** Changed in: ubuntu-realtime
Status: New => In Progress
** Changed in: linux-realtime (Ubuntu)
Status: New => In Progress
** Changed in: linux-realtime (Ubuntu Noble)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/2089700
Title:
Fix PREEMPT_RT conflicts caused by 2024-09-30 noble patchset
Status in ubuntu-realtime:
In Progress
Status in linux-realtime package in Ubuntu:
In Progress
Status in linux-realtime source package in Noble:
In Progress
Bug description:
[Impact]
noble patchset 2024-09-30 (
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2083196 ) caused
conflicts and compilation failures with PREEMPT_RT.
[Fix]
One conflict was caused by 2fd5ad3f310de22836cdacae919dd99d758a1f1b
("perf: Fix event leak upon exit"). This was fixed by moving from the
v3 version of the "perf/sigtrap" patchset from PREEMPT_RT 6.8.2-rt11
to the final v5 version of the patchset that made it into 6.11. This
final "perf/sigtrap" patchset from mainline 6.11 included the
following commits, which applied cleanly:
058244c683111d44a5de16ac74f19a1754dd7a0c perf: Move irq_work_queue() where
the event is prepared.
466e4d801cd438a1ab2c8a2cce1bef6b65c31bbb task_work: Add TWA_NMI_CURRENT as an
additional notify mode.
c5d93d23a26012a98b77f9e354ab9b3afd420059 perf: Enqueue SIGTRAP always via
task_work.
5af42f928f3ac555c228740fb4a92d05b19fdd49 perf: Shrink the size of the
recursion counter.
0d40a6d83e3e6751f1107ba33587262d937c969f perf: Move swevent_htable::recursion
into task_struct.
16b9569df9d2ab07eeee075cb7895e9d3e08e8f0 perf: Don't disable preemption in
perf_pending_task().
2b84def990d388bed4afe4f21ae383a01991046c perf: Split __perf_pending_irq() out
of perf_pending_irq()
The other issue was a compilation failure due to f70405afc99b1
("locking: Add rwsem_assert_held() and rwsem_assert_held_write()").
This was fixed by the fix commit from 6.9, which applied cleanly:
fa1f51162338b3e2f520d4bfedc42b3b2e00da6d locking: Make
rwsem_assert_held_write_nolockdep() build with PREEMPT_RT=y
[Test Case]
Compile and boot test.
[Where things could go wrong]
If there are patches these depend on that are missed, it could cause
performance/latency regressions.
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