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| author | Paul E. McKenney <paulmck@kernel.org> | 2023-11-25 01:55:37 +0300 |
|---|---|---|
| committer | Boqun Feng <boqun.feng@gmail.com> | 2024-02-14 18:53:49 +0300 |
| commit | 120311acb01d7360dcc70c0862c83758fbcd28d2 (patch) | |
| tree | 57c50d1c5e3b886e2daadbd3924bbd5628226880 /tools/perf/scripts/python/stackcollapse.py | |
| parent | 41bccc98fb7931d63d03f326a746ac4d429c1dd3 (diff) | |
| download | linux-120311acb01d7360dcc70c0862c83758fbcd28d2.tar.xz | |
doc: Spinlocks are implied RCU readers
In kernels built with CONFIG_PREEMPT_RT=n, spinlock critical sections
are RCU readers because they disable preemption. However, they are also
RCU readers in CONFIG_PREEMPT_RT=y because the -rt locking primitives
contain rcu_read_lock() and rcu_read_unlock(). Therefore, upgrade
rcu_dereference.rst to document this non-obvious case.
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Closes: https://lore.kernel.org/lkml/CAHk-=whGKvjHCtJ6W4pQ0_h_k9fiFQ8V2GpM=BqYnB2X=SJ+XQ@mail.gmail.com/
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
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