linux-kernel - Re: [PATCH v3 5/5] tty/serial: Add Spreadtrum sc9836-uart driver support

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Date:	Wed, 3 Dec 2014 10:11:09 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Lyra Zhang <zhang.lyra@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	"gnomes@...rguk.ukuu.org.uk" <gnomes@...rguk.ukuu.org.uk>,
	Heiko Stübner <heiko@...ech.de>,
	Mark Brown <broonie@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"andrew@...n.ch" <andrew@...n.ch>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
	"jslaby@...e.cz" <jslaby@...e.cz>,
	Ramkumar Ramachandra <artagnon@...il.com>,
	"lanqing.liu@...eadtrum.com" <lanqing.liu@...eadtrum.com>,
	Wei Qiao (乔伟) <wei.qiao@...eadtrum.com>,
	Jonathan Corbet <corbet@....net>,
	Chunyan Zhang <chunyan.zhang@...eadtrum.com>,
	"zhizhou.zhang" <zhizhou.zhang@...eadtrum.com>,
	"geng.ren@...eadtrum.com" <geng.ren@...eadtrum.com>,
	Murali Karicheri <m-karicheri2@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Orson Zhai <orsonzhai@...il.com>,
	"florian.vaussard@...l.ch" <florian.vaussard@...l.ch>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"jason@...edaemon.net" <jason@...edaemon.net>,
	Pawel Moll <pawel.moll@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Hayato Suzuki <hytszk@...il.com>,
	"rrichter@...ium.com" <rrichter@...ium.com>,
	Mark Brown <broonie@...nel.org>,
	"sprdlinux@...elists.org" <sprdlinux@...elists.org>,
	"shawn.guo@...escale.com" <shawn.guo@...escale.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH v3 5/5] tty/serial: Add Spreadtrum sc9836-uart driver
 support

On Wed, Dec 03, 2014 at 10:50:17AM +0100, Arnd Bergmann wrote:
> On Wednesday 03 December 2014 17:17:13 Lyra Zhang wrote:
> 
> > 2014-11-27 2:29 GMT+08:00 Murali Karicheri <m-karicheri2@...com>:
> > > How about sorting this includes? asm/irq.h go first followed linux/ in alphabatical order?
> >
> > There are a few compile warnings if I moved asm/irq.h to the top of
> > all included files.
> 
> The order that Murali meant is
> 
> - first all linux/*.h headers, sorted alphabetically
> - then all asm/*.h headers, again sorted alphabetically
> 
> This is the recommended style in general.
> 
> > Warning details are below:
> > 
> > In file included from drivers/tty/serial/sprd_serial.c:14:0:
> > ./arch/arm64/include/asm/irq.h:6:39: warning: ‘struct pt_regs’
> > declared inside parameter list [enabled by default]
> >  extern void (*handle_arch_irq)(struct pt_regs *);
> >                                        ^
> > ./arch/arm64/include/asm/irq.h:6:39: warning: its scope is only this
> > definition or declaration, which is probably not what you want
> > [enabled by default]
> > ./arch/arm64/include/asm/irq.h:8:54: warning: ‘struct pt_regs’
> > declared inside parameter list [enabled by default]
> >  extern void set_handle_irq(void (*handle_irq)(struct pt_regs *));
> > 
> 
> I would consider this a (minor) bug in asm/irq.h. If you don't mind,
> please submit a patch to add a line with 'struct pt_regs;' to
> asm/irq.h.

A better question is: why is a modern driver using asm/irq.h in the
first place.

We used to include that file when platforms defined IRQ numbers
statically, but modern platforms don't do that, so it shouldn't be
required anymore.

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