linux-kernel - Re: [PATCH] irqchip/jcore-aic: Fix missing allocation of IRQ descriptors

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Message-ID: <7e58646d7ae4cad32ae30e2e7b54806cc1272d63.camel@physik.fu-berlin.de>
Date:   Thu, 11 May 2023 11:03:01 +0200
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Rich Felker <dalias@...c.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] irqchip/jcore-aic: Fix missing allocation of IRQ
 descriptors

On Thu, 2023-05-11 at 09:47 +0100, Marc Zyngier wrote:
> On Thu, 11 May 2023 08:22:20 +0100,
> John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de> wrote:
> > 
> > Hi Jason!
> 
> ???

Sorry, I was confused by this:

> > > [- Jason]
> > > 
> > > It really begs the question: how has it ever been working before?
> > 
> > Users already used a locally patched kernel to work around this problem.
> 
> You're not answering my question. Does it mean JCore never worked
> upstream?

It did still work which is why the previously suggested change was to make a
failing call to irq_alloc_descs() non-fatal. The boards still booted up.

> > > Is there any plan to modernise the port and get it to allocate
> > > irq_descs on demand, as we do on most architectures?
> > 
> > Yes, there are plans to modernize the port. We're first working on
> > upstreaming all kinds of patches that have been queuing up over the
> > time.
> 
> I'd rather you skip that step and focus on making it work as a modern
> architecture. This really looks like ARM circa 2007... :-/

We have a patch-set for switching it to device tree in the pipeline.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
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