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doc: Update NMI-RCU.rst

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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>
This commit is contained in:
Paul E. McKenney 2022-11-04 11:00:14 -07:00
parent 438500113f
commit 8750dfe6fd
1 changed files with 2 additions and 2 deletions
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Documentation/RCU/NMI-RCU.rst
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@ -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