linux-kernel - [PATCH v5 4/4] kasan: update documentation for generic kasan

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Message-ID: <20201203023037.30792-1-walter-zh.wu@mediatek.com>
Date:   Thu, 3 Dec 2020 10:30:37 +0800
From:   Walter Wu <walter-zh.wu@...iatek.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>,
        Marco Elver <elver@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     <kasan-dev@...glegroups.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        wsd_upstream <wsd_upstream@...iatek.com>,
        <linux-mediatek@...ts.infradead.org>,
        Walter Wu <walter-zh.wu@...iatek.com>
Subject: [PATCH v5 4/4] kasan: update documentation for generic kasan

Generic KASAN also supports to record the last two workqueue
stacks and print them in KASAN report. So that need to update
documentation.

Signed-off-by: Walter Wu <walter-zh.wu@...iatek.com>
Suggested-by: Marco Elver <elver@...gle.com>
Acked-by: Marco Elver <elver@...gle.com>
Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>
Reviewed-by: Andrey Konovalov <andreyknvl@...gle.com>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Jonathan Corbet <corbet@....net>
---

v4:
- remove timer stack description

v3:
- Thanks for Marco suggestion

---
 Documentation/dev-tools/kasan.rst | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst
index c09c9ca2ff1c..3cb556ceb4a5 100644
--- a/Documentation/dev-tools/kasan.rst
+++ b/Documentation/dev-tools/kasan.rst
@@ -190,8 +190,9 @@ 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.
+Generic KASAN also reports the last 2 call stacks to creation of work that
+potentially has access to an object. Call stacks for the following are shown:
+call_rcu() and workqueue queuing.
 
 Software tag-based KASAN
 ~~~~~~~~~~~~~~~~~~~~~~~~
-- 
2.18.0