--- zzzz-none-000/linux-3.10.107/arch/tile/include/asm/string.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/tile/include/asm/string.h	2021-02-04 17:41:59.000000000 +0000
@@ -21,8 +21,10 @@
 #define __HAVE_ARCH_MEMMOVE
 #define __HAVE_ARCH_STRCHR
 #define __HAVE_ARCH_STRLEN
+#define __HAVE_ARCH_STRNLEN
 
 extern __kernel_size_t strlen(const char *);
+extern __kernel_size_t strnlen(const char *, __kernel_size_t);
 extern char *strchr(const char *s, int c);
 extern void *memchr(const void *s, int c, size_t n);
 extern void *memset(void *, int, __kernel_size_t);