1 files changed, 22 insertions, 0 deletions

diff --git a/arch/x86/boot/string.c b/arch/x86/boot/string.c
index aba29df4a7bb..3cbc4058dd26 100644
--- a/arch/x86/boot/string.c
+++ b/arch/x86/boot/string.c
@@ -68,10 +68,32 @@ unsigned int atou(const char *s)
 /* Works only for digits and letters, but small and fast */
 #define TOLOWER(x) ((x) | 0x20)
 
+static unsigned int simple_guess_base(const char *cp)
+{
+        if (cp[0] == '0') {
+                if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
+                        return 16;
+                else
+                        return 8;
+        } else {
+                return 10;
+        }
+}
+
+/**
+ * simple_strtoull - convert a string to an unsigned long long
+ * @cp: The start of the string
+ * @endp: A pointer to the end of the parsed string will be placed here
+ * @base: The number base to use
+ */
+
 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
 {
         unsigned long long result = 0;
 
+        if (!base)
+                base = simple_guess_base(cp);
+
         if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
                 cp += 2;