linux-kernel - Re: [PATCH 2/2] drm/panel: Add driver for sitronix ST7789V panel

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Message-ID: <20170207155334.fq4emlhpj4hkhets@lukather>
Date:   Tue, 7 Feb 2017 16:53:34 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] drm/panel: Add driver for sitronix ST7789V panel

On Mon, Feb 06, 2017 at 02:26:20PM +0100, Thierry Reding wrote:
> > +#define NUMARGS(...)  (sizeof((int[]){__VA_ARGS__}) / sizeof(int))
> > +#define st7789v_send(ctx, cmd, ...)					\
> > +	st7789v_write_command_data(ctx, cmd, NUMARGS(__VA_ARGS__),	\
> > +				   ##__VA_ARGS__)
> 
> How is this going to work if any of the arguments happens to not be an
> int? What if you have something like this:
> 
> 	u8 value = 0x2;
> 
> 	st7789v_write_command_data(ctx, cmd, 0x1, value, 0x3);
> 
> ? Wouldn't that invalidly read "value" as int and wrongly increment the
> ap by three bytes too many?


Hmmm, it might be. I'll remove it, and take all your other changes
into account.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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