[PATCH 1/4] powerpc/64: Mark prep_irq_for_idle() __cpuidle

Michael Ellerman mpe at ellerman.id.au
Fri Apr 7 00:45:32 AEST 2023

Code in the idle path is not allowed to be instrumented because RCU is
disabled, see commit 0e985e9d2286 ("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 at infradead.org>
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
 arch/powerpc/kernel/irq_64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/irq_64.c b/arch/powerpc/kernel/irq_64.c
index c788c55512ed..2ab0e8d84c1d 100644
--- a/arch/powerpc/kernel/irq_64.c
+++ b/arch/powerpc/kernel/irq_64.c
@@ -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

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