linux-kernel - Re: [PATCH 04/22] x86/io_apic: add get_nr_irqs

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Date:	Tue, 5 Oct 2010 11:13:53 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
cc:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	x86@...nel.org, Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH 04/22] x86/io_apic: add get_nr_irqs_gsi()

On Mon, 4 Oct 2010, Konrad Rzeszutek Wilk wrote:

> From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> 
> Impact: new interface to get max GSI
> 
> Add get_nr_irqs_gsi() to return nr_irqs_gsi.  Xen will use this to
> determine how many irqs it needs to reserve for hardware irqs.

Acked.by: Thomas Gleixner <tglx@...utronix.de>

> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Reviewed-by: "H. Peter Anvin" <hpa@...or.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: x86@...nel.org
> Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
> ---
>  arch/x86/include/asm/io_apic.h |    1 +
>  arch/x86/kernel/apic/io_apic.c |    5 +++++
>  2 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
> index 9cb2edb..f27c681 100644
> --- a/arch/x86/include/asm/io_apic.h
> +++ b/arch/x86/include/asm/io_apic.h
> @@ -169,6 +169,7 @@ extern void mask_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries);
>  extern int restore_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries);
>  
>  extern void probe_nr_irqs_gsi(void);
> +extern int get_nr_irqs_gsi(void);
>  
>  extern int setup_ioapic_entry(int apic, int irq,
>  			      struct IO_APIC_route_entry *entry,
> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> index f1efeba..4c9b2b9 100644
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -3862,6 +3862,11 @@ void __init probe_nr_irqs_gsi(void)
>  	printk(KERN_DEBUG "nr_irqs_gsi: %d\n", nr_irqs_gsi);
>  }
>  
> +int get_nr_irqs_gsi(void)
> +{
> +	return nr_irqs_gsi;
> +}
> +
>  #ifdef CONFIG_SPARSE_IRQ
>  int __init arch_probe_nr_irqs(void)
>  {
> -- 
> 1.7.0.4
> 
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