linux-kernel - Re: [PATCH] staging: greybus: loopback: enclose macro statements in do-while loop

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Date:   Sun, 16 Oct 2022 20:32:37 +0530
From:   Deepak R Varma <drv@...lo.com>
To:     Julia Lawall <julia.lawall@...ia.fr>
Cc:     outreachy@...ts.linux.dev, pure.logic@...us-software.ie,
        johan@...nel.org, elder@...nel.org, gregkh@...uxfoundation.org,
        greybus-dev@...ts.linaro.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: greybus: loopback: enclose macro statements in
 do-while loop

On Sun, Oct 16, 2022 at 04:51:09PM +0200, Julia Lawall wrote:
>
>
> On Sun, 16 Oct 2022, Deepak R Varma wrote:
>
> > Include multiple statements of macro definition inside do-while{0} loop
> > to avoid possible partial program execution. Issue reported by
> > checkpatch script:
> >
> > ERROR: Macros with multiple statements should be enclosed in a do - while loop
>
> I don't think this change will compile.  See if you can figure out why
> not.

It did compile. I built the greybus driver and loaded it as well with the
modinfo tool. Can you please tell why you think it won't compile?

./drv

>
> julia
>
> >
> > Signed-off-by: Deepak R Varma <drv@...lo.com>
> > ---
> >  drivers/staging/greybus/loopback.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c
> > index 1a61fce98056..37214cb43937 100644
> > --- a/drivers/staging/greybus/loopback.c
> > +++ b/drivers/staging/greybus/loopback.c
> > @@ -163,9 +163,11 @@ static ssize_t name##_avg_show(struct device *dev,		\
> >  static DEVICE_ATTR_RO(name##_avg)
> >
> >  #define gb_loopback_stats_attrs(field)				\
> > +do {								\
> >  	gb_loopback_ro_stats_attr(field, min, u);		\
> >  	gb_loopback_ro_stats_attr(field, max, u);		\
> > -	gb_loopback_ro_avg_attr(field)
> > +	gb_loopback_ro_avg_attr(field);				\
> > +} while (0)
> >
> >  #define gb_loopback_attr(field, type)					\
> >  static ssize_t field##_show(struct device *dev,				\
> > --
> > 2.30.2
> >
> >
> >
> >
> >