linux-kernel - Re: [PATCH 04/15] irq: simplify handle_domain

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Message-ID: <20211022150555.GB86184@C02TD0UTHF1T.local>
Date:   Fri, 22 Oct 2021 16:05:55 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-kernel@...r.kernel.org, aou@...s.berkeley.edu,
        catalin.marinas@....com, deanbo422@...il.com, green.hu@...il.com,
        guoren@...nel.org, jonas@...thpole.se, kernelfans@...il.com,
        linux-arm-kernel@...ts.infradead.org, linux@...linux.org.uk,
        nickhu@...estech.com, palmer@...belt.com, paulmck@...nel.org,
        paul.walmsley@...ive.com, peterz@...radead.org, shorne@...il.com,
        stefan.kristiansson@...nalahti.fi, tglx@...utronix.de,
        torvalds@...ux-foundation.org, tsbogend@...ha.franken.de,
        vgupta@...nel.org, will@...nel.org
Subject: Re: [PATCH 04/15] irq: simplify handle_domain_{irq,nmi}()

On Fri, Oct 22, 2021 at 11:52:28AM +0100, Marc Zyngier wrote:
> On Thu, 21 Oct 2021 19:02:25 +0100,
> Mark Rutland <mark.rutland@....com> wrote:
> > 
> > There's no need for handle_domain_{irq,nmi}() to open-code the NULL
> > check performed by handle_irq_desc(), nor the resolution of the desc
> > performed by generic_handle_domain_irq().
> > 
> > Use generic_handle_domain_irq() directly, as this is functioanlly
> > equivalent and clearer. At the same time, delete the stale comments,
> > which are no longer helpful.
> > 
> > There should be no functional change as a result of this patch.
> > 
> > Signed-off-by: Mark Rutland <mark.rutland@....com>
> > Cc: Marc Zyngier <maz@...nel.org>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > ---
> >  kernel/irq/irqdesc.c | 24 ++++--------------------
> >  1 file changed, 4 insertions(+), 20 deletions(-)

> Yup, that's really neat. I somehow missed that when I moved some of
> the legacy stuff to be ARM specific.
> 
> On a vaguely related note, I think you can drop the EXPORT_SYMBOL_GPL
> on handle_irq_desc() now.

Seems so:

[mark@...rids:~/src/linux]% git grep -w handle_irq_desc   
arch/arm/kernel/irq.c:          handle_irq_desc(desc);
include/linux/irqdesc.h:int handle_irq_desc(struct irq_desc *desc);
kernel/irq/irqdesc.c:int handle_irq_desc(struct irq_desc *desc)
kernel/irq/irqdesc.c:   return handle_irq_desc(irq_to_desc(irq));
kernel/irq/irqdesc.c:   return handle_irq_desc(irq_resolve_mapping(domain, hwirq));

I'll add a patch to clean that up.

Thanks,
Mark