linux-kernel - Re: [PATCH v6 3/4] pwm: bcm2835: allow pwm driver to be used in atomic context

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Date:   Fri, 8 Dec 2023 17:01:26 +0000
From:   Sean Young <sean@...s.org>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     linux-media@...r.kernel.org, linux-pwm@...r.kernel.org,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 3/4] pwm: bcm2835: allow pwm driver to be used in
 atomic context

On Fri, Dec 08, 2023 at 05:22:52PM +0100, Thierry Reding wrote:
> On Wed, Nov 29, 2023 at 09:13:36AM +0000, Sean Young wrote:
> > clk_get_rate() may do a mutex lock. Fetch the clock rate once, and prevent
> > rate changes using clk_rate_exclusive_get().
> > 
> > Signed-off-by: Sean Young <sean@...s.org>
> > ---
> >  drivers/pwm/pwm-bcm2835.c | 31 +++++++++++++++++++++----------
> >  1 file changed, 21 insertions(+), 10 deletions(-)
> 
> s/pwm/PWM/ in the subject. Although, I guess you could just drop the
> "PWM" altogether because the subject prefix implies that this is for
> PWM.

$ git log --no-merges --oneline drivers/pwm/ | sed -r 's/^\w* ([^:]+): .*/\1/' | sort | uniq -c
   1197 pwm
      1 PWM
  ...

The vast majority of the commits use pwm: as a prefix, only one uses PWM:. 
In fact if you look across the tree almost everywhere lower case is used
for the prefix.

I'm just trying to follow convention.

Having said that, I think the prefix is totally redundant, it is clear from
the commit files what they are affecting. I am not sure what it really adds.

> Also, please capitalize after the subject prefix.

$ git log --no-merges --oneline drivers/pwm/ | grep -E '^\w* ([^:]+): [A-Z]' | wc -l
217
$ git log --no-merges --oneline drivers/pwm/ | grep -E '^\w* ([^:]+): [a-z]' | wc -l
1069

Although not as clear, convention seems to be lower case for commits. The
first line of a commit is not really a sentence, there is no trailing
period.

I am happy to oblige, just wanted to point this out. Sorry if this starts
a bikeshed discussion.

Thanks,

Sean