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-rw-r--r--Documentation/dev-tools/kasan.rst9
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diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst
index ddf4239a5890..6f6ab3ed7b79 100644
--- a/Documentation/dev-tools/kasan.rst
+++ b/Documentation/dev-tools/kasan.rst
@@ -161,6 +161,15 @@ particular KASAN features.
- ``kasan=off`` or ``=on`` controls whether KASAN is enabled (default: ``on``).
+- ``kasan.mode=sync`` or ``=async`` controls whether KASAN is configured in
+ synchronous or asynchronous mode of execution (default: ``sync``).
+ Synchronous mode: a bad access is detected immediately when a tag
+ check fault occurs.
+ Asynchronous mode: a bad access detection is delayed. When a tag check
+ fault occurs, the information is stored in hardware (in the TFSR_EL1
+ register for arm64). The kernel periodically checks the hardware and
+ only reports tag faults during these checks.
+
- ``kasan.stacktrace=off`` or ``=on`` disables or enables alloc and free stack
traces collection (default: ``on``).