From: Yong Zhang <yong.zhang0@xxxxxxxxx> Date: Tue, 29 May 2012 16:27:33 +0800 > From: Yong Zhang <yong.zhang@xxxxxxxxxxxxx> > Date: Tue, 29 May 2012 12:56:08 +0800 > Subject: [UPDATED] [RFC PATCH 8/10] SPARC: smp: remove call to > ipi_call_lock_irq()/ipi_call_unlock_irq() > > 1) call_function.lock used in smp_call_function_many() is just to protect > call_function.queue and &data->refs, cpu_online_mask is outside of the > lock. And it's not necessary to protect cpu_online_mask, > because data->cpumask is pre-calculate and even if a cpu is brougt up > when calling arch_send_call_function_ipi_mask(), it's harmless because > validation test in generic_smp_call_function_interrupt() will take care > of it. > > 2) For cpu down issue, stop_machine() will guarantee that no concurrent > smp_call_fuction() is processing. > > And also delay irq enable to after set_cpu_online(). > > Signed-off-by: Yong Zhang <yong.zhang0@xxxxxxxxx> Acked-by: David S. Miller <davem@xxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
