Merge tag 'lkmm.2022.12.02a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

Pull kernel memory model documentation updates from Paul McKenney:

 - Update the LKMM documentation, both in English and in Korean

* tag 'lkmm.2022.12.02a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
  docs/memory-barriers.txt/kokr: Fix confusing name of 'data dependency barrier'
  docs/memory-barriers.txt/kokr: Add memory barrier dma_mb()
  docs/memory-barriers.txt/kokr: introduce io_stop_wc() and add implementation for ARM64
  docs/memory-barriers.txt: Add a missed closing parenthesis
  tools/memory-model: Weaken ctrl dependency definition in explanation.txt

Documentation/memory-barriers.txt

@@ -1966,7 +1966,7 @@ There are some more advanced barrier functions:
  (*) io_stop_wc();
 
      For memory accesses with write-combining attributes (e.g. those returned
-     by ioremap_wc(), the CPU may wait for prior accesses to be merged with
+     by ioremap_wc()), the CPU may wait for prior accesses to be merged with
      subsequent ones. io_stop_wc() can be used to prevent the merging of
      write-combining memory accesses before this macro with those after it when
      such wait has performance implications.

tools/memory-model/Documentation/explanation.txt

@@ -464,9 +464,10 @@ to address dependencies, since the address of a location accessed
 through a pointer will depend on the value read earlier from that
 pointer.
 
-Finally, a read event and another memory access event are linked by a
-control dependency if the value obtained by the read affects whether
-the second event is executed at all.  Simple example:
+Finally, a read event X and a write event Y are linked by a control
+dependency if Y syntactically lies within an arm of an if statement and
+X affects the evaluation of the if condition via a data or address
+dependency (or similarly for a switch statement).  Simple example:
 
 	int x, y;