powerpc: smp: remove hack to obtain offset of task_struct::cpu
Instead of relying on awful hacks to obtain the offset of the cpu field in struct task_struct, move it back into struct thread_info, which does not create the same level of circular dependency hell when trying to include the header file that defines it. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au>
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