linux-kernel - Re: [PATCH] pwm: core: Use octal permission

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Date:   Wed, 18 Nov 2020 08:51:13 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Soham Biswas <sohambiswas41@...il.com>
Cc:     thierry.reding@...il.com, u.kleine-koenig@...gutronix.de,
        linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pwm: core: Use octal permission

On Tue, 17 Nov 2020, Soham Biswas wrote:

> This fixes the following warning:
> 
> `drivers/pwm/core.c:1341: WARNING: Symbolic permissions 'S_IRUGO' are
> not preferred. Consider using octal permissions '0444'.`
> 
> generated by the following script:
> 
> `./scripts/checkpatch.pl --file --terse drivers/pwm/core.c`

Oh, it's a checkpatch.pl thing.

You should definitely quote the warning and describe where it came
from in the commit log.

Not entirely sure what that warning is the result of.  Probably as
they're sightly harder to read and easier to get wrong.  Still, I'll
let Thierry decide whether the patch itself is suitable for inclusion
into the PWM core.

> On Tue, 17 Nov 2020 at 23:42, Lee Jones <lee.jones@...aro.org> wrote:
> >
> > On Tue, 17 Nov 2020, Soham Biswas wrote:
> >
> > > Fixed Warning.
> >
> > Which warning does this fix?
> >
> > > Replaced symbolic permission 'S_IRUGO' with octal permission '0444'.
> >
> > This is semantically equivalent.
> >
> > Not sure what and/or how this fixes anything.
> >
> > > Signed-off-by: Soham Biswas <sohambiswas41@...il.com>
> > > ---
> > >  drivers/pwm/core.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
> > > index 1f16f5365d3c..a8eff4b3ee36 100644
> > > --- a/drivers/pwm/core.c
> > > +++ b/drivers/pwm/core.c
> > > @@ -1338,7 +1338,7 @@ DEFINE_SEQ_ATTRIBUTE(pwm_debugfs);
> > >
> > >  static int __init pwm_debugfs_init(void)
> > >  {
> > > -     debugfs_create_file("pwm", S_IFREG | S_IRUGO, NULL, NULL,
> > > +     debugfs_create_file("pwm", S_IFREG | 0444, NULL, NULL,
> > >                           &pwm_debugfs_fops);
> > >
> > >       return 0;
> >

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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