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Date:   Sat, 22 Aug 2020 13:35:10 +0200
From:   Thomas Gleixner <>
To:     Yunfeng Ye <>
Cc:, Shiyuan Hu <>,
        Hewenliang <>,
        Marc Zyngier <>
Subject: Re: [PATCH] genirq/proc: Show percpu irq affinity

On Sat, Aug 22 2020 at 17:33, Yunfeng Ye wrote:
> On 2020/8/13 16:27, Thomas Gleixner wrote:
> For example, the cmdline "irqaffinity=0,1,126,127" on the 128 cores system´╝Ü
> [root@...alhost ~]# cat /proc/irq/4/smp_affinity_list
> 0-1,126-127
> The irq 4 is "arch_timer" interrupt, which is a percpu interrupt.
> So is it necessary to show the percpu irq affinity correct?

Yes, it makes sense to do so, but you used the wrong check. The correct
one is:


which will not wreckage the output for other per cpu marked interrupts
which never set the percpu_affinity pointer with the obvious
consequences... The pointer would need a NULL check in any case, but it
might be more straight forward to update affinity when percpu_affinity
is initialized. Haven't looked in detail though.



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