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powerpc/64: Mark prep_irq_for_idle() __cpuidle

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Code in the idle path is not allowed to be instrumented because RCU is
disabled, see commit 0e985e9d22 ("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
This commit is contained in:
Michael Ellerman 2023-04-07 00:45:32 +10:00
parent e5b6634aa1
commit 7640854d96
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kernel/irq_64.c
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@ -354,7 +354,7 @@ EXPORT_SYMBOL(arch_local_irq_restore);
* disabled and marked as such, so the local_irq_enable() call
* in arch_cpu_idle() will properly re-enable everything.
*/
bool prep_irq_for_idle(void)
__cpuidle bool prep_irq_for_idle(void)
{
/*
* First we need to hard disable to ensure no interrupt