linux-kernel - Re: PowerPC guest getting "BUG: scheduling while atomic" on linux-next-20210623 during secondary CPUs bringup

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Date:   Fri, 25 Jun 2021 18:02:31 +0530
From:   Bharata B Rao <bharata@...ux.ibm.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        linux-next@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        LKML <linux-kernel@...r.kernel.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: PowerPC guest getting "BUG: scheduling while atomic" on
 linux-next-20210623 during secondary CPUs bringup

On Fri, Jun 25, 2021 at 12:16:52PM +0200, Peter Zijlstra wrote:
> You mean: CONFIG_PREEMPTION=n, what about CONFIG_PREEMPT_COUNT?
> 
> Because if both are =n, then I don't see how that warning could trigger.
> in_atomic_preempt_off() would then result in prempt_count() == 0, and
> per the print above, it *is* 0.

CONFIG_PREEMPTION isn't set.

Also other PREEMPT related options are as under:

# CONFIG_PREEMPT_NONE is not set
CONFIG_PREEMPT_VOLUNTARY=y
# CONFIG_PREEMPT is not set
CONFIG_PREEMPT_COUNT=y
CONFIG_PREEMPT_NOTIFIERS=y
CONFIG_PREEMPTIRQ_TRACEPOINTS=y
# CONFIG_PREEMPTIRQ_DELAY_TEST is not set

Regards,
Bharata.