Generic KASAN will support to record first and last call_rcu() call stack and print them in KASAN report. so we update documentation. Signed-off-by: Walter Wu <walter-zh.wu@xxxxxxxxxxxx> Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Cc: Alexander Potapenko <glider@xxxxxxxxxx> Cc: Jonathan Corbet <corbet@xxxxxxx> --- Documentation/dev-tools/kasan.rst | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst index c652d740735d..d4efcfde9fff 100644 --- a/Documentation/dev-tools/kasan.rst +++ b/Documentation/dev-tools/kasan.rst @@ -193,6 +193,12 @@ function calls GCC directly inserts the code to check the shadow memory. This option significantly enlarges kernel but it gives x1.1-x2 performance boost over outline instrumented kernel. +Currently generic KASAN can print call_rcu() call stack in KASAN report, it +can't increase the cost of memory consumption, but it has one limitations. +It can't get both call_rcu() call stack and free stack, so that it can't +print free stack for allocation objects in KASAN report. This feature is +only suitable for generic KASAN. + Software tag-based KASAN ~~~~~~~~~~~~~~~~~~~~~~~~ -- 2.18.0
