linux-kernel - Re: [RFC][PATCH v2 04/31] timers: block: Use del_timer

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Date:   Fri, 28 Oct 2022 08:11:27 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Philipp Reisner <philipp.reisner@...bit.com>,
        Lars Ellenberg <lars.ellenberg@...bit.com>,
        Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>, drbd-dev@...ts.linbit.com,
        Tejun Heo <tj@...nel.org>, cgroups@...r.kernel.org,
        linux-block@...r.kernel.org
Subject: Re: [RFC][PATCH v2 04/31] timers: block: Use del_timer_shutdown()
 before freeing timer

On 10/28/22 8:06 AM, Steven Rostedt wrote:
> On Fri, 28 Oct 2022 07:56:50 -0600
> Jens Axboe <axboe@...nel.dk> wrote:
> 
>> On 10/28/22 4:24 AM, Steven Rostedt wrote:
>>> On Fri, 28 Oct 2022 01:26:03 -0700
>>> Christoph Hellwig <hch@...radead.org> wrote:
>>>   
>>>> This is just a single patch out of apparently 31, which claims that
>>>> something that doesn't even exist in mainline must be used without any
>>>> explanation.  How do you expect anyone to be able to review it?  
>>>
>>>   https://lore.kernel.org/all/20221027150525.753064657@goodmis.org/
>>>
>>> Only the first patch is relevant to you. I guess the Cc list would have
>>> been too big to Cc everyone that was Cc'd in the series.  
>>
>> No it's not, because how on earth would anyone know what the change does
>> if you only see the simple s/name/newname change? The patch is useless
>> by itself.
>>
> 
> I meant this as the first patch:
> 
>   https://lore.kernel.org/all/20221027150925.248421571@goodmis.org/
> 
> Which was what the link above was suppose to point to.
> 
> It's the only patch relevant to the rest of the series, as the rest is just
> converting over to the shutdown API, and the last patch changes
> DEBUG_OBJECTS_TIMERS to catch if this was done properly.
> 
> That is, patch 01/31 and the patch you were Cc'd on is relevant, and for
> those that want to look deeper, see patch 31 as well.

So we got half of what was needed to make any kind of sense of judgement
on the patch.

> But if I included the Cc list for patch 01 for all those Cc'd in the
> entire series, it would be a huge Cc list, so I avoided doing so.

And my point is that just CC'ing the relevant list for patch 4/31 is
useless. Do we need to see the whole series? No. Does everyone need to
see patch 1/31? Yes, very much so. Without that, 4/31 means nothing.

This is pretty common for tree wide changes. The relevant lists need
to see the full context, patch 4/31 by itself is useless and may as well
not be sent at this point then.

-- 
Jens Axboe