linux-kernel - Re: [tip:x86/apic] x86: Fix out of order gsi -- add remap_ioapic_gsi_to

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Date:	Sat, 27 Feb 2010 14:57:29 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Ingo Molnar <mingo@...e.hu>, linux-tip-commits@...r.kernel.org,
	linux-kernel@...r.kernel.org, mingo@...hat.com,
	ebiederm@...ssion.com, garyhade@...ibm.com,
	iranna.ankad@...ibm.com, suresh.b.siddha@...el.com,
	tglx@...utronix.de, trenn@...e.de
Subject: Re: [tip:x86/apic] x86: Fix out of order gsi -- add remap_ioapic_gsi_to_irq()

On 02/27/2010 10:52 AM, Yinghai Lu wrote:
> 
> Ingo found:
> | x86: Fix out of order gsi -- add remap_ioapic_gsi_to_irq()
> cause:
>  arch/x86/kernel/apic/io_apic.c:1042: error: implicit declaration of function ?remap_ioapic_gsi_to_irq?
> 
> actually when !CONFIG_ACPI, we have
> #define acpi_ioapic 0
> 
> somehow we still get warning for
> #if (!0) {
> 	...
> } else {
> 	...
> 	remap_ioapic_gsi_to_irq...
> }
> 
> gcc bug?
> 

You're confusing #if and if ( ) { .. }.

Inside an if () { ... } clause the contents still needs to be correct,
even if it will get optimized out.

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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