linux-kernel - Re: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig

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Date:	Mon, 07 Aug 2006 12:16:14 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Randy.Dunlap" <rdunlap@...otime.net>
Cc:	Andrew Morton <akpm@...l.org>, Andi Kleen <ak@...e.de>,
	"Protasevich, Natalie" <Natalie.Protasevich@...SYS.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig

"Randy.Dunlap" <rdunlap@...otime.net> writes:

>> 
>> This of course applies to the -mm tree because the rest
>> of the irq work is not yet in the mainline kernel.
>> 
>>  arch/x86_64/Kconfig      |   14 ++++++++++++++
>>  include/asm-x86_64/irq.h |    3 ++-
>>  2 files changed, 16 insertions(+), 1 deletions(-)
>> 
>> diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
>> index 7598d99..cea78d7 100644
>> --- a/arch/x86_64/Kconfig
>> +++ b/arch/x86_64/Kconfig
>> @@ -384,6 +384,20 @@ config NR_CPUS
>>  	  This is purely to save memory - each supported CPU requires
>>  	  memory in the static kernel configuration.
>
> Thanks for the language fixes.
> I'm confused about one thing.  What is NR_IRQS for non-SMP?
> Does it default to 4096 or something else?

Right the default is still 4096 which is fairly silly.

> Does this build on non-SMP?  Is CONFIG_NR_IRQS defined for non-SMP?

Ugh.  I have a "depends on SMP" line in there.  That shouldn't be.
Ok.  I need to fix the non SMP case, at least take out the dependency
and if I'm clever move the default down to 224.

Eric
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