linux-kernel - Re: [PATCH] ARM: cpuidle: declare cpuidle_ops __read

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Date:	Wed, 10 Aug 2016 17:54:03 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	<linux@...linux.org.uk>, <daniel.lezcano@...aro.org>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: cpuidle: declare cpuidle_ops __read_mostly


On Wed, 10 Aug 2016 16:49:57 +0800 Jisheng Zhang wrote:

> cpuidle_ops is initialized once by arm_cpuidle_read_ops() during
> initialization, and thereafter is mostly read in arm_cpuidle_suspend()
> 
> The fact that it is mostly read and not written to makes it candidates
> for __read_mostly declarations.
> 
> Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
> ---
>  arch/arm/kernel/cpuidle.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/kernel/cpuidle.c b/arch/arm/kernel/cpuidle.c
> index 7dccc96..762e0929 100644
> --- a/arch/arm/kernel/cpuidle.c
> +++ b/arch/arm/kernel/cpuidle.c
> @@ -19,7 +19,7 @@ extern struct of_cpuidle_method __cpuidle_method_of_table[];
>  static const struct of_cpuidle_method __cpuidle_method_of_table_sentinel
>  	__used __section(__cpuidle_method_of_table_end);
>  
> -static struct cpuidle_ops cpuidle_ops[NR_CPUS];
> +static struct cpuidle_ops cpuidle_ops[NR_CPUS] __read_mostly;


oops, I just found that "arm: apply more __ro_after_init" from Kees
marked cpuidle_ops as __ro_after_init, that also meet my need, so
let's drop my patch.

Thanks,
Jisheng