Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Content-Type: text/plain;
        charset=utf-8
Mime-Version: 1.0 (Mac OS X Mail 13.0 \(3608.60.0.2.5\))
Subject: Re: [PATCH] timer: silenct a lockdep splat with debugobjects
From:   Qian Cai <cai@lca.pw>
In-Reply-To: <47A499D0-D1F5-4B72-A99D-6FBC8E3DD8AD@lca.pw>
Date:   Mon, 23 Mar 2020 09:41:53 -0400
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        John Stultz <john.stultz@linaro.org>, sboyd@kernel.org,
        "Steven Rostedt (VMware)" <rostedt@goodmis.org>,
        hannes@cmpxchg.org, LKML <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>
Content-Transfer-Encoding: quoted-printable
Message-Id: <EBB4D2B4-1EDF-4EDF-B667-81FDFA1F4AF2@lca.pw>
References: <20200313154221.1566-1-cai@lca.pw>
 <20200313180811.GD12521@hirez.programming.kicks-ass.net>
 <4FFD109D-EAC1-486F-8548-AA1F5E024120@lca.pw>
 <20200313201314.GE5086@worktop.programming.kicks-ass.net>
 <D3115315-12A9-43A9-9209-09553CF2C71C@lca.pw>
 <20200313212620.GA2452@worktop.programming.kicks-ass.net>
 <47A499D0-D1F5-4B72-A99D-6FBC8E3DD8AD@lca.pw>
To:     Andy Lutomirski <luto@amacapital.net>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


> On Mar 13, 2020, at 10:53 PM, Qian Cai <cai@lca.pw> wrote:
>=20
>=20
>=20
>> On Mar 13, 2020, at 5:26 PM, Peter Zijlstra <peterz@infradead.org> =
wrote:
>>=20
>> On Fri, Mar 13, 2020 at 05:00:41PM -0400, Qian Cai wrote:
>>>> On Mar 13, 2020, at 4:13 PM, Peter Zijlstra <peterz@infradead.org> =
wrote:
>>=20
>>>>=20
>>>> Or, fix that random crud to do the wakeup outside of the lock.
>>>=20
>>> That is likely to be difficult until we can find a creative way to =
not =E2=80=9Cuglifying" the
>>> random code by dropping locks in the middle etc just because of =
debugojects.
>>=20
>> =
https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/log/?h=3Dra=
ndom/fast
>>=20
>> Doesn't look difficult at all.
>=20
> Great. I cherry-picked the first two patches,
>=20
> random: Consolidate entropy batches for u32 and u64
> random: Remove batched entropy locking
>=20
> which solved the issue here as well.
>=20
> Andy, may I ask what your plan to post those?

Andy, do you mind me posting those 2 patches to Ted on your behalf if =
you have
no plan to do this in the near future?