linux-kernel - Re: [PATCH 03/15] irq: mips: simplify do_domain

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Date:   Thu, 28 Oct 2021 18:11:55 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Guenter Roeck <linux@...ck-us.net>
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,
        maz@...nel.org, 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 03/15] irq: mips: simplify do_domain_IRQ()

On Thu, Oct 28, 2021 at 10:07:32AM -0700, Guenter Roeck wrote:
> On Thu, Oct 21, 2021 at 07:02:24PM +0100, Mark Rutland wrote:
> > There's no need fpr arch/mips's do_domain_IRQ() 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.
> > 
> > There should be no functional change as a result of this patch.
> > 
> 
> Except for this compile error:
> 
> arch/mips/kernel/irq.c: In function 'do_domain_IRQ':
> arch/mips/kernel/irq.c:114:26: error: unused variable 'desc' [-Werror=unused-variable]
>   114 |         struct irq_desc *desc;
> 
> Guenter

Sorry for that; this has been fixed by:

  https://lore.kernel.org/r/20211028095652.3503790-1-siyanteng@loongson.cn

... which is queued up:

  https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/commit/?h=irq/remove-handle-domain-irq-20211026&id=34fca8947b2743e6a3a9a8a3a44962e625993533


Thanks,
Mark.

> 
> > Signed-off-by: Mark Rutland <mark.rutland@....com>
> > Cc: Marc Zyngier <maz@...nel.org>
> > Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > ---
> >  arch/mips/kernel/irq.c | 6 +-----
> >  1 file changed, 1 insertion(+), 5 deletions(-)
> > 
> > diff --git a/arch/mips/kernel/irq.c b/arch/mips/kernel/irq.c
> > index d20e002b3246..1fee96ef8059 100644
> > --- a/arch/mips/kernel/irq.c
> > +++ b/arch/mips/kernel/irq.c
> > @@ -115,11 +115,7 @@ void __irq_entry do_domain_IRQ(struct irq_domain *domain, unsigned int hwirq)
> >  
> >  	irq_enter();
> >  	check_stack_overflow();
> > -
> > -	desc = irq_resolve_mapping(domain, hwirq);
> > -	if (likely(desc))
> > -		handle_irq_desc(desc);
> > -
> > +	generic_handle_domain_irq(domain, hwirq);
> >  	irq_exit();
> >  }
> >  #endif
> > -- 
> > 2.11.0
> >