[PATCH 1074/1285] Replace numeric parameter like 0444 with macro

[PATCH 1074/1285] Replace numeric parameter like 0444 with macro

[Baole Ni]

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@intel.com>
Signed-off-by: Baole Ni <baolex.ni@intel.com>
---
 kernel/time/clockevents.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index a9b76a4..a0ff0f8 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -667,7 +667,7 @@ static ssize_t sysfs_show_current_tick_dev(struct device *dev,
 	raw_spin_unlock_irq(&clockevents_lock);
 	return count;
 }
-static DEVICE_ATTR(current_device, 0444, sysfs_show_current_tick_dev, NULL);
+static DEVICE_ATTR(current_device, S_IRUSR | S_IRGRP | S_IROTH, sysfs_show_current_tick_dev, NULL);
 
 /* We don't support the abomination of removable broadcast devices */
 static ssize_t sysfs_unbind_tick_dev(struct device *dev,
@@ -699,7 +699,7 @@ static ssize_t sysfs_unbind_tick_dev(struct device *dev,
 	mutex_unlock(&clockevents_mutex);
 	return ret ? ret : count;
 }
-static DEVICE_ATTR(unbind_device, 0200, NULL, sysfs_unbind_tick_dev);
+static DEVICE_ATTR(unbind_device, S_IWUSR, NULL, sysfs_unbind_tick_dev);
 
 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 static struct device tick_bc_dev = {
-- 
2.9.2

Re: [PATCH 1074/1285] Replace numeric parameter like 0444 with macro

[Steven Rostedt]

On Tue,  2 Aug 2016 20:14:04 +0800
Baole Ni <baolex.ni@intel.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@intel.com>
> Signed-off-by: Baole Ni <baolex.ni@intel.com>
> ---
>  kernel/time/clockevents.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
> index a9b76a4..a0ff0f8 100644
> --- a/kernel/time/clockevents.c
> +++ b/kernel/time/clockevents.c
> @@ -667,7 +667,7 @@ static ssize_t sysfs_show_current_tick_dev(struct device *dev,
>  	raw_spin_unlock_irq(&clockevents_lock);
>  	return count;
>  }
> -static DEVICE_ATTR(current_device, 0444, sysfs_show_current_tick_dev, NULL);
> +static DEVICE_ATTR(current_device, S_IRUSR | S_IRGRP | S_IROTH, sysfs_show_current_tick_dev, NULL);
>  
>  /* We don't support the abomination of removable broadcast devices */
>  static ssize_t sysfs_unbind_tick_dev(struct device *dev,
> @@ -699,7 +699,7 @@ static ssize_t sysfs_unbind_tick_dev(struct device *dev,
>  	mutex_unlock(&clockevents_mutex);
>  	return ret ? ret : count;
>  }
> -static DEVICE_ATTR(unbind_device, 0200, NULL, sysfs_unbind_tick_dev);
> +static DEVICE_ATTR(unbind_device, S_IWUSR, NULL, sysfs_unbind_tick_dev);
>  
>  #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
>  static struct device tick_bc_dev = {