linux-kernel - Re: [PATCH net-next 6/9] net: phy: add backplane kr driver support

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Date:   Fri, 27 Mar 2020 11:25:26 -0700
From:   Joe Perches <joe@...ches.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Florinel Iordache <florinel.iordache@....com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, f.fainelli@...il.com,
        hkallweit1@...il.com, linux@...linux.org.uk,
        devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
        robh+dt@...nel.org, mark.rutland@....com, kuba@...nel.org,
        corbet@....net, shawnguo@...nel.org, leoyang.li@....com,
        madalin.bucur@....nxp.com, ioana.ciornei@....com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 6/9] net: phy: add backplane kr driver support

On Fri, 2020-03-27 at 15:22 +0100, Andrew Lunn wrote:
> > +/* Backplane custom logging */
> > +#define BPDEV_LOG(name) \
> > +	char log_buffer[LOG_BUFFER_SIZE]; \
> > +	va_list args; va_start(args, msg); \
> > +	vsnprintf(log_buffer, LOG_BUFFER_SIZE - 1, msg, args); \
> > +	if (!bpphy->attached_dev) \
> > +		dev_##name(&bpphy->mdio.dev, log_buffer); \
> > +	else \
> > +		dev_##name(&bpphy->mdio.dev, "%s: %s", \
> > +			netdev_name(bpphy->attached_dev), log_buffer); \
> > +	va_end(args)

This could also use %pV instead of an intermediate buffer.

It's also bad form to use macros with required
external variables.