linux-kernel - Re: [PATCH v8 06/22] mfd: omap-usb-tll: introduce and use mode_needs

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Message-ID: <20130118150242.GF23505@n2100.arm.linux.org.uk>
Date:	Fri, 18 Jan 2013 15:02:42 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Roger Quadros <rogerq@...com>
Cc:	sameo@...ux.intel.com, balbi@...com, tony@...mide.com,
	kishon@...com, sshtylyov@...sta.com, bjorn@...k.no,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v8 06/22] mfd: omap-usb-tll: introduce and use
	mode_needs_tll()

On Fri, Jan 18, 2013 at 02:17:09PM +0200, Roger Quadros wrote:
> +/* only PHY and UNUSED modes don't need TLL */
> +#define omap_usb_mode_needs_tll(x)	((x != OMAP_USBHS_PORT_MODE_UNUSED) &&\
> +					 (x != OMAP_EHCI_PORT_MODE_PHY))

Growl.

These parens do not make anything safer at all - they just obfuscate.  The
safe version of the above macro would have been:

#define omap_usb_mode_needs_tll(x)	((x) != OMAP_USBHS_PORT_MODE_UNUSED &&\
					 (x) != OMAP_EHCI_PORT_MODE_PHY)

If you're going to use a macro argument in an expression, it needs parens.
Simple expressions like a != b && c != d do _not_ need parens.

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