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| author | Paul E. McKenney <paulmck@kernel.org> | 2022-11-04 11:00:14 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2023-01-03 17:27:37 -0800 |
| commit | 8750dfe6fda4aca9cc02b3f652d14b14b49bccfb (patch) | |
| tree | cbf67e9396bd0ff1b45abd92ad625c44f7f34322 /Documentation/RCU | |
| parent | 438500113f375c0b3185cc7ce62baa5f8088a5b2 (diff) | |
| download | linux-8750dfe6fda4aca9cc02b3f652d14b14b49bccfb.tar.gz linux-8750dfe6fda4aca9cc02b3f652d14b14b49bccfb.tar.bz2 linux-8750dfe6fda4aca9cc02b3f652d14b14b49bccfb.zip | |
doc: Update NMI-RCU.rst
This commit updates NMI-RCU.rst to highlight the ancient heritage of
the example code and to discourage wanton compiler "optimizations".
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'Documentation/RCU')
| -rw-r--r-- | Documentation/RCU/NMI-RCU.rst | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/RCU/NMI-RCU.rst b/Documentation/RCU/NMI-RCU.rst index 2a92bc685ef1..dff60a80b386 100644 --- a/Documentation/RCU/NMI-RCU.rst +++ b/Documentation/RCU/NMI-RCU.rst @@ -8,7 +8,7 @@ Although RCU is usually used to protect read-mostly data structures, it is possible to use RCU to provide dynamic non-maskable interrupt handlers, as well as dynamic irq handlers. This document describes how to do this, drawing loosely from Zwane Mwaikambo's NMI-timer -work in "arch/x86/kernel/traps.c". +work in an old version of "arch/x86/kernel/traps.c". The relevant pieces of code are listed below, each followed by a brief explanation:: @@ -116,7 +116,7 @@ Answer to Quick Quiz: This same sad story can happen on other CPUs when using a compiler with aggressive pointer-value speculation - optimizations. + optimizations. (But please don't!) More important, the rcu_dereference_sched() makes it clear to someone reading the code that the pointer is |