linux-kernel - Re: [PATCH] fpga: dfl: fme: Constify static attribute

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Message-ID: <X/ozuAn64pe71rh+@rikard>
Date:   Sat, 9 Jan 2021 23:52:40 +0100
From:   Rikard Falkeborn <rikard.falkeborn@...il.com>
To:     Tom Rix <trix@...hat.com>
Cc:     Rikard Falkeborn <rikard.falkeborn@...il.com>,
        Wu Hao <hao.wu@...el.com>, Moritz Fischer <mdf@...nel.org>,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fpga: dfl: fme: Constify static attribute_group structs

On Sat, Jan 09, 2021 at 01:55:13PM -0800, Tom Rix wrote:
> 
> On 1/8/21 3:54 PM, Rikard Falkeborn wrote:
> > The only usage of these is to put their addresses in arrays of pointers
> > to const attribute_groups. Make them const to allow the compiler to put
> > them in read-only memory.
> >
> > Signed-off-by: Rikard Falkeborn <rikard.falkeborn@...il.com>
> > ---
> >  drivers/fpga/dfl-fme-perf.c | 6 +++---
> 
> This looks ok.
> 
> There are other 'static struct's in drivers/fpga.
> 
> Why is the change limited to this file ?
> 
> Tom
> 

I have a WIP coccinelle script to constify static struct attribute_group
and this is the only file in drivers/fpga which has non-const struct
attribute_group, that's why it's limited to this file. I could have
mentioned that in the commit message.

Rikard


> >  1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/fpga/dfl-fme-perf.c b/drivers/fpga/dfl-fme-perf.c
> > index 531266287eee..4299145ef347 100644
> > --- a/drivers/fpga/dfl-fme-perf.c
> > +++ b/drivers/fpga/dfl-fme-perf.c
> > @@ -192,7 +192,7 @@ static struct attribute *fme_perf_cpumask_attrs[] = {
> >  	NULL,
> >  };
> >  
> > -static struct attribute_group fme_perf_cpumask_group = {
> > +static const struct attribute_group fme_perf_cpumask_group = {
> >  	.attrs = fme_perf_cpumask_attrs,
> >  };
> >  
> > @@ -225,7 +225,7 @@ static struct attribute *fme_perf_format_attrs[] = {
> >  	NULL,
> >  };
> >  
> > -static struct attribute_group fme_perf_format_group = {
> > +static const struct attribute_group fme_perf_format_group = {
> >  	.name = "format",
> >  	.attrs = fme_perf_format_attrs,
> >  };
> > @@ -239,7 +239,7 @@ static struct attribute *fme_perf_events_attrs_empty[] = {
> >  	NULL,
> >  };
> >  
> > -static struct attribute_group fme_perf_events_group = {
> > +static const struct attribute_group fme_perf_events_group = {
> >  	.name = "events",
> >  	.attrs = fme_perf_events_attrs_empty,
> >  };
>