diff --git a/fs/nls/nls_koi8-u.c b/fs/nls/nls_koi8-u.c
index 0150702..8c9f029 100644
--- a/fs/nls/nls_koi8-u.c
+++ b/fs/nls/nls_koi8-u.c
@@ -11,7 +11,7 @@
 #include <linux/nls.h>
 #include <linux/errno.h>
 
-static wchar_t charset2uni[256] = {
+static const wchar_t charset2uni[256] = {
 	/* 0x00*/
 	0x0000, 0x0001, 0x0002, 0x0003,
 	0x0004, 0x0005, 0x0006, 0x0007,
@@ -94,7 +94,7 @@
 	0x042d, 0x0429, 0x0427, 0x042a,
 };
 
-static unsigned char page00[256] = {
+static const unsigned char page00[256] = {
 	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
 	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
 	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
@@ -129,7 +129,7 @@
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x9f, /* 0xf0-0xf7 */
 };
 
-static unsigned char page04[256] = {
+static const unsigned char page04[256] = {
 	0x00, 0xb3, 0x00, 0x00, 0xb4, 0x00, 0xb6, 0xb7, /* 0x00-0x07 */
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x08-0x0f */
 	0xe1, 0xe2, 0xf7, 0xe7, 0xe4, 0xe5, 0xf6, 0xfa, /* 0x10-0x17 */
@@ -152,7 +152,7 @@
 	0xbd, 0xad, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x90-0x97 */
 };
 
-static unsigned char page22[256] = {
+static const unsigned char page22[256] = {
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x00-0x07 */
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x08-0x0f */
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10-0x17 */
@@ -168,7 +168,7 @@
 	0x00, 0x00, 0x00, 0x00, 0x98, 0x99, 0x00, 0x00, /* 0x60-0x67 */
 };
 
-static unsigned char page23[256] = {
+static const unsigned char page23[256] = {
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x00-0x07 */
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x08-0x0f */
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x10-0x17 */
@@ -176,7 +176,7 @@
 	0x93, 0x9b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x20-0x27 */
 };
 
-static unsigned char page25[256] = {
+static const unsigned char page25[256] = {
 	0x80, 0x00, 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x00-0x07 */
 	0x00, 0x00, 0x00, 0x00, 0x82, 0x00, 0x00, 0x00, /* 0x08-0x0f */
 	0x83, 0x00, 0x00, 0x00, 0x84, 0x00, 0x00, 0x00, /* 0x10-0x17 */
@@ -201,7 +201,7 @@
 	0x94, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0xa0-0xa7 */
 };
 
-static unsigned char *page_uni2charset[256] = {
+static const unsigned char *const page_uni2charset[256] = {
 	page00, NULL,   NULL,   NULL,   page04, NULL,   NULL,   NULL,   
 	NULL,   NULL,   NULL,   NULL,   NULL,   NULL,   NULL,   NULL,   
 	NULL,   NULL,   NULL,   NULL,   NULL,   NULL,   NULL,   NULL,   
@@ -209,7 +209,7 @@
 	NULL,   NULL,   page22, page23, NULL,   page25, NULL,   NULL,   
 };
 
-static unsigned char charset2lower[256] = {
+static const unsigned char charset2lower[256] = {
 	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
 	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
 	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
@@ -245,7 +245,7 @@
 	0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xf8-0xff */
 };
 
-static unsigned char charset2upper[256] = {
+static const unsigned char charset2upper[256] = {
 	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
 	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
 	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
@@ -283,7 +283,7 @@
 
 static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
 {
-	unsigned char *uni2charset;
+	const unsigned char *uni2charset;
 	unsigned char cl = uni & 0x00ff;
 	unsigned char ch = (uni & 0xff00) >> 8;