linux-kernel - Re: [PATCH v2] ARM: plat-versatile: move FPGA irq driver to drivers/irqchip

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Date:	Fri, 2 Nov 2012 12:15:56 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, arm@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Rob Herring <robherring2@...il.com>
Subject: Re: [PATCH v2] ARM: plat-versatile: move FPGA irq driver to
	drivers/irqchip

On Thu, Nov 01, 2012 at 11:20:10PM +0100, Thomas Petazzoni wrote:
> Linus,
> 
> On Thu,  1 Nov 2012 22:28:49 +0100, Linus Walleij wrote:
> 
> > +void fpga_handle_irq(struct pt_regs *regs);
> 
> This function does not need to be exposed in a public header: as
> proposed for the bcm2835 and armada-370-xp IRQ controller drivers, the
> driver should directly do handle_arch_irq = fpga_handle_irq, and
> therefore there is no need for the machine desc structure to reference
> fpga_handle_irq anymore.

Err no, then you don't understand what's going on here.  This may or may
not be a top-level IRQ handler.  Some ARM platforms have three of these
cascaded, others have one of these cascaded off a VIC or GIC.

To override the top level IRQ handler unconditionally is going to break
platforms.
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