On Wed, Jul 12, 2017 at 11:32:58PM +0100, Mark Rutland wrote: > Today we use TPIDR_EL1 for our percpu offset, and SP_EL0 for current > (and current::thread_info, which is at offset 0). > > Using SP_EL0 in this way prevents us from using EL1 thread mode, where > SP_EL0 is not addressable (since it's used as the active SP). It also > means we can't use SP_EL0 for other purposes (e.g. as a > scratch-register). > > This patch frees up SP_EL0 for such usage, by storing the percpu offset > in current::thread_info, and using TPIDR_EL1 to store current. As we no > longer need to update SP_EL0 at EL0 exception boundaries, this allows us > to delete some code.
Does this mean we can just use asm-generic/percpu.h? Will
