linux-kernel - Re: [tip:irq/core] irq/x86/io_apic: Fix number of pre-allocated irqs

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Message-ID: <alpine.LFD.2.02.1305291104550.2995@ionos>
Date:	Wed, 29 May 2013 11:08:05 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	mingo@...nel.org, hpa@...or.com, linux-kernel@...r.kernel.org,
	david.a.cohen@...el.com
cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:irq/core] irq/x86/io_apic: Fix number of pre-allocated
 irqs

On Tue, 28 May 2013, tip-bot for David Cohen wrote:

> Commit-ID:  8c956b1b935ec98decb470a6abff8c1f8b28e9f0
> Gitweb:     http://git.kernel.org/tip/8c956b1b935ec98decb470a6abff8c1f8b28e9f0
> Author:     David Cohen <david.a.cohen@...el.com>
> AuthorDate: Tue, 30 Apr 2013 16:20:15 -0700
> Committer:  Ingo Molnar <mingo@...nel.org>
> CommitDate: Tue, 28 May 2013 12:01:29 +0200
> 
> irq/x86/io_apic: Fix number of pre-allocated irqs
> 
> arch_probe_nr_irqs() has a typo when returning number of
> preallocated irqs. Instead of returning the calculated value, it
> returns a constant number NR_IRQ_LEGACY.

That's not a typo. That's on purpose.

We don't want to allocate a gazillion of interrupt descriptors for
nothing. The only ones which must be pre-allocated are the legacy
ones.

> This patch makes sure the calculated value is returned intead.

And therefor defeats the whole purpose of sparse irqs.

I'll zap that commit.
 
> Signed-off-by: David Cohen <david.a.cohen@...el.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: joro@...tes.org
> Link: http://lkml.kernel.org/r/1367364015-12521-1-git-send-email-david.a.cohen@intel.com
> Signed-off-by: Ingo Molnar <mingo@...nel.org>
> ---
>  arch/x86/kernel/apic/io_apic.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> index 9ed796c..7ef2bd9 100644
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -3437,7 +3437,7 @@ int __init arch_probe_nr_irqs(void)
>  	if (nr < nr_irqs)
>  		nr_irqs = nr;
>  
> -	return NR_IRQS_LEGACY;
> +	return nr;
>  }
>  
>  int io_apic_set_pci_routing(struct device *dev, int irq,
> 
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