linux-kernel - rfc: checkpatch logical line continuations (was IBM Akebono: Add support for a new PHY interface to the IBM emac driver)

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Date:	Fri, 07 Mar 2014 13:02:44 -0800
From:	Joe Perches <joe@...ches.com>
To:	David Miller <davem@...emloft.net>
Cc:	alistair@...ple.id.au, netdev@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dan Carpenter <error27@...il.com>,
	Josh Triplett <josh@...htriplett.org>,
	Randy Dunlap <randy.dunlap@...cle.com>
Subject: rfc: checkpatch logical line continuations (was IBM Akebono: Add
 support for a new PHY interface to the IBM emac driver)

(added some cc's)

On Fri, 2014-03-07 at 15:41 -0500, David Miller wrote:
> From: Alistair Popple <alistair@...ple.id.au>
> Date: Thu,  6 Mar 2014 14:52:25 +1100
> 
> > +	out_be32(dev->reg, in_be32(dev->reg) | WKUP_ETH_RGMIIEN
> > +		 | WKUP_ETH_TX_OE | WKUP_ETH_RX_IE);
> 
> When an expression spans multiple lines, the lines should end with
> operators rather than begin with them.

That's not in CodingStyle currently.

Right now, checkpatch emits a --strict only warning on "&&" or "||"
at the beginning of line but that could be changed to any "$Operators"

our $Arithmetic = qr{\+|-|\*|\/|%};
our $Operators	= qr{
			<=|>=|==|!=|
			=>|->|<<|>>|<|>|!|~|
			&&|\|\||,|\^|\+\+|--|&|\||$Arithmetic
		  }x;

The ones that likely have a too high false positive rates
are the negation "!" and bitwise "~".

Also, using perl, it's hard to distinguish between a
logical "&" and the address-of "&" as well as the
multiplication "*" and indirection "*" so maybe those
should be excluded too.

And I think it should only be added as a --strict test.



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