Nice cleanup!

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

Mark.

> ---
>  arch/arm64/kernel/smp.c | 15 +++++++--------
>  1 file changed, 7 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
> index 09c96f57818c..65d18a618abe 100644
> --- a/arch/arm64/kernel/smp.c
> +++ b/arch/arm64/kernel/smp.c
> @@ -786,14 +786,13 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
>  }
>  
>  static const char *ipi_types[NR_IPI] __tracepoint_string = {
> -#define S(x,s)	[x] = s
> -	S(IPI_RESCHEDULE, "Rescheduling interrupts"),
> -	S(IPI_CALL_FUNC, "Function call interrupts"),
> -	S(IPI_CPU_STOP, "CPU stop interrupts"),
> -	S(IPI_CPU_CRASH_STOP, "CPU stop (for crash dump) interrupts"),
> -	S(IPI_TIMER, "Timer broadcast interrupts"),
> -	S(IPI_IRQ_WORK, "IRQ work interrupts"),
> -	S(IPI_WAKEUP, "CPU wake-up interrupts"),
> +	[IPI_RESCHEDULE]	= "Rescheduling interrupts",
> +	[IPI_CALL_FUNC]		= "Function call interrupts",
> +	[IPI_CPU_STOP]		= "CPU stop interrupts",
> +	[IPI_CPU_CRASH_STOP]	= "CPU stop (for crash dump) interrupts",
> +	[IPI_TIMER]		= "Timer broadcast interrupts",
> +	[IPI_IRQ_WORK]		= "IRQ work interrupts",
> +	[IPI_WAKEUP]		= "CPU wake-up interrupts",
>  };
>  
>  static void smp_cross_call(const struct cpumask *target, unsigned int ipinr);
> -- 
> 2.20.1
>