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Description of problem:
installed kernel source
cp configs/kernel-2.4.21-athlon.config .config
-> turned on "enable APIC support on single processor" and "IO APIC"
-> got compile error: arch/i386/kernel/kernel.o(.text+0x404b): In
function 'enable_irq': undefined reference to 'send_IPI_self'
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.see steps above
Actual Results: link error
Expected Results: successful compile
There is a reason we don't enable this config option: it is broken on
a LOT of machines and even when it's not, it only provides very very
marginal gain if any at all.
Self compiled kernels aren't supported; in addition we cannot make
every possible combination of kernel options work.
You also forgot to do "make mrproper" as very first step, and
occasionally you need a make oldconfig after make menuconfig.