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| author |   Mike Galbraith <umgwanakikbuti@gmail.com> | 2020-05-27 22:11:17 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2020-05-28 10:31:10 +0200 |
| commit | 3e92fd7bd2b8418b53cb7304855b8b69bedbe2b4 (patch) | |
| tree | 927d18b1edc42b24367726fbdeea650e5b182149 /tools/perf/scripts/python/exported-sql-viewer.py | |
| parent | squashfs: Make use of local lock in multi_cpu decompressor (diff) | |
| download | wireguard-linux-3e92fd7bd2b8418b53cb7304855b8b69bedbe2b4.tar.xz wireguard-linux-3e92fd7bd2b8418b53cb7304855b8b69bedbe2b4.zip | |
connector/cn_proc: Protect send_msg() with a local lock
send_msg() disables preemption to avoid out-of-order messages. As the
code inside the preempt disabled section acquires regular spinlocks,
which are converted to 'sleeping' spinlocks on a PREEMPT_RT kernel and
eventually calls into a memory allocator, this conflicts with the RT
semantics.
Convert it to a local_lock which allows RT kernels to substitute them with
a real per CPU lock. On non RT kernels this maps to preempt_disable() as
before. No functional change.
[bigeasy: Patch description]
Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20200527201119.1692513-6-bigeasy@linutronix.de
Diffstat (limited to 'tools/perf/scripts/python/exported-sql-viewer.py')
0 files changed, 0 insertions, 0 deletions