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documentation: Clarify compiler store-fusion example

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The compiler store-fusion example in memory-barriers.txt uses a C
comment to represent arbitrary code that does not update a given
variable.  Unfortunately, someone could reasonably interpret the
comment as instead referring to the following line of code.  This
commit therefore replaces the comment with a string that more
clearly represents the arbitrary code.

Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
SeongJae Park 2016-02-22 08:28:29 -08:00 committed by Paul E. McKenney
parent f36fe1e70b
commit 65f95ff2e4
1 changed files with 2 additions and 2 deletions
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Documentation/memory-barriers.txt
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@ -1550,7 +1550,7 @@ of optimizations:
the following:
a = 0;
/* Code that does not store to variable a. */
... Code that does not store to variable a ...
a = 0;
The compiler sees that the value of variable 'a' is already zero, so
@ -1562,7 +1562,7 @@ of optimizations:
wrong guess:
WRITE_ONCE(a, 0);
/* Code that does not store to variable a. */
... Code that does not store to variable a ...
WRITE_ONCE(a, 0);
(*) The compiler is within its rights to reorder memory accesses unless