linux-kernel - Re: linux-next: manual merge of the rcu tree with the irqchip tree

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Date:   Fri, 13 Aug 2021 06:52:53 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Marc Zyngier <maz@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Valentin Schneider <valentin.schneider@....com>
Subject: Re: linux-next: manual merge of the rcu tree with the irqchip tree

On Fri, Aug 13, 2021 at 02:04:37PM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> Today's linux-next merge of the rcu tree got a conflict in:
> 
>   kernel/irq/chip.c
> 
> between commit:
> 
>   56707bb845f5 ("genirq, irq-gic-v3: Make NMI flow handlers use ->irq_ack() if available")
> 
> from the irqchip tree and commit:
> 
>   ef62bf7e92d8 ("irq: abstract irqaction handler invocation")
> 
> from the rcu tree.
> 
> I fixed it up (see below) and can carry the fix as necessary. This
> is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging.  You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.

I had pulled these two in just for testing only because I was chasing
a problem that looked like long-running irq handlers, but which proved
to be something rather different.

ef62bf7e92d8 ("irq: abstract irqaction handler invocation")
2eeaae3c02b9 ("irq: detect long-running IRQ handlers")

I will be dropping these this morning, Pacific Time.

							Thanx, Paul

> -- 
> Cheers,
> Stephen Rothwell
> 
> diff --cc kernel/irq/chip.c
> index 1b1171113437,804c2791315d..000000000000
> --- a/kernel/irq/chip.c
> +++ b/kernel/irq/chip.c
> @@@ -768,11 -744,6 +768,9 @@@ void handle_nmi(struct irq_desc *desc
>   
>   	__kstat_incr_irqs_this_cpu(desc);
>   
>  +	if (chip->irq_ack)
>  +		chip->irq_ack(&desc->irq_data);
>  +
> - 	trace_irq_handler_entry(irq, action);
>   	/*
>   	 * NMIs cannot be shared, there is only one action.
>   	 */
> @@@ -1050,13 -954,7 +1044,10 @@@ void handle_percpu_devid_nmi(struct irq
>   
>   	__kstat_incr_irqs_this_cpu(desc);
>   
>  +	if (chip->irq_ack)
>  +		chip->irq_ack(&desc->irq_data);
>  +
> - 	trace_irq_handler_entry(irq, action);
> - 	res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
> - 	trace_irq_handler_exit(irq, action, res);
> + 	handle_irqaction_percpu_devid(irq, action);
>   
>   	if (chip->irq_eoi)
>   		chip->irq_eoi(&desc->irq_data);