netdev - Re: [PATCH net-next 1/3] net: provide macros for commonly copied lockless queue stop/wake code

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Message-ID: <fccbd0cc-f760-4f1a-8830-64a245b228dc@lunn.ch>
Date:   Thu, 23 Mar 2023 22:02:29 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com,
        pabeni@...hat.com, willemb@...gle.com, alexander.duyck@...il.com,
        michael.chan@...adcom.com, intel-wired-lan@...ts.osuosl.org,
        anthony.l.nguyen@...el.com, jesse.brandeburg@...el.com
Subject: Re: [PATCH net-next 1/3] net: provide macros for commonly copied
 lockless queue stop/wake code

On Wed, Mar 22, 2023 at 06:04:06PM -0700, Jakub Kicinski wrote:
> CC: maintainers, in case there isn't a repost
> https://lore.kernel.org/all/20230322233028.269410-1-kuba@kernel.org/
> 
> On Thu, 23 Mar 2023 01:35:34 +0100 Andrew Lunn wrote:
> > On Wed, Mar 22, 2023 at 04:30:26PM -0700, Jakub Kicinski wrote:
> > > A lot of drivers follow the same scheme to stop / start queues
> > > without introducing locks between xmit and NAPI tx completions.
> > > I'm guessing they all copy'n'paste each other's code.
> > >
> > > Smaller drivers shy away from the scheme and introduce a lock
> > > which may cause deadlocks in netpoll.  
> > 
> > I notice there is no patch 0/X. Seems like the above would be good
> > material for it, along with a comment that a few drivers are converted
> > to make use of the new macros.
> 
> Then do I repeat the same text in the commit? Or cut the commit down?
> Doesn't that just take away information from the commit which will
> show up in git blame?
> 
> Having a cover letter is a good default, and required if the series 
> is a larger change decomposed into steps. But here there is a major
> change and a bunch of loose conversions. More sample users than
> meaningful part.
> 
> LMK what your preference for splitting this info is, I'm unsure.

We do seem to have a policy of asking for a 0/X. And it is used for
the merge commit. That is my real point. And i don't see why the text
can be repeated in the merge commit and the individual commits.

    Andrew