diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 945e063..b4d2f09 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -92,6 +92,7 @@
 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
 extern long simple_strtol(const char *,char **,unsigned int);
 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
+extern long long simple_strtoll(const char *,char **,unsigned int);
 
 /*
  * min()/max()/clamp() macros that also do
diff --git a/lib/strtox.c b/lib/strtox.c
index cfe6124..08d912e 100644
--- a/lib/strtox.c
+++ b/lib/strtox.c
@@ -65,3 +65,12 @@
 	return result;
 }
 EXPORT_SYMBOL(simple_strtoull);
+
+long long simple_strtoll(const char *cp, char **endp, unsigned int base)
+{
+	if (*cp == '-')
+		return -simple_strtoull(cp + 1, endp, base);
+
+	return simple_strtoull(cp, endp, base);
+}
+EXPORT_SYMBOL(simple_strtoll);