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powerpc: protect cpu offlining by RCU offline lock #2

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Pull request for series with
subject: powerpc: protect cpu offlining by RCU offline lock
version: 1
url: https://patchwork.kernel.org/project/rcu/list/?series=676744

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Master branch: 2f91146
series: https://patchwork.kernel.org/project/rcu/list/?series=676744
version: 1

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Master branch: 80fc02e
series: https://patchwork.kernel.org/project/rcu/list/?series=676744
version: 1

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Master branch: 80fc02e
series: https://patchwork.kernel.org/project/rcu/list/?series=676744
version: 1

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Master branch: 80fc02e
series: https://patchwork.kernel.org/project/rcu/list/?series=676744
version: 1

Pull request is NOT updated. Failed to apply https://patchwork.kernel.org/project/rcu/list/?series=676744
error message:

Cmd('git') failed due to: exit code(128)
  cmdline: git am -3
  stderr: 'fatal: Dirty index: cannot apply patches (dirty: .github/workflows/test.yml)'

conflict:

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Master branch: 32fad12
series: https://patchwork.kernel.org/project/rcu/list/?series=676744
version: 1

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Master branch: 32fad12
series: https://patchwork.kernel.org/project/rcu/list/?series=676744
version: 1

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Master branch: 32fad12
series: https://patchwork.kernel.org/project/rcu/list/?series=676744
version: 1

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Master branch: 32fad12
series: https://patchwork.kernel.org/project/rcu/list/?series=676744
version: 1

@kernel-patches-bot kernel-patches-bot force-pushed the series/676744=>rcu-dev branch 7 times, most recently from 7d5f0ac to 46dc483 Compare October 20, 2022 06:45
@kernel-patches-bot kernel-patches-bot force-pushed the series/676744=>rcu-dev branch 12 times, most recently from b2ce6cd to 53bd5c6 Compare October 20, 2022 16:37
@zhouzhouyi-hub @chantra
powerpc: protect cpu offlining by RCU offline lock
8697218 
During the cpu offlining, the sub functions of xive_teardown_cpu will
call __lock_acquire when CONFIG_LOCKDEP=y. The latter function will
travel RCU protected list, so "WARNING: suspicious RCU usage" will be
triggered.

Try to protect cpu offlining by RCU offline lock.

Tested on PPC VM of Open Source Lab of Oregon State University.
(Each round of tests takes about 19 hours to finish)
Test results show that although "WARNING: suspicious RCU usage" has gone,
but there are more "BUG: soft lockup" reports than the original kernel
(10 vs 6), so I add a [RFC] to my subject line.

Signed-off-by: Zhouyi Zhou <[email protected]>
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@kernel-patches-bot @chantra @zhouzhouyi-hub