diff --git a/drivers/mxc/amd-gpu/common/gsl_memmgr.c b/drivers/mxc/amd-gpu/common/gsl_memmgr.c
index 65d9b868bb8..3c9a3df27ff 100644
--- a/drivers/mxc/amd-gpu/common/gsl_memmgr.c
+++ b/drivers/mxc/amd-gpu/common/gsl_memmgr.c
@@ -297,9 +297,9 @@ kgsl_memarena_create(int aperture_id, int mmu_virtualized, unsigned int hostbase
     // define unique mutex for each memory arena instance
     id_str[0] = (char) (count + '0');
     id_str[1] = '\0';
-    kos_strcpy(name, "GSL_memory_arena_");
-    len = kos_strlen(name);
-    kos_strcpy(&name[len], id_str);
+    strcpy(name, "GSL_memory_arena_");
+    len = strlen(name);
+    strcpy(&name[len], id_str);
 
     memarena->mutex = kos_mutex_create(name);
 
diff --git a/drivers/mxc/amd-gpu/os/kernel/include/kos_libapi.h b/drivers/mxc/amd-gpu/os/kernel/include/kos_libapi.h
index c85362eb321..e9b238ea363 100644
--- a/drivers/mxc/amd-gpu/os/kernel/include/kos_libapi.h
+++ b/drivers/mxc/amd-gpu/os/kernel/include/kos_libapi.h
@@ -161,79 +161,7 @@ KOS_API void            kos_enable_memoryleakcheck(void);
 KOS_API void            kos_memoryfence(void);
 
 
-//////////////////////////////////////////////////////////////////////////////
-//  string API
-//////////////////////////////////////////////////////////////////////////////
-/*-------------------------------------------------------------------*//*!
- * \external
- * \brief   Perform a string copy.
- *
- *
- * \param   void* strdestination    Pointer to destination memory.
- * \param   void* strsource     Pointer to the source string.
- * \return  Zero if ok, othervise an error code.
- *//*-------------------------------------------------------------------*/
-KOS_API char*           kos_strcpy(char* strdestination, const char* strsource);
-/*-------------------------------------------------------------------*//*!
- * \external
- * \brief   Perform a string copy with given length.
- *
- *
- * \param   void* destination   Pointer to destination memory.
- * \param   void* source        Pointer to the source string.
- * \param   int length          Amount of bytes to copy.
- * \return  Returns the destination pointer.
- *//*-------------------------------------------------------------------*/
-KOS_API char*           kos_strncpy(char* destination, const char* source, int length);
-/*-------------------------------------------------------------------*//*!
- * \external
- * \brief   Append source string to destination string.
- *
- *
- * \param   void* strdestination    Pointer to destination string.
- * \param   void* strsource         Pointer to the source string.
- * \return  Returns the destination pointer.
- *//*-------------------------------------------------------------------*/
-KOS_API char*           kos_strcat(char* strdestination, const char* strsource);
-/*-------------------------------------------------------------------*//*!
- * \external
- * \brief   Compare two strings.
- *
- *
- * \param   void* string1   Pointer to first string.
- * \param   void* string2   Pointer to second string.
- * \param   void* length    Number of bytes to compare.
- * \return  Zero if identical, >0 if first string is lexically greater <0 if not.
- *//*-------------------------------------------------------------------*/
-KOS_API int             kos_strcmp(const char* string1, const char* string2);
-/*-------------------------------------------------------------------*//*!
- * \external
- * \brief   Compares two strings of given length.
- *
- *
- * \param   void* string1   Pointer to first string.
- * \param   void* string2   Pointer to second string.
- * \param   void* length    Number of bytes to compare.
- * \return  Zero if identical, >0 if first string is lexically greater <0 if not.
- *//*-------------------------------------------------------------------*/
-KOS_API int             kos_strncmp(const char* string1, const char* string2, int length);
-/*-------------------------------------------------------------------*//*!
- * \external
- * \brief   Calculates the length of a string..
- *
- *
- * \param   void* string    Pointer to the string.
- * \return  Lenght of the string in bytes.
- *//*-------------------------------------------------------------------*/
-KOS_API int             kos_strlen(const char* string);
-/*-------------------------------------------------------------------*//*!
- * \external
- * \brief   Convert an numeric ascii string to integer value.
- *
- *
- * \param   void* string    Pointer to the string.
- * \return  Integer value extracted from the string.
- *//*-------------------------------------------------------------------*/
+
 KOS_API int             kos_atoi(const char* string);
 /*-------------------------------------------------------------------*//*!
  * \external
diff --git a/drivers/mxc/amd-gpu/os/kernel/src/linux/kos_lib.c b/drivers/mxc/amd-gpu/os/kernel/src/linux/kos_lib.c
index 1ef0037eebd..324649be7b4 100644
--- a/drivers/mxc/amd-gpu/os/kernel/src/linux/kos_lib.c
+++ b/drivers/mxc/amd-gpu/os/kernel/src/linux/kos_lib.c
@@ -146,67 +146,6 @@ kos_enable_memoryleakcheck(void)
     KOS_DBGFLAGS_SET(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
 }
 
-//////////////////////////////////////////////////////////////////////////////
-//  string API
-//////////////////////////////////////////////////////////////////////////////
-
-KOS_API char*
-kos_strcpy(char* strdestination, const char* strsource)
-{
-    KOS_ASSERT(strdestination);
-    KOS_ASSERT(strsource);
-    return strcpy(strdestination, strsource);
-}
-
-//----------------------------------------------------------------------------
-
-KOS_API char*
-kos_strncpy(char* destination, const char* source, int length)
-{
-    KOS_ASSERT(destination);
-    KOS_ASSERT(source);
-    return strncpy(destination, source, length);
-}
-
-//----------------------------------------------------------------------------
-
-KOS_API char*
-kos_strcat(char* strdestination, const char* strsource)
-{
-    KOS_ASSERT(strdestination);
-    KOS_ASSERT(strsource);
-    return strcat(strdestination, strsource);
-}
-
-//----------------------------------------------------------------------------
-
-KOS_API int
-kos_strcmp(const char* string1, const char* string2)
-{
-    KOS_ASSERT(string1);
-    KOS_ASSERT(string2);
-    return strcmp(string1, string2);
-}
-
-//----------------------------------------------------------------------------
-
-KOS_API int
-kos_strncmp(const char* string1, const char* string2, int length)
-{
-    KOS_ASSERT(string1);
-    KOS_ASSERT(string2);
-    return strncmp(string1, string2, length);
-}
-
-//----------------------------------------------------------------------------
-
-KOS_API int
-kos_strlen(const char* string)
-{
-    KOS_ASSERT(string);
-    return strlen(string);
-}
-
 //////////////////////////////////////////////////////////////////////////////
 //  sync API
 //////////////////////////////////////////////////////////////////////////////