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Date:   Fri, 22 May 2020 10:02:12 +0800
From:   Walter Wu <>
To:     Andrey Ryabinin <>,
        Alexander Potapenko <>,
        Dmitry Vyukov <>,
        Jonathan Corbet <>
CC:     <>, <>,
        wsd_upstream <>,
        Walter Wu <>
Subject: [PATCH v6 4/4] kasan: update documentation for generic kasan

Generic KASAN will support to record the last two call_rcu() call stacks
and print them in KASAN report. So that need to update documentation.

Signed-off-by: Walter Wu <>
Cc: Andrey Ryabinin <>
Cc: Dmitry Vyukov <>
Cc: Alexander Potapenko <>
Cc: Jonathan Corbet <>
 Documentation/dev-tools/kasan.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst
index c652d740735d..fede42e6536b 100644
--- a/Documentation/dev-tools/kasan.rst
+++ b/Documentation/dev-tools/kasan.rst
@@ -193,6 +193,9 @@ 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.
+Generic KASAN prints up to 2 call_rcu() call stacks in reports, the last one
+and the second to last.
 Software tag-based KASAN

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