linux-kernel - Re: [PATCH 01/10] irqchip: irq-mips-gic: export gic_send

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Date:	Mon, 24 Aug 2015 16:55:33 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Qais Yousef <qais.yousef@...tec.com>
cc:	alsa-devel@...a-project.org, Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org
Subject: Re: [PATCH 01/10] irqchip: irq-mips-gic: export gic_send_ipi

On Mon, 24 Aug 2015, Qais Yousef wrote:
> On 08/24/2015 01:49 PM, Thomas Gleixner wrote:
> > On Mon, 24 Aug 2015, Qais Yousef wrote:
> > 
> > > Some drivers might require to send ipi to other cores. So export it.
> > Which IPIs do you need to send from a driver which are not exposed by
> > the SMP functions already?
> 
> It's not an SMP IPI. We use GIC to exchange interrupts between AXD and the
> host system since AXD is another MIPS core in the cluster.

So that should have been in the changelog to begin with.
 
> > > This will be used later by AXD driver.
> > That smells fishy and it wants a proper explanation WHY and not just a
> > sloppy statement that it will be used later. I can figure that out
> > myself as exporting a function without using it does not make any sense.
> 
> Sorry for the terse explanation. As pointed above AXD uses GIC to send and
> receive interrupts to the host core. Without this change I can't compile the
> driver as a driver module because the symbol is not exported.

Really? Exporting it solves that problem then. That's interesting news
for me.

Thanks,

	tglx
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