Messages in this thread | | | Date | Fri, 11 Oct 2013 08:20:02 +0200 | From | Ingo Molnar <> | Subject | Re: RFD: Does CONFIG_X86_LOCAL_APIC still make sense? |
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* H. Peter Anvin <hpa@zytor.com> wrote:
> I'm trying to wrap my head around if there are use cases where disabling > either CONFIG_X86_UP_APIC or CONFIG_X86_LOCAL_APIC would ever make sense > anymore. > > I am guessing there are probably some small number of embedded systems > which still don't have LAPICs, but is it a significant number and does > anyone care for new kernels? We are not talking about discontinuing > support for non-APIC configurations, just the configuration option.
I guess it depends on the kernel size difference. If it's more than just a few K then a patch will creep back via some CONFIG_EXPERT "reduce kernel bloat" route.
The thing is, if we allow non-apic configurations then we have paid most of the modularization, #ifdef and general maintenance price already. Adding a Kconfig just makes it more testable and breakages more apparent.
Unless I missed some aspects of this that would allow us to simplify code significantly that is.
Thanks,
Ingo
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