[PATCH] checkpatch: Add exceptions for dsb keyword usage

[Prakruthi Deepak Heragu]

mb() API can relpace the dsb() API in the kernel code. So, dsb() usage
is discouraged. However, there are exceptions when dsb is used in a
variable or a function name. Exceptions are when 'dsb' is prefixed with
class [-_>*\.] and/or suffixed with class [-_\.;].

Signed-off-by: Prakruthi Deepak Heragu <pheragu@xxxxxxxxxxxxxx>
---
 scripts/checkpatch.pl | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index a9c0550..978c752 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5372,6 +5372,12 @@ sub process {
 			     "Avoid line continuations in quoted strings\n" . $herecurr);
 		}
 
+# dsb is too ARMish, and should usually be mb.
+        if ($line =~ /[^-_>*\.]\bdsb\b[^-_\.;]/) {
+            WARN("ARM_BARRIER",
+                 "Use of dsb is discouranged: prefer mb.\n" .
+                 $herecurr);
+		}
 # warn about #if 0
 		if ($line =~ /^.\s*\#\s*if\s+0\b/) {
 			CHK("REDUNDANT_CODE",
-- 
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