linux-kernel - Re: [PATCH 0269/1285] Replace numeric parameter like 0444 with macro

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Date:	Tue, 2 Aug 2016 08:14:10 -0700
From:	Bart Van Assche <bart.vanassche@...disk.com>
To:	Baole Ni <baolex.ni@...el.com>, <dledford@...hat.com>,
	<sean.hefty@...el.com>, <hal.rosenstock@...il.com>, <bp@...en8.de>
CC:	<linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<leon@...nel.org>, <cl@...ux.com>, <erezsh@...lanox.com>,
	<haggaie@...lanox.com>, <markb@...lanox.com>,
	<matanb@...lanox.com>, <eli@...lanox.com>, <guysh@...lanox.com>,
	<ogerlitz@...lanox.com>, <chuansheng.liu@...el.com>
Subject: Re: [PATCH 0269/1285] Replace numeric parameter like 0444 with macro

On 08/02/2016 03:55 AM, Baole Ni 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.
>
> Signed-off-by: Chuansheng Liu <chuansheng.liu@...el.com>
> Signed-off-by: Baole Ni <baolex.ni@...el.com>
> ---
>  drivers/infiniband/ulp/ipoib/ipoib_main.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
> index 5f58c41..eed3e3c 100644
> --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
> +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
> @@ -65,15 +65,15 @@ MODULE_VERSION(DRV_VERSION);
>  int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
>  int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
>
> -module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
> +module_param_named(send_queue_size, ipoib_sendq_size, int, S_IRUSR | S_IRGRP | S_IROTH);
>  MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
> -module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
> +module_param_named(recv_queue_size, ipoib_recvq_size, int, S_IRUSR | S_IRGRP | S_IROTH);
>  MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
>
>  #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
>  int ipoib_debug_level;
>
> -module_param_named(debug_level, ipoib_debug_level, int, 0644);
> +module_param_named(debug_level, ipoib_debug_level, int, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
>  MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
>  #endif

Hello Baole,

Please change 0444 into S_IRUGO and 0644 into S_IRUGO | S_IWUSR. The 
latter form is more compact and hence makes the code easier to read.

Thanks,

Bart.