linux-kernel - Re: [PATCH] staging: rtl8723bs: remove unused BIT macros definitions

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Date:   Fri, 30 Jul 2021 15:35:29 +0200
From:   Fabio Aiuto <fabioaiuto83@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     hdegoede@...hat.com, Larry.Finger@...inger.net,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        David Sterba <dsterba@...e.cz>
Subject: Re: [PATCH] staging: rtl8723bs: remove unused BIT macros definitions

Hello Greg,

On Fri, Jul 30, 2021 at 03:32:36PM +0200, Greg KH wrote:
> On Fri, Jul 30, 2021 at 03:21:03PM +0200, Fabio Aiuto wrote:
> > BIT(x) macro used all over the driver is defined in
> > include/vsdo/bit.h as
> > 
> > - #define BIT(nr)	(UL(1) << (nr))
> > 
> > which is safer than the local BIT macros declared.
> > Local macros shift a signed integer which brings
> > unespected results. For example:
> > 
> > (unsigned long)(1 << 31) => 0xffffffff80000000
> > 
> > shift.c:
> > 
> > int main() {
> >         printf("%lx\n", (unsigned long)(1 << 31));
> >         printf("%lx\n", (unsigned long)(1U << 31));
> >         return 0;
> > }
> > ---
> > 
> > $ ./shift
> > ffffffff80000000
> > 80000000
> > ---
> 
> Don't put "---" in a changelog text, otherwise the signed-off-by will be
> cut off.  Can you resend it with that changed to something else like
> "---------------" or anything else?
> 
> thanks,
> 
> greg k-h

sure I'm about to send a v2,

thank you,

fabio