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| author | SeongJae Park <sj38.park@gmail.com> | 2016-02-22 17:28:29 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-03-14 23:52:19 +0100 |
| commit | 65f95ff2e41a32dd190cf28e3abb029625eef968 (patch) | |
| tree | bf74a8b2d012d7b87b21b0e2720b773e6661d2cb /Documentation/memory-barriers.txt | |
| parent | documentation: Transitivity is not cumulativity (diff) | |
| download | linux-65f95ff2e41a32dd190cf28e3abb029625eef968.tar.xz linux-65f95ff2e41a32dd190cf28e3abb029625eef968.zip | |
documentation: Clarify compiler store-fusion example
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>
Diffstat (limited to 'Documentation/memory-barriers.txt')
| -rw-r--r-- | Documentation/memory-barriers.txt | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt index 8367d393cba2..3729cbe60e41 100644 --- a/Documentation/memory-barriers.txt +++ b/Documentation/memory-barriers.txt @@ -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 |