linux-kernel - Re: [PATCH] timer: silenct a lockdep splat with debugobjects

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Message-Id: <EBB4D2B4-1EDF-4EDF-B667-81FDFA1F4AF2@lca.pw>
Date:   Mon, 23 Mar 2020 09:41:53 -0400
From:   Qian Cai <cai@....pw>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        John Stultz <john.stultz@...aro.org>, sboyd@...nel.org,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        hannes@...xchg.org, LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] timer: silenct a lockdep splat with debugobjects



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