linux-kernel - Re: [PATCH v2 6/6] workqueue, kasan: avoid alloc

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Date:   Mon, 13 Sep 2021 19:58:39 +0200
From:   Marco Elver <elver@...gle.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Walter Wu <walter-zh.wu@...iatek.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vijayanand Jitta <vjitta@...eaurora.org>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Aleksandr Nogikh <nogikh@...gle.com>,
        Taras Madan <tarasmadan@...gle.com>
Subject: Re: [PATCH v2 6/6] workqueue, kasan: avoid alloc_pages() when
 recording stack

On Mon, 13 Sept 2021 at 19:03, Tejun Heo <tj@...nel.org> wrote:
>
> On Mon, Sep 13, 2021 at 01:26:09PM +0200, Marco Elver wrote:
> > While there is an increased risk of failing to insert the stack trace,
> > this is typically unlikely, especially if the same insertion had already
> > succeeded previously (stack depot hit). For frequent calls from the same
> > location, it therefore becomes extremely unlikely that
> > kasan_record_aux_stack_noalloc() fails.
> >
> > Link: https://lkml.kernel.org/r/20210902200134.25603-1-skhan@linuxfoundation.org
> > Reported-by: Shuah Khan <skhan@...uxfoundation.org>
> > Signed-off-by: Marco Elver <elver@...gle.com>
> > Tested-by: Shuah Khan <skhan@...uxfoundation.org>
> > Acked-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
>
> Acked-by: Tejun Heo <tj@...nel.org>

Thanks!

> Please feel free to route with the rest of series or if you want me to take
> these through the wq tree, please let me know.

Usually KASAN & stackdepot patches go via the -mm tree. I hope the
1-line change to workqueue won't conflict with other changes pending
in the wq tree. Unless you or Andrew tells us otherwise, I assume
these will at some point appear in -mm.

Thanks,
-- Marco

> Thanks.
>
> --
> tejun