linux-kernel - Re: [PATCH v3 02/14] serial: liteuart: use bit number macros

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Message-ID: <Y3O1jyO+9iCGS5Rx@errol.ini.cmu.edu>
Date:   Tue, 15 Nov 2022 10:51:43 -0500
From:   "Gabriel L. Somlo" <gsomlo@...il.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-serial <linux-serial@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, kgugala@...micro.com,
        mholenko@...micro.com, joel@....id.au,
        david.abdurachmanov@...il.com, florent@...oy-digital.fr,
        geert@...ux-m68k.org
Subject: Re: [PATCH v3 02/14] serial: liteuart: use bit number macros

On Tue, Nov 15, 2022 at 05:33:47PM +0200, Ilpo Järvinen wrote:
> On Sat, 12 Nov 2022, Gabriel Somlo wrote:
> 
> > Replace magic bit constants (e.g., 1, 2, 4) with BIT(x) expressions.
> > 
> > Signed-off-by: Gabriel Somlo <gsomlo@...il.com>
> > ---
> >  drivers/tty/serial/liteuart.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/tty/serial/liteuart.c b/drivers/tty/serial/liteuart.c
> > index 32b81bd03d0c..1497d4cdc221 100644
> > --- a/drivers/tty/serial/liteuart.c
> > +++ b/drivers/tty/serial/liteuart.c
> > @@ -38,8 +38,8 @@
> >  #define OFF_EV_ENABLE	0x14
> >  
> >  /* events */
> > -#define EV_TX		0x1
> > -#define EV_RX		0x2
> > +#define EV_TX		BIT(0)
> > +#define EV_RX		BIT(1)
> >  
> >  struct liteuart_port {
> >  	struct uart_port port;
> > 
> 
> This seems to assume some random header provides BIT() for you?

OK: version 4 of the series will have this commit explicitly
#include <linux/bits.h>, which right now is most likely brought
in implicitly by one or more of the existing headers.

Thanks,
--Gabriel