Public bug reported:
* Explain the bug
RCU_SOFTIRQ used to be special in that it could be raised on purpose
within the idle path to prevent from stopping the tick. Some code still
prevents from unnecessary warnings related to this specific behaviour
while entering in dynticks-idle mode.
However the nohz layout has changed quite a bit in ten years, and the
removal of CONFIG_RCU_FAST_NO_HZ has been the final straw to this
safe-conduct. Now the RCU_SOFTIRQ vector is expected to be raised from
sane places.
* Brief explanation of fixes
Stop allowing RCU_SOFTIRQ in idle
* How to test
In boot dmesg, the warning should be gone.
* What it could break.
N/A
** Affects: linux-bluefield (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1998857
Title:
tick/rcu: Stop allowing RCU_SOFTIRQ in idle
Status in linux-bluefield package in Ubuntu:
New
Bug description:
* Explain the bug
RCU_SOFTIRQ used to be special in that it could be raised on purpose
within the idle path to prevent from stopping the tick. Some code still
prevents from unnecessary warnings related to this specific behaviour
while entering in dynticks-idle mode.
However the nohz layout has changed quite a bit in ten years, and the
removal of CONFIG_RCU_FAST_NO_HZ has been the final straw to this
safe-conduct. Now the RCU_SOFTIRQ vector is expected to be raised from
sane places.
* Brief explanation of fixes
Stop allowing RCU_SOFTIRQ in idle
* How to test
In boot dmesg, the warning should be gone.
* What it could break.
N/A
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https://bugs.launchpad.net/ubuntu/+source/linux-bluefield/+bug/1998857/+subscriptions
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