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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>
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 it is possible to use RCU to provide dynamic non-maskable interrupt
handlers, as well as dynamic irq handlers. This document describes handlers, as well as dynamic irq handlers. This document describes
how to do this, drawing loosely from Zwane Mwaikambo's NMI-timer 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 The relevant pieces of code are listed below, each followed by a
brief explanation:: brief explanation::
@ -116,7 +116,7 @@ Answer to Quick Quiz:
This same sad story can happen on other CPUs when using This same sad story can happen on other CPUs when using
a compiler with aggressive pointer-value speculation a compiler with aggressive pointer-value speculation
optimizations. optimizations. (But please don't!)
More important, the rcu_dereference_sched() makes it More important, the rcu_dereference_sched() makes it
clear to someone reading the code that the pointer is clear to someone reading the code that the pointer is