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Use the irq_get_nr_irqs() function instead of the global variable 'nr_irqs'. Cache the result of this function in a local variable in order not to rely on CSE (common subexpression elimination). Prepare for changing 'nr_irqs' from an exported global variable into a variable with file scope. Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/all/20241015190953.1266194-22-bvanassche@acm.org