linux-kernel - Re: [1/1] net: pegasus: remove dead coding

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Date:	Wed, 18 May 2016 10:50:45 +0300
From:	Petko Manolov <petkan@...-labs.com>
To:	Oliver Neukum <oneukum@...e.com>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	Heinrich Schuchardt <xypron.glpk@....de>,
	Petko Manolov <petkan@...leusys.com>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [1/1] net: pegasus: remove dead coding

On 16-05-18 09:15:40, Oliver Neukum wrote:
> On Tue, 2016-05-17 at 23:30 -0700, Guenter Roeck wrote:
> > On Wed, May 18, 2016 at 02:13:30AM +0200, Heinrich Schuchardt wrote:
> > > (!count || count < 4) is always true.
> > 
> > Even if count >= 4 ?
> 
> The check for !count is redundant, though. Gcc, however,
> will surely simplify the expression.

Yep, gcc-6 generates this code:

	...
	cmp	$0x3,%edx
	jle	b9 <read_bulk_callback+0x69>
	...

Which does not invalidate your statement that "!count" is redundant. :)


		Petko