2 files changed, 23 insertions, 3 deletions

diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index e727fe0d1451..4b6755984d24 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -58,12 +58,13 @@ struct bug_entry {
  */
 #ifndef __WARN
 #ifndef __ASSEMBLY__
-extern void warn_slowpath(const char *file, const int line,
+extern void warn_slowpath_fmt(const char *file, const int line,
                 const char *fmt, ...) __attribute__((format(printf, 3, 4)));
+extern void warn_slowpath_null(const char *file, const int line);
 #define WANT_WARN_ON_SLOWPATH
 #endif
-#define __WARN()                warn_slowpath(__FILE__, __LINE__, NULL)
-#define __WARN_printf(arg...)   warn_slowpath(__FILE__, __LINE__, arg)
+#define __WARN()                warn_slowpath_null(__FILE__, __LINE__)
+#define __WARN_printf(arg...)   warn_slowpath_fmt(__FILE__, __LINE__, arg)
 #else
 #define __WARN_printf(arg...)   do { printk(arg); __WARN(); } while (0)
 #endif
diff --git a/include/linux/nls.h b/include/linux/nls.h
index 6a882208301a..52b1a76c1b43 100644
--- a/include/linux/nls.h
+++ b/include/linux/nls.h
@@ -58,6 +58,25 @@ static inline int nls_strnicmp(struct nls_table *t, const unsigned char *s1,
         return 0;
 }
 
+/*
+ * nls_nullsize - return length of null character for codepage
+ * @codepage - codepage for which to return length of NULL terminator
+ *
+ * Since we can't guarantee that the null terminator will be a particular
+ * length, we have to check against the codepage. If there's a problem
+ * determining it, assume a single-byte NULL terminator.
+ */
+static inline int
+nls_nullsize(const struct nls_table *codepage)
+{
+        int charlen;
+        char tmp[NLS_MAX_CHARSET_SIZE];
+
+        charlen = codepage->uni2char(0, tmp, NLS_MAX_CHARSET_SIZE);
+
+        return charlen > 0 ? charlen : 1;
+}
+
 #define MODULE_ALIAS_NLS(name)  MODULE_ALIAS("nls_" __stringify(name))
 
 #endif /* _LINUX_NLS_H */