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-rw-r--r--Documentation/mm/slub.rst2
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diff --git a/Documentation/mm/slub.rst b/Documentation/mm/slub.rst
index 4e1578186b4f..7f652216dabe 100644
--- a/Documentation/mm/slub.rst
+++ b/Documentation/mm/slub.rst
@@ -116,6 +116,8 @@ options from the ``slub_debug`` parameter translate to the following files::
T trace
A failslab
+failslab file is writable, so writing 1 or 0 will enable or disable
+the option at runtime. Write returns -EINVAL if cache is an alias.
Careful with tracing: It may spew out lots of information and never stop if
used on the wrong slab.