linux-kernel - Re: [PATCH 9/9] x86/apic: support moorestown interrupt subsystem

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Date:	Mon, 29 Jun 2009 10:59:33 +0800
From:	Feng Tang <feng.tang@...el.com>
To:	"Pan, Jacob jun" <jacob.jun.pan@...el.com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	"Brown, Len" <len.brown@...el.com>
Subject: Re: [PATCH 9/9] x86/apic: support moorestown interrupt subsystem

On Sat, 27 Jun 2009 01:18:50 +0800
"Pan, Jacob jun" <jacob.jun.pan@...el.com> wrote:

> >> -#ifdef CONFIG_ACPI
> >> +#if defined(CONFIG_ACPI) || defined(CONFIG_SFI)
> >
> >Please add a new helper non-interactive Kconfig symbol instead of
> >increasing the #ifdef jungle.
> >
> [[JPAN]] I agreed, maybe this should be part of the SFI patch or
> already have similar plans?

Yes, Ingo has given similar comments for SFI code. I thought about 2
methods for this:
1. these "#ifdef...#endif" covers three functions:
 extern int io_apic_get_unique_id(int ioapic, int apic_id);
 extern int io_apic_get_version(int ioapic);
 extern int io_apic_get_redir_entries(int ioapic);	
how about just completely removing the "#ifdef...#endif", as ACPI/SFI 
codes are heavily used on x86 platforms, and it may bring one hundred
additional bytes for None-ACPI/SFI platforms 
2. create a new "CONFIG_ACPI_SFI" option, using this new option to cover
this case, and let "ACPI"/"SFI" option select it in Kconfig files

any comments? thanks

- Feng
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