linux-kernel - Re: [PATCH 1078/1285] Replace numeric parameter like 0444 with macro

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Date:	Tue, 2 Aug 2016 09:26:20 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Baole Ni <baolex.ni@...el.com>
Cc:	tj@...nel.org, jiangshanlai@...il.com,
	mathieu.desnoyers@...icios.com, m.chehab@...sung.com,
	gregkh@...uxfoundation.org, m.szyprowski@...sung.com,
	kyungmin.park@...sung.com, k.kozlowski@...sung.com,
	linux-kernel@...r.kernel.org, chuansheng.liu@...el.com,
	mhocko@...e.com, tglx@...utronix.de, vkuznets@...hat.com,
	pmladek@...e.com, jpoimboe@...hat.com
Subject: Re: [PATCH 1078/1285] Replace numeric parameter like 0444 with
 macro

On Tue,  2 Aug 2016 20:14:26 +0800
Baole Ni <baolex.ni@...el.com> wrote:

> I find that the developers often just specified the numeric value
> when calling a macro which is defined with a parameter for access permission.
> As we know, these numeric value for access permission have had the corresponding macro,
> and that using macro can improve the robustness and readability of the code,
> thus, I suggest replacing the numeric parameter with the macro.
> 

NACK!

I find 0444 more readable than S_IRUSR | S_IRGRP | S_IROTH.

-- Steve

> Signed-off-by: Chuansheng Liu <chuansheng.liu@...el.com>
> Signed-off-by: Baole Ni <baolex.ni@...el.com>
> ---
>  kernel/workqueue.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index e1c0e99..74d92b0 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -284,11 +284,11 @@ static cpumask_var_t *wq_numa_possible_cpumask;
>  					/* possible CPUs of each node */
>  
>  static bool wq_disable_numa;
> -module_param_named(disable_numa, wq_disable_numa, bool, 0444);
> +module_param_named(disable_numa, wq_disable_numa, bool, S_IRUSR | S_IRGRP | S_IROTH);
>  
>  /* see the comment above the definition of WQ_POWER_EFFICIENT */
>  static bool wq_power_efficient = IS_ENABLED(CONFIG_WQ_POWER_EFFICIENT_DEFAULT);
> -module_param_named(power_efficient, wq_power_efficient, bool, 0444);
> +module_param_named(power_efficient, wq_power_efficient, bool, S_IRUSR | S_IRGRP | S_IROTH);
>  
>  static bool wq_numa_enabled;		/* unbound NUMA affinity enabled */
>  
> @@ -317,7 +317,7 @@ static bool wq_debug_force_rr_cpu = true;
>  #else
>  static bool wq_debug_force_rr_cpu = false;
>  #endif
> -module_param_named(debug_force_rr_cpu, wq_debug_force_rr_cpu, bool, 0644);
> +module_param_named(debug_force_rr_cpu, wq_debug_force_rr_cpu, bool, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
>  
>  /* the per-cpu worker pools */
>  static DEFINE_PER_CPU_SHARED_ALIGNED(struct worker_pool [NR_STD_WORKER_POOLS], cpu_worker_pools);
> @@ -5423,7 +5423,7 @@ static const struct kernel_param_ops wq_watchdog_thresh_ops = {
>  };
>  
>  module_param_cb(watchdog_thresh, &wq_watchdog_thresh_ops, &wq_watchdog_thresh,
> -		0644);
> +		S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
>  
>  static void wq_watchdog_init(void)
>  {