linux-kernel - Re: [RFC 11/13] genapic: reduce stack pressuge in io_apic.c step 3 target

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Message-ID: <48C53E59.9010709@sgi.com>
Date:	Mon, 08 Sep 2008 08:01:45 -0700
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Bert Wesarg <bert.wesarg@...glemail.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	davej@...emonkey.org.uk, David Miller <davem@...emloft.net>,
	Eric Dumazet <dada1@...mosbay.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jack Steiner <steiner@....com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jes Sorensen <jes@....com>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 11/13] genapic: reduce stack pressuge in io_apic.c step
 3	target_cpus

Ingo Molnar wrote:
>>> +#ifdef CONFIG_X86_64
>>> +#define TARGET_CPUS(retval)      (genapic->target_cpus)(&(retval))
>>> +#else
>>> +#define TARGET_CPUS(retval)      retval = (genapic->target_cpus())
>>> +#endif
> 
> hm, this should be unified.
> 
> 	Ingo

As I did that one first, I didn't want to muddle through too much i386 code,
but when I did the vector_allocation_domain, it became more clear that making
them common would be better.

I also tripped myself up because one of my test i386 configs had 64 cpus and
it fired up the "NR_CPUS > BITS_PER_LON" code. ;-)  [And I'm supposing it's
probably justified to believe that there may be "fairly large" 32-bit systems,
for those applications that need horsepower but not a lot of memory.]

Thanks,
Mike
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