powerpc/64: Mark prep_irq_for_idle() __cpuidle
Code in the idle path is not allowed to be instrumented because RCU is disabled, see commit 0e985e9d ("cpuidle: Add comments about noinstr/__cpuidle usage"). Mark prep_irq_for_idle() __cpuidle, which is equivalent to noinstr, to enforce that. Suggested-by:Peter Zijlstra <peterz@infradead.org> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20230406144535.3786008-1-mpe@ellerman.id.au
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