[PATCH] fat: remove unused fat_tolower() and use to_lower() instead

[PATCH] fat: remove unused fat_tolower() and use to_lower() instead

[George Hu]

The fat_tolower() function is redundant, as it is functionally
equivalent to the to_lower() macro defined in include/linux/ctype.h.

Signed-off-by: George Hu <integral@archlinux.org>
---
 fs/fat/dir.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index 92b091783966..4f46d2358185 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -18,6 +18,7 @@
 #include <linux/compat.h>
 #include <linux/uaccess.h>
 #include <linux/iversion.h>
+#include <linux/ctype.h>
 #include "fat.h"
 
 /*
@@ -33,11 +34,6 @@
 #define FAT_MAX_UNI_CHARS	((MSDOS_SLOTS - 1) * 13 + 1)
 #define FAT_MAX_UNI_SIZE	(FAT_MAX_UNI_CHARS * sizeof(wchar_t))
 
-static inline unsigned char fat_tolower(unsigned char c)
-{
-	return ((c >= 'A') && (c <= 'Z')) ? c+32 : c;
-}
-
 static inline loff_t fat_make_i_pos(struct super_block *sb,
 				    struct buffer_head *bh,
 				    struct msdos_dir_entry *de)
@@ -396,7 +392,7 @@ static int fat_parse_short(struct super_block *sb,
 					de->lcase & CASE_LOWER_BASE);
 		if (chl <= 1) {
 			if (!isvfat)
-				ptname[i] = nocase ? c : fat_tolower(c);
+				ptname[i] = nocase ? c : tolower(c);
 			i++;
 			if (c != ' ') {
 				name_len = i;
@@ -433,7 +429,7 @@ static int fat_parse_short(struct super_block *sb,
 		if (chl <= 1) {
 			k++;
 			if (!isvfat)
-				ptname[i] = nocase ? c : fat_tolower(c);
+				ptname[i] = nocase ? c : tolower(c);
 			i++;
 			if (c != ' ') {
 				name_len = i;
-- 
2.52.0

Re: [PATCH] fat: remove unused fat_tolower() and use to_lower() instead

[OGAWA Hirofumi]

George Hu <integral@archlinux.org> writes:

> The fat_tolower() function is redundant, as it is functionally
> equivalent to the to_lower() macro defined in include/linux/ctype.h.

No, it is not equivalent.

Thanks.

> Signed-off-by: George Hu <integral@archlinux.org>
> ---
>  fs/fat/dir.c | 10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/fs/fat/dir.c b/fs/fat/dir.c
> index 92b091783966..4f46d2358185 100644
> --- a/fs/fat/dir.c
> +++ b/fs/fat/dir.c
> @@ -18,6 +18,7 @@
>  #include <linux/compat.h>
>  #include <linux/uaccess.h>
>  #include <linux/iversion.h>
> +#include <linux/ctype.h>
>  #include "fat.h"
>  
>  /*
> @@ -33,11 +34,6 @@
>  #define FAT_MAX_UNI_CHARS	((MSDOS_SLOTS - 1) * 13 + 1)
>  #define FAT_MAX_UNI_SIZE	(FAT_MAX_UNI_CHARS * sizeof(wchar_t))
>  
> -static inline unsigned char fat_tolower(unsigned char c)
> -{
> -	return ((c >= 'A') && (c <= 'Z')) ? c+32 : c;
> -}
> -
>  static inline loff_t fat_make_i_pos(struct super_block *sb,
>  				    struct buffer_head *bh,
>  				    struct msdos_dir_entry *de)
> @@ -396,7 +392,7 @@ static int fat_parse_short(struct super_block *sb,
>  					de->lcase & CASE_LOWER_BASE);
>  		if (chl <= 1) {
>  			if (!isvfat)
> -				ptname[i] = nocase ? c : fat_tolower(c);
> +				ptname[i] = nocase ? c : tolower(c);
>  			i++;
>  			if (c != ' ') {
>  				name_len = i;
> @@ -433,7 +429,7 @@ static int fat_parse_short(struct super_block *sb,
>  		if (chl <= 1) {
>  			k++;
>  			if (!isvfat)
> -				ptname[i] = nocase ? c : fat_tolower(c);
> +				ptname[i] = nocase ? c : tolower(c);
>  			i++;
>  			if (c != ' ') {
>  				name_len = i;

-- 
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>