Make checkpatch warn about pointless casting of kalloc returns.

[Dave Jones <davej@redhat.com>]

Make checkpatch warn about pointless casting of kalloc returns.

Signed-off-by: Dave Jones <davej@redhat.com>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 73751ab..c6cae6a 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1051,6 +1051,11 @@ sub process {
 				CHK("__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
 			}
 		}
+
+# check for pointless casting of kmalloc return
+		if ($rawline =~ /\*\)[ ]k[czm]alloc/) {
+			WARN("No need to cast return value.\n");
+		}
 	}
 
 	if ($chk_patch && !$is_patch) {
-- 
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