linux-kernel - Re: [PATCH 3/8] SFI: core support

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Date:	Tue, 23 Jun 2009 11:03:47 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Feng Tang <feng.tang@...el.com>
Cc:	Len Brown <lenb@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yinghai Lu <yinghai@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"sfi-devel@...plefirmware.org" <sfi-devel@...plefirmware.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Brown, Len" <len.brown@...el.com>
Subject: Re: [PATCH 3/8] SFI: core support


* Feng Tang <feng.tang@...el.com> wrote:

> On Tue, 23 Jun 2009 15:56:43 +0800
> Ingo Molnar <mingo@...e.hu> wrote:
> 
> 
> > >
> > > +#ifdef CONFIG_X86_LOCAL_APIC
> > > +static u64 sfi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
> > > +#endif
> > 
> > if SFI adds a 'depends on X86_LOCAL_APIC' the ugly #ifdef can be
> > dropped.
> 
> When Len designed the SFI spec, he considered the possibility of 
> being used by multiple archs, so we chose not to add a x86 
> dependency, though adding these
> #ifdef does make code ugly :P

But the file i commented on is arch/x86/kernel/sfi.c, not 
drivers/sfi/.

Those #ifdefs arent _that_ bad (and are used elsewhere in x86 code 
too) - but generally some effort should be spent in new code on 
trying to eliminate them.

> > In general, nice stuff - basically SFI is cleanly implemented 
> > ACPI tables without any of the run-code-in-acpi-tables 
> > complications, right?
> 
> Thanks for the comments, I really got inspired :). The expectation 
> for SFI is to be able to run cleanly with CONFIG_ACPI=n, and it 
> works fine on some intel platform.

Ok, cool!

	Ingo
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