[PATCH v2 3/6] MIPS: smp.c: Introduce mechanism for freeing and allocating IPIs

For the MIPS remote processor implementation, we need additional IPIs to talk to the remote processor. Since MIPS GIC reserves exactly the right number of IPI IRQs required by Linux for the number of VPs in the system, this is not possible without releasing some recources. This commit introduces

[PATCH v2 3/6] MIPS: smp.c: Introduce mechanism for freeing and allocating IPIs

For the MIPS remote processor implementation, we need additional IPIs to talk to the remote processor. Since MIPS GIC reserves exactly the right number of IPI IRQs required by Linux for the number of VPs in the system, this is not possible without releasing some recources. This commit introduces