linux-kernel - Re: [oliver.sang@...el.com: [cpumask] b9a7ecc71f: WARNING:at_include/linux/cpumask.h:#__is_kernel_percpu

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Date:   Tue, 11 Oct 2022 10:23:27 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     Andrew Jones <ajones@...tanamicro.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>, lkp@...ts.01.org,
        lkp@...el.com, Linux Memory Management List <linux-mm@...ck.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [oliver.sang@...el.com: [cpumask] b9a7ecc71f:
 WARNING:at_include/linux/cpumask.h:#__is_kernel_percpu_address]

On Tue, Oct 11, 2022 at 10:16:03AM -0700, Yury Norov wrote:
> > Hi Yury,
> > 
> > I just wanted to report that the warning fires when doing
> > 'cat /proc/cpuinfo' on at least x86 and riscv. I don't think
> > those are false positives. I'm guessing a patch should be
> > something like the following diff. If you haven't already
> > addressed this and I'm not off in left field, then I guess
> > we should integrate it into your series.
> > 
> > Thanks,
> > drew
>  
> Hi Andrew,
> 
> Can you please send it as a patch with a description?

Also, can you describe why we'd silence the warning this way?
If the cpu number greater than nr_cpu_ids comes from upper layer,
we quite probably should investigate what happens there...

Thanks,
Yury