linux-kernel - Re: [PATCH] asm-generic: Add msi.h

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Date:	Tue, 18 Nov 2014 11:39:20 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ingo Molnar <mingo@...hat.com>,
	Grant Likely <grant.likely@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Yijing Wang <wangyijing@...wei.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Tony Luck <tony.luck@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
	LAK <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] asm-generic: Add msi.h

On Tuesday 18 November 2014 11:34:37 Thomas Gleixner wrote:
> To support MSI irq domains we want a generic data structure for
> allocation, but we need the option to provide an architecture specific
> version of it. So instead of playing #ifdef games in linux/msi.h we
> add a generic header file and let architectures decide whether to
> include it or to provide their own implementation and provide the
> required typedef.

Acked-by: Arnd Bergmann <arnd@...db.de>

for merging the asm-generic file

> I know that typedefs are not really nice, but in this case there are no
> forward declarations required and it's the simplest solution.

I must be missing the obvious: what problem does the typedef solve
that you would have with just a struct?

	Arnd
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