ACPI: processor_idle: Use acpi_idle_play_dead() for all C-states

Notice that acpi_processor_setup_cstates() can set state->enter_dead to acpi_idle_play_dead() for all C-states unconditionally and remove the
confusing C-state type check done before setting it.

No intentional functional impact.

Suggested-by: Peter Zijlstra <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Reviewed-by: Mario Limonciello <[email protected]>
Tested-by: Mario Limonciello <[email protected]> # 6.12-rc7
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: rafaeljw

drivers/acpi/processor_idle.c

@@ -803,12 +803,12 @@ static int acpi_processor_setup_cstates(struct acpi_processor *pr)
 		state->enter = acpi_idle_enter;
 
 		state->flags = 0;
-		if (cx->type == ACPI_STATE_C1 || cx->type == ACPI_STATE_C2 ||
-		    cx->type == ACPI_STATE_C3) {
-			state->enter_dead = acpi_idle_play_dead;
-			if (cx->type != ACPI_STATE_C3)
-				drv->safe_state_index = count;
-		}
+
+		state->enter_dead = acpi_idle_play_dead;
+
+		if (cx->type == ACPI_STATE_C1 || cx->type == ACPI_STATE_C2)
+			drv->safe_state_index = count;
+
 		/*
 		 * Halt-induced C1 is not good for ->enter_s2idle, because it
 		 * re-enables interrupts on exit.  Moreover, C1 is generally not