1 files changed, 7 insertions, 0 deletions

diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt
index 6da24e7a56cb..4303e0c12476 100644
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@@ -245,6 +245,13 @@ Debugging
                 newfallback: use new unwinder but fall back to old if it gets
                         stuck (default)
 
+  call_trace=[old|both|newfallback|new]
+                old: use old inexact backtracer
+                new: use new exact dwarf2 unwinder
+                both: print entries from both
+                newfallback: use new unwinder but fall back to old if it gets
+                        stuck (default)
+
 Misc
 
   noreplacement  Don't replace instructions with more appropriate ones