linux-kernel - [PATCH] checkpatch: Prefer ether_addr_copy to memcpy(foo, bar, ETH

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Message-ID: <1390341089.31946.14.camel@joe-AO722>
Date:	Tue, 21 Jan 2014 13:51:29 -0800
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Whitcroft <apw@...onical.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] checkpatch: Prefer ether_addr_copy to memcpy(foo, bar,
 ETH_ALEN)

ether_addr_copy was added for kernel version 3.14.
It's slightly smaller/faster for some arches.
Encourage its use.

Signed-off-by: Joe Perches <joe@...ches.com>
---
 scripts/checkpatch.pl | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index be53ba7..0ea2a1e 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4096,6 +4096,16 @@ sub process {
 			}
 		}
 
+# Check for memcpy(foo, bar, ETH_ALEN) that could be ether_addr_copy(foo, bar)
+		if ($^V && $^V ge 5.10.0 &&
+		    $line =~ /^\+(?:.*?)\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/s) {
+			if (WARN("PREFER_ETHER_ADDR_COPY",
+				 "Prefer ether_addr_copy() over memcpy() if the Ethernet addresses are __aligned(2)\n" . $herecurr) &&
+			    $fix) {
+				$fixed[$linenr - 1] =~ s/\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/ether_addr_copy($2, $7)/;
+			}
+		}
+
 # typecasts on min/max could be min_t/max_t
 		if ($^V && $^V ge 5.10.0 &&
 		    defined $stat &&


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