[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 <paul...@linux.vnet.ibm.com>
Cc: Andy Whitcroft <a...@canonical.com>
Cc: Joe Perches <j...@perches.com>
---
 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