[PATCH tip/core/rcu 20/21] checkpatch: Add warnings for {smp_,}read_barrier_depends()

[Paul E. McKenney]

Now that both smp_read_barrier_depends() and read_barrier_depends()
are being de-emphasized, warn if any are added.

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Andy Whitcroft <apw@xxxxxxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
---
 scripts/checkpatch.pl | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 95cda3ecc66b..25f7098e2ad3 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5586,6 +5586,12 @@ sub process {
 			}
 		}
 
+# check for smp_read_barrier_depends and read_barrier_depends
+		if ($line =~ /\b(smp_|)read_barrier_depends\(/) {
+			WARN("READ_BARRIER_DEPENDS",
+			     "Dependency barriers should only be used in READ_ONCE or DEC Alpha code" . $herecurr);
+		}
+
 # check of hardware specific defines
 		if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
 			CHK("ARCH_DEFINES",
-- 
2.5.2