linux-kernel - Re: [PATCH 3/6] x86: ifdef INTR

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Date:	Mon, 14 Feb 2011 12:02:31 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Henrik Kretzschmar <henne@...htwindheim.de>
Cc:	mingo@...dhat.com, tglx@...utronix.de, hpa@...or.com,
	x86@...nel.org, tj@...nel.org, yinghai@...nel.org,
	ak@...ux.intel.com, robert.richter@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] x86: ifdef INTR_REMAP code out


* Henrik Kretzschmar <henne@...htwindheim.de> wrote:

> +#ifdef CONFIG_INTR_REMAP
> +	struct IO_APIC_route_entry **ioapic_entries = NULL;
> +
>  	if (intr_remapping_enabled) {
>  		ioapic_entries = alloc_ioapic_entries();
>  		if (!ioapic_entries) {
> @@ -2133,6 +2136,7 @@ static int lapic_resume(struct sys_device *dev)
>  		mask_IO_APIC_setup(ioapic_entries);
>  		legacy_pic->mask_all();
>  	}
> +#endif
>  
>  	if (x2apic_mode)
>  		enable_x2apic();
> @@ -2173,6 +2177,7 @@ static int lapic_resume(struct sys_device *dev)
>  	apic_write(APIC_ESR, 0);
>  	apic_read(APIC_ESR);
>  
> +#ifdef CONFIG_INTR_REMAP
>  	if (intr_remapping_enabled) {
>  		reenable_intr_remapping(x2apic_mode);
>  		legacy_pic->restore_mask();
> @@ -2180,6 +2185,7 @@ static int lapic_resume(struct sys_device *dev)
>  		free_ioapic_entries(ioapic_entries);
>  	}
>  restore:
> +#endif

Hm, these bits should be factored out in a cleaner fashion - by adding helper 
functions, etc. The x2apic code's integration into the lapic code was done in a 
pretty ugly fashion so it's not your fault - but if we want to reintroduce UP-IOAPIC 
we need to do it cleanly.

Do you still want to do it? :-)

Thanks,

	Ingo
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