[PATCH v2 6/6] kasan: update documentation for generic kasan

[PATCH v2 6/6] kasan: update documentation for generic kasan

[Walter Wu]

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

Signed-off-by: Walter Wu <walter-zh.wu@mediatek.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
---
 Documentation/dev-tools/kasan.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst
index fede42e6536b..5a4c5da8bda8 100644
--- a/Documentation/dev-tools/kasan.rst
+++ b/Documentation/dev-tools/kasan.rst
@@ -193,8 +193,8 @@ 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 prints up to 2 call_rcu() call stacks, timer queueing stacks,
+or workqueue queueing stacks in reports, the last one and the second to last.
 
 Software tag-based KASAN
 ~~~~~~~~~~~~~~~~~~~~~~~~
-- 
2.18.0

Re: [PATCH v2 6/6] kasan: update documentation for generic kasan

[Marco Elver]

On Mon, 24 Aug 2020 at 10:14, Walter Wu <walter-zh.wu@mediatek.com> wrote:
>
> Generic KASAN support to record the last two timer and workqueue
> stacks and print them in KASAN report. So that need to update
> documentation.
>
> Signed-off-by: Walter Wu <walter-zh.wu@mediatek.com>
> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
> Cc: Dmitry Vyukov <dvyukov@google.com>
> Cc: Alexander Potapenko <glider@google.com>
> Cc: Jonathan Corbet <corbet@lwn.net>
> ---
>  Documentation/dev-tools/kasan.rst | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst
> index fede42e6536b..5a4c5da8bda8 100644
> --- a/Documentation/dev-tools/kasan.rst
> +++ b/Documentation/dev-tools/kasan.rst
> @@ -193,8 +193,8 @@ 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 prints up to 2 call_rcu() call stacks, timer queueing stacks,
> +or workqueue queueing stacks in reports, the last one and the second to last.

We could make this more readable by writing something like this:

"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(), timer and workqueue queuing."

Thanks,
-- Marco