linux-kernel - Re: [PATCH V2 08/19] irqchip: crossbar: fix checkpatch warning

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Message-ID: <20140612153226.GE8664@titan.lakedaemon.net>
Date:	Thu, 12 Jun 2014 11:32:26 -0400
From:	Jason Cooper <jason@...edaemon.net>
To:	Joe Perches <joe@...ches.com>
Cc:	Sricharan R <r.sricharan@...com>, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, tony@...mide.com,
	santosh.shilimkar@...com, nm@...com, rnayak@...com,
	linux@....linux.org.uk, tglx@...utronix.de
Subject: Re: [PATCH V2 08/19] irqchip: crossbar: fix checkpatch warning

Hey Joe,

On Thu, Jun 12, 2014 at 07:18:31AM -0700, Joe Perches wrote:
> On Thu, 2014-06-12 at 19:05 +0530, Sricharan R wrote:
> > On Thursday 12 June 2014 06:40 PM, Jason Cooper wrote:
> > > On Thu, Jun 12, 2014 at 05:23:16PM +0530, Sricharan R wrote:
> > >> diff --git a/drivers/irqchip/irq-crossbar.c b/drivers/irqchip/irq-crossbar.c
> []
> > >> @@ -34,7 +34,8 @@ struct crossbar_device {
> > >>  	uint *irq_map;
> > >>  	void __iomem *crossbar_base;
> > >>  	int *register_offsets;
> > >> -	void (*write) (int, int);
> > >> +
> > >> +	void (*write)(int, int);
> > > 
> > > The empty line here looks bogus to me.
> 
> Good eye.  It's unnecessary.
> 
> > > Did you re-run checkpatch after fixing the unnecessary space to
> > > see if it still complained about having a 'blank line after
> > > declarations'?
> > > 
> >  Yes, it still complains even after fixing unnecessary space.
> 
> It's a checkpatch defect.
> 
> It's been fixed by:
> https://lkml.org/lkml/2014/6/6/426

Ah, good to know.

> > > I'm generally opposed to these sorts of checkpatch patches, especially
> > > when they are just warnings.  It's great for a new driver in the staging
> > > tree, but it makes backporting future bugfixes that much harder when
> > > drivers have been live in mainline.
> 
> Blind adherence to checkpatch isn't always a great idea.

Agreed.

> But bugfix backports haven't been much of an issue in
> other subsystems with fairly active whitespace/style
> changes.

Most of the mvebu fixes we've had that failed to apply were generally
due to a large whitespace change (dts node shuffling, admittedly not
checkpatch-related).  I've also frequently been stymied by code cleanups
when using git blame to find the commit introducing a regression.

So, my general rule is: If you're submitting a patch to make checkpatch
be quiet, re-assess the need.  If you're making changes and you can fix
some checkpatch items while you're there, then do so.

There are certainly legitimate checkpatch-only patches, I just don't
think this is one qualifies.

thx,

Jason.
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