The Kconfig help documentation in sys-kernel/gentoo-sources-2.6.28-r5 for CONFIG_SMP refernces file:Documentation/i386/IO-APIC.tx. The IO-APIC.txt file is actually in file:Documentation/x86/i386/IO-APIC.txt. I am sure this is just a small error in upstream. Reproducible: Always Steps to Reproduce: 1. emerge =sys-kernel/gentoo-sources-2.6.28-r5 2. Read help system on SMP Expected Results: The help system should reference the correct documentation.
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=arch/x86/Kconfig;h=a6efe0a2e9ae613a81bedec5e4772698d16541cc;hb=HEAD line 247 It is upstreams error.
I see this is fixed in at least gentoo-sources-2.6.29-r5. "See also <file:Documentation/i386/IO-APIC.txt>, " As we are planning on going stable with this and it is a bit of a minor typo, I am going to close this.