linux-kernel - Re: [PATCH v2 5/8] mtd: maps: gpio-addr-flash: Replace array with an integer

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Date:   Mon, 1 Oct 2018 14:32:19 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        linux-mtd@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 5/8] mtd: maps: gpio-addr-flash: Replace array with
 an integer

On Mon, 1 Oct 2018 14:10:03 +0200
Ricardo Ribalda Delgado <ricardo.ribalda@...il.com> wrote:

> > > +             return;
> > > +
> > > +     for (i = 0; i < state->gpio_count; i++) {
> > > +             if ((ofs & BIT(i)) == (state->gpio_values & BIT(i)))  
> >
> > Parens around the xx & BIT(i) operations are unneeded.  
> 
> If I remove it:
> 
> 
> ricardo@...pili:~/curro/kernel-upstream$ make drivers/mtd/maps/gpio-addr-flash.o
>   CALL    scripts/checksyscalls.sh
>   DESCEND  objtool
>   CC      drivers/mtd/maps/gpio-addr-flash.o
> drivers/mtd/maps/gpio-addr-flash.c: In function ‘gf_set_gpios’:
> drivers/mtd/maps/gpio-addr-flash.c:70:20: warning: suggest parentheses
> around comparison in operand of ‘&’ [-Wparentheses]
>    if (ofs & BIT(i) == (state->gpio_values & BIT(i)))

Hm, okay. I remember having a similar discussion on one of my patch and
people suggesting to drop it because of the == precedence on x & a.
Anyway, let's just keep it like that.