Re: [PATCH] x86: make generic arch support NUMAQ v2

["Yinghai Lu" <yhlu.kernel@gmail.com>]

On Fri, Jun 6, 2008 at 7:09 AM, Ingo Molnar <mingo@elte.hu> wrote:
>
> * Yinghai Lu <yhlu.kernel@gmail.com> wrote:
>
>> > It is my understanding that special support for NUMAQ should die, so
>> > the only remaning usage of CONFIG_NUMAQ is if set to select
>> > GENERICARCH. In other words that you should not use CONFIG_NUMAQ
>> > anywhere in the code but solely rely on GENERICARCH and then do
>> > runtime detection of the other things.
>>
>> in case someone don't want to build that special numaq code in.
>>
>> I think we should make ES7000, Summit depend to GENERICARCH too.
>
> correct. If someone wants more restricted support, pure CONFIG_X86_PC
> should do that fine.
>
> also, even GENERICARCH should have as little Kconfig implications as
> possible. I.e. before your cleanups the subarch code was used to
> implement something very non-PC, and it was done build-time - which is a
> PITA in terms of testing and in terms of general complexity. We want to
> remove those complications and eventually we want to remove the subarch
> code altogether. (without narrowing hw support of course)

current

static struct genapic *apic_probe[] __initdata = {
#ifdef CONFIG_X86_NUMAQ
        &apic_numaq,
#endif
        &apic_summit,
        &apic_bigsmp,
        &apic_es7000,
        &apic_default,  /* must be last */
        NULL,
};

the apic_default is the 86_PC.

so could make GENERICARCH default to yes.

and have

static struct genapic *apic_probe[] __initdata = {
#ifdef CONFIG_X86_NUMAQ
        &apic_numaq,
#endif
#ifdef CONFIG_X86_SUMMIT
        &apic_summit,
#endif
#ifdef CONFIG_X86_BIGSMP
        &apic_bigsmp,
#endif
#ifdef CONFIG_X86_ES7000
        &apic_es7000,
Eendif
        &apic_default,  /* must be last */
        NULL,
};


also may expand probe a little bit...to cover other different.

YH