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| author | Wei Li <liwei391@huawei.com> | 2024-09-24 17:45:14 +0800 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2024-10-03 16:43:23 -0400 |
| commit | 2a13ca2e8abb12ee43ada8a107dadca83f140937 (patch) | |
| tree | 46b1f2c0fe819db33b9bdee5f0f55ab3862a2d95 /tools/perf/scripts/python/exported-sql-viewer.py | |
| parent | 829e0c9f0855f26b3ae830d17b24aec103f7e915 (diff) | |
tracing/hwlat: Fix a race during cpuhp processing
The cpuhp online/offline processing race also exists in percpu-mode hwlat
tracer in theory, apply the fix too. That is:
T1 | T2
[CPUHP_ONLINE] | cpu_device_down()
hwlat_hotplug_workfn() |
| cpus_write_lock()
| takedown_cpu(1)
| cpus_write_unlock()
[CPUHP_OFFLINE] |
cpus_read_lock() |
start_kthread(1) |
cpus_read_unlock() |
Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20240924094515.3561410-5-liwei391@huawei.com
Fixes: ba998f7d9531 ("trace/hwlat: Support hotplug operations")
Signed-off-by: Wei Li <liwei391@huawei.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'tools/perf/scripts/python/exported-sql-viewer.py')
0 files changed, 0 insertions, 0 deletions