linux-kernel - Re: About irq_create_affinity_masks() for a platform device driver

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Message-ID: <87o8uveoye.fsf@nanos.tec.linutronix.de>
Date:   Wed, 22 Jan 2020 11:59:53 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     John Garry <john.garry@...wei.com>
Cc:     Marc Zyngier <maz@...nel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        chenxiang <chenxiang66@...ilicon.com>
Subject: Re: About irq_create_affinity_masks() for a platform device driver

John,

John Garry <john.garry@...wei.com> writes:
> Would there be any issue with a SCSI platform device driver referencing 
> this function?
>
> So I have a multi-queue platform device, and I want to spread interrupts 
> over all possible CPUs, just like we can do for PCI MSI vectors. This 
> topic was touched on in [0].
>
> And, if so it's ok, could we export that same symbol?

I think you will need something similar to what we have in the pci/msi
code, but that shouldn't be in your device driver. So I'd rather create
platform infrastructure for this and export that.

Thanks,

        tglx