Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Message-ID: <1589360744.14554.10.camel@mtksdccf07>
Subject: Re: [PATCH v2 1/3] rcu/kasan: record and print call_rcu() call stack
From:   Walter Wu <walter-zh.wu@mediatek.com>
To:     Dmitry Vyukov <dvyukov@google.com>
CC:     Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Alexander Potapenko <glider@google.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        "Paul E . McKenney" <paulmck@kernel.org>,
        Josh Triplett <josh@joshtriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Lai Jiangshan <jiangshanlai@gmail.com>,
        Joel Fernandes <joel@joelfernandes.org>,
        "Andrew Morton" <akpm@linux-foundation.org>,
        kasan-dev <kasan-dev@googlegroups.com>,
        Linux-MM <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>,
        "Linux ARM" <linux-arm-kernel@lists.infradead.org>
Date:   Wed, 13 May 2020 17:05:44 +0800
In-Reply-To: <CACT4Y+Zv3rCZs8z56NHM0hHWMwQr_2AT8nx0vUigzMG2v3Rt8Q@mail.gmail.com>
References: <20200511023111.15310-1-walter-zh.wu@mediatek.com>
         <CACT4Y+YWNwTSoheJhc3nMdQi9m719F3PzpGo3TfRY3zAg9EwuQ@mail.gmail.com>
         <CACT4Y+bO1Zg_jgFHbOWgp7fLAADOQ_-AZmjEHz0WG7=oyOt4Gg@mail.gmail.com>
         <1589203771.21284.22.camel@mtksdccf07>
         <CACT4Y+aOkuH6Dn+L+wv1qVOLgXyCY_Ck4hecAMw3DgyBgC9qHw@mail.gmail.com>
         <1589254720.19238.36.camel@mtksdccf07>
         <CACT4Y+aibZEBR-3bos3ox5Tuu48TnHC20mDDN0AkWeRUKrT0aw@mail.gmail.com>
         <1589334472.19238.44.camel@mtksdccf07>
         <CACT4Y+Zv3rCZs8z56NHM0hHWMwQr_2AT8nx0vUigzMG2v3Rt8Q@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
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