[PATCH v3 1/4] checkpatch: suggest using ether_addr_equal*()

[Mateusz Kulikowski <mateusz.kulikowski@gmail.com>]

Check if memcmp() is used to compare ethernet addresses and suggest
using ether_addr_equal() or ether_addr_equal_unaligned()

Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
---
 scripts/checkpatch.pl | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 89b1df4..0a511b7 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5035,6 +5035,14 @@ sub process {
 			}
 		}
 
+# Check for memcmp(foo, bar, ETH_ALEN) that could be ether_addr_equal*(foo, bar)
+		if ($^V && $^V ge 5.10.0 &&
+		    defined $stat &&
+		    $stat =~ /^\+(?:.*?)\bmemcmp\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) {
+			WARN("PREFER_ETHER_ADDR_EQUAL",
+			     "Prefer ether_addr_equal() or ether_addr_equal_unaligned() over memcmp()\n" . "$here\n$stat\n")
+		}
+
 # typecasts on min/max could be min_t/max_t
 		if ($^V && $^V ge 5.10.0 &&
 		    defined $stat &&
-- 
1.8.4.1