[PATCH 1082/1285] Replace numeric parameter like 0444 with macro

[PATCH 1082/1285] 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>
---
 mm/zswap.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index 275b22c..aede3ee 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -78,7 +78,7 @@ static u64 zswap_duplicate_entry;
 
 /* Enable/disable zswap (disabled by default) */
 static bool zswap_enabled;
-module_param_named(enabled, zswap_enabled, bool, 0644);
+module_param_named(enabled, zswap_enabled, bool, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
 
 /* Crypto compressor to use */
 #define ZSWAP_COMPRESSOR_DEFAULT "lzo"
@@ -91,7 +91,7 @@ static struct kernel_param_ops zswap_compressor_param_ops = {
 	.free =		param_free_charp,
 };
 module_param_cb(compressor, &zswap_compressor_param_ops,
-		&zswap_compressor, 0644);
+		&zswap_compressor, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
 
 /* Compressed storage zpool to use */
 #define ZSWAP_ZPOOL_DEFAULT "zbud"
@@ -102,11 +102,11 @@ static struct kernel_param_ops zswap_zpool_param_ops = {
 	.get =		param_get_charp,
 	.free =		param_free_charp,
 };
-module_param_cb(zpool, &zswap_zpool_param_ops, &zswap_zpool_type, 0644);
+module_param_cb(zpool, &zswap_zpool_param_ops, &zswap_zpool_type, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
 
 /* The maximum percentage of memory that the compressed pool can occupy */
 static unsigned int zswap_max_pool_percent = 20;
-module_param_named(max_pool_percent, zswap_max_pool_percent, uint, 0644);
+module_param_named(max_pool_percent, zswap_max_pool_percent, uint, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
 
 /*********************************
 * data structures
-- 
2.9.2

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Re: [PATCH 1082/1285] Replace numeric parameter like 0444 with macro

[Steven Rostedt]

On Tue,  2 Aug 2016 20:14:48 +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>
> ---
>  mm/zswap.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/zswap.c b/mm/zswap.c
> index 275b22c..aede3ee 100644
> --- a/mm/zswap.c
> +++ b/mm/zswap.c
> @@ -78,7 +78,7 @@ static u64 zswap_duplicate_entry;
>  
>  /* Enable/disable zswap (disabled by default) */
>  static bool zswap_enabled;
> -module_param_named(enabled, zswap_enabled, bool, 0644);
> +module_param_named(enabled, zswap_enabled, bool, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
>  
>  /* Crypto compressor to use */
>  #define ZSWAP_COMPRESSOR_DEFAULT "lzo"
> @@ -91,7 +91,7 @@ static struct kernel_param_ops zswap_compressor_param_ops = {
>  	.free =		param_free_charp,
>  };
>  module_param_cb(compressor, &zswap_compressor_param_ops,
> -		&zswap_compressor, 0644);
> +		&zswap_compressor, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
>  
>  /* Compressed storage zpool to use */
>  #define ZSWAP_ZPOOL_DEFAULT "zbud"
> @@ -102,11 +102,11 @@ static struct kernel_param_ops zswap_zpool_param_ops = {
>  	.get =		param_get_charp,
>  	.free =		param_free_charp,
>  };
> -module_param_cb(zpool, &zswap_zpool_param_ops, &zswap_zpool_type, 0644);
> +module_param_cb(zpool, &zswap_zpool_param_ops, &zswap_zpool_type, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
>  
>  /* The maximum percentage of memory that the compressed pool can occupy */
>  static unsigned int zswap_max_pool_percent = 20;
> -module_param_named(max_pool_percent, zswap_max_pool_percent, uint, 0644);
> +module_param_named(max_pool_percent, zswap_max_pool_percent, uint, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
>  
>  /*********************************
>  * data structures

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