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

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Message-ID: <CANpmjNOSKQi+wYbCVYqL-LriqCD37GtOfrArB0hyKysaPYyzGQ@mail.gmail.com>
Date:   Mon, 24 Aug 2020 13:46:25 +0200
From:   Marco Elver <elver@...gle.com>
To:     Walter Wu <walter-zh.wu@...iatek.com>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jonathan Corbet <corbet@....net>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        wsd_upstream <wsd_upstream@...iatek.com>,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 6/6] kasan: update documentation for generic kasan

On Mon, 24 Aug 2020 at 10:14, Walter Wu <walter-zh.wu@...iatek.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@...iatek.com>
> Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
> Cc: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: Alexander Potapenko <glider@...gle.com>
> Cc: Jonathan Corbet <corbet@....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