3 files changed, 32 insertions, 9 deletions

diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h
index 387571959dd9..6883e197acb9 100644
--- a/include/linux/kallsyms.h
+++ b/include/linux/kallsyms.h
@@ -36,6 +36,7 @@ const char *kallsyms_lookup(unsigned long addr,
 
 /* Look up a kernel symbol and return it in a text buffer. */
 extern int sprint_symbol(char *buffer, unsigned long address);
+extern int sprint_symbol_no_offset(char *buffer, unsigned long address);
 extern int sprint_backtrace(char *buffer, unsigned long address);
 
 /* Look up a kernel symbol and print it to the kernel messages. */
@@ -80,6 +81,12 @@ static inline int sprint_symbol(char *buffer, unsigned long addr)
         return 0;
 }
 
+static inline int sprint_symbol_no_offset(char *buffer, unsigned long addr)
+{
+        *buffer = '\0';
+        return 0;
+}
+
 static inline int sprint_backtrace(char *buffer, unsigned long addr)
 {
         *buffer = '\0';
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 079f1d39a8b8..2169feeba529 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -343,7 +343,7 @@ int lookup_symbol_attrs(unsigned long addr, unsigned long *size,
 
 /* Look up a kernel symbol and return it in a text buffer. */
 static int __sprint_symbol(char *buffer, unsigned long address,
-                           int symbol_offset)
+                           int symbol_offset, int add_offset)
 {
         char *modname;
         const char *name;
@@ -358,13 +358,13 @@ static int __sprint_symbol(char *buffer, unsigned long address,
         if (name != buffer)
                 strcpy(buffer, name);
         len = strlen(buffer);
-        buffer += len;
         offset -= symbol_offset;
 
+        if (add_offset)
+                len += sprintf(buffer + len, "+%#lx/%#lx", offset, size);
+
         if (modname)
-                len += sprintf(buffer, "+%#lx/%#lx [%s]", offset, size, modname);
-        else
-                len += sprintf(buffer, "+%#lx/%#lx", offset, size);
+                len += sprintf(buffer + len, " [%s]", modname);
 
         return len;
 }
@@ -382,12 +382,28 @@ static int __sprint_symbol(char *buffer, unsigned long address,
  */
 int sprint_symbol(char *buffer, unsigned long address)
 {
-        return __sprint_symbol(buffer, address, 0);
+        return __sprint_symbol(buffer, address, 0, 1);
 }
-
 EXPORT_SYMBOL_GPL(sprint_symbol);
 
 /**
+ * sprint_symbol_no_offset - Look up a kernel symbol and return it in a text buffer
+ * @buffer: buffer to be stored
+ * @address: address to lookup
+ *
+ * This function looks up a kernel symbol with @address and stores its name
+ * and module name to @buffer if possible. If no symbol was found, just saves
+ * its @address as is.
+ *
+ * This function returns the number of bytes stored in @buffer.
+ */
+int sprint_symbol_no_offset(char *buffer, unsigned long address)
+{
+        return __sprint_symbol(buffer, address, 0, 0);
+}
+EXPORT_SYMBOL_GPL(sprint_symbol_no_offset);
+
+/**
  * sprint_backtrace - Look up a backtrace symbol and return it in a text buffer
  * @buffer: buffer to be stored
  * @address: address to lookup
@@ -403,7 +419,7 @@ EXPORT_SYMBOL_GPL(sprint_symbol);
  */
 int sprint_backtrace(char *buffer, unsigned long address)
 {
-        return __sprint_symbol(buffer, address, -1);
+        return __sprint_symbol(buffer, address, -1, 1);
 }
 
 /* Look up a kernel symbol and print it to the kernel messages. */
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index abbabec9720a..f5dfe0ca34f6 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -436,7 +436,7 @@ char *symbol_string(char *buf, char *end, void *ptr,
         else if (ext != 'f' && ext != 's')
                 sprint_symbol(sym, value);
         else
-                kallsyms_lookup(value, NULL, NULL, NULL, sym);
+                sprint_symbol_no_offset(sym, value);
 
         return string(buf, end, sym, spec);
 #else