linux-kernel - RE: [patch 24/26] genirq: Provide handle_percpu_simple

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Date:	Tue, 25 Feb 2014 12:25:00 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>
CC:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: RE: [patch 24/26] genirq: Provide handle_percpu_simple_irq()



> -----Original Message-----
> From: Thomas Gleixner [mailto:tglx@...utronix.de]
> Sent: Sunday, February 23, 2014 1:40 PM
> To: LKML
> Cc: Ingo Molnar; Peter Zijlstra; KY Srinivasan; Greg Kroah-Hartman
> Subject: [patch 24/26] genirq: Provide handle_percpu_simple_irq()
> 
> Special case for vmbus to replace their homegrown flow handler.
> 
> Not sure whether we need it at all. I can't see a reason why that needs
> special handling at all if CONFIG_HYPERV=n

Thomas,

Thank you for cleaning up this code. All of the VMBUS code is active only if CONFIG_HYPERV is set.

Regards,

K. Y

> 
> Not-Yet-Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: "K. Y. Srinivasan" <kys@...rosoft.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  include/linux/irq.h |    1 +
>  kernel/irq/chip.c   |   15 +++++++++++++++
>  2 files changed, 16 insertions(+)
> 
> Index: tip/include/linux/irq.h
> ==========================================================
> =========
> --- tip.orig/include/linux/irq.h
> +++ tip/include/linux/irq.h
> @@ -423,6 +423,7 @@ extern void handle_edge_irq(unsigned int  extern
> void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc);  extern
> void handle_simple_irq(unsigned int irq, struct irq_desc *desc);  extern void
> handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
> +extern void handle_percpu_simple_irq(unsigned int irq, struct irq_desc
> +*desc);
>  extern void handle_percpu_devid_irq(unsigned int irq, struct irq_desc
> *desc);  extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
> extern void handle_nested_irq(unsigned int irq);
> Index: tip/kernel/irq/chip.c
> ==========================================================
> =========
> --- tip.orig/kernel/irq/chip.c
> +++ tip/kernel/irq/chip.c
> @@ -623,6 +623,21 @@ handle_percpu_irq(unsigned int irq, stru  }
> 
>  /**
> + *	handle_percpu_simple_irq - Per CPU local irq handler
> + *	@irq:	the interrupt number
> + *	@desc:	the interrupt description structure for this irq
> + *
> + *	Per CPU interrupts on SMP machines without locking
> + *	requirements. No ack/eoi handling.
> + */
> +void
> +handle_percpu_simple_irq(unsigned int irq, struct irq_desc *desc) {
> +	kstat_incr_irqs_this_cpu(irq, desc);
> +	handle_irq_event_percpu(desc, desc->action); }
> +
> +/**
>   * handle_percpu_devid_irq - Per CPU local irq handler with per cpu dev ids
>   * @irq:	the interrupt number
>   * @desc:	the interrupt description structure for this irq
> 

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