linux-kernel - Re: [PATCH 1070/1285] Replace numeric parameter like 0444 with macro

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Date:	Tue, 2 Aug 2016 09:24:15 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Baole Ni <baolex.ni@...el.com>
Cc:	paulmck@...ux.vnet.ibm.com, josh@...htriplett.org,
	mathieu.desnoyers@...icios.com, jiangshanlai@...il.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, tj@...nel.org,
	jpoimboe@...hat.com
Subject: Re: [PATCH 1070/1285] Replace numeric parameter like 0444 with
 macro

On Tue,  2 Aug 2016 20:13:43 +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/rcu/rcuperf.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c
> index 3cee0d8..3812e93 100644
> --- a/kernel/rcu/rcuperf.c
> +++ b/kernel/rcu/rcuperf.c
> @@ -66,7 +66,7 @@ torture_param(bool, shutdown, false, "Shutdown at end of performance tests.");
>  torture_param(bool, verbose, true, "Enable verbose debugging printk()s");
>  
>  static char *perf_type = "rcu";
> -module_param(perf_type, charp, 0444);
> +module_param(perf_type, charp, S_IRUSR | S_IRGRP | S_IROTH);
>  MODULE_PARM_DESC(perf_type, "Type of RCU to performance-test (rcu, rcu_bh, ...)");
>  
>  static int nrealreaders;
> @@ -102,7 +102,7 @@ static int rcu_perf_writer_state;
>  #define RCUPERF_RUNNABLE_INIT 0
>  #endif
>  static int perf_runnable = RCUPERF_RUNNABLE_INIT;
> -module_param(perf_runnable, int, 0444);
> +module_param(perf_runnable, int, S_IRUSR | S_IRGRP | S_IROTH);
>  MODULE_PARM_DESC(perf_runnable, "Start rcuperf at boot");
>  
>  /*