linux-kernel - [Bug report] Hit false positives bug with script/checkpatch.pl

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Date:	Wed, 16 Jul 2014 10:50:36 +0800
From:	Ethan Zhao <ethan.zhao@...cle.com>
To:	joe@...ches.com, anish@...lsio.com, apw@...onical.com
Cc:	linux-kernel@...r.kernel.org, ethan.kernel@...il.com,
	joe.jin@...cle.com
Subject: [Bug report] Hit false positives bug with script/checkpatch.pl

Hi,
     I hit a false positives bug when run script/checkpatch.pl to my patch,
It reported  errors to following macro definition, but in fact the macro is
correct, I couldn't change that macro according to the error message output
by script/checkpatch.pl. because of this bug, my patch was rejected by some
guy's patchwork.

--
 ./scripts/checkpatch.pl netxen.patch
ERROR: Macros with complex values should be enclosed in parenthesis
#38: FILE: drivers/net/ethernet/qlogic/netxen/netxen_nic_ethtool.c:45:
+#define NETXEN_NIC_STAT(m)     NETXEN_STATS, \
+                       sizeof(((struct netxen_adapter *)0)->m), \
                        offsetof(struct netxen_adapter, m)

ERROR: Macros with complex values should be enclosed in parenthesis
#42: FILE: drivers/net/ethernet/qlogic/netxen/netxen_nic_ethtool.c:49:
+#define NETXEN_NETDEV_STAT(m)  NETDEV_STATS, \
+                       sizeof(((struct rtnl_link_stats64 *)0)->m), \
+                       offsetof(struct rtnl_link_stats64, m)

total: 2 errors, 0 warnings, 62 lines checked

netxen.patch has style problems, please review.

If any of these errors are false positives, please report
--

Please check and fix it.




Thanks,
Ethan








---------------------the sample patch ------
From: Ethan Zhao <ethan.zhao@...cle.com>

netxen driver has implemented netxen_nic_get_ethtool_stats() interface,
but it doesn't collect stats.rxdropped in driver, so we will get
different rx_dropped statistic information while using ifconfig and ethtool.
this patch fills stats.rxdropped field with data from net core
with dev_get_stats() just as ixgbe driver did for some of its stats.

V2: only fix the stats.rxdropped field.

Tested with last netxen 4.0.82
Compiled with net-next branch 3.16-rc2

Signed-off-by: Ethan Zhao <ethan.zhao@...cle.com>
Tested-by: Sriharsha Yadagudde <sriharsha.devdas@...cle.com>
---
 .../ethernet/qlogic/netxen/netxen_nic_ethtool.c    |   34 +++++++++++++++++---
 1 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_ethtool.c b/drivers/net/ethernet/qlogic/netxen/netxen_nic_ethtool.c
index 4ca2c19..49e6a1b 100644
--- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_ethtool.c
+++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_ethtool.c
@@ -33,22 +33,30 @@
 #include "netxen_nic.h"
 #include "netxen_nic_hw.h"
 
+enum {NETDEV_STATS, NETXEN_STATS};
+
 struct netxen_nic_stats {
 	char stat_string[ETH_GSTRING_LEN];
+	int type;
 	int sizeof_stat;
 	int stat_offset;
 };
 
-#define NETXEN_NIC_STAT(m) sizeof(((struct netxen_adapter *)0)->m), \
+#define NETXEN_NIC_STAT(m)	NETXEN_STATS, \
+			sizeof(((struct netxen_adapter *)0)->m), \
 			offsetof(struct netxen_adapter, m)
 
+#define NETXEN_NETDEV_STAT(m)	NETDEV_STATS, \
+			sizeof(((struct rtnl_link_stats64 *)0)->m), \
+			offsetof(struct rtnl_link_stats64, m)
+
 #define NETXEN_NIC_PORT_WINDOW 0x10000
 #define NETXEN_NIC_INVALID_DATA 0xDEADBEEF
 
 static const struct netxen_nic_stats netxen_nic_gstrings_stats[] = {
 	{"xmit_called", NETXEN_NIC_STAT(stats.xmitcalled)},
 	{"xmit_finished", NETXEN_NIC_STAT(stats.xmitfinished)},
-	{"rx_dropped", NETXEN_NIC_STAT(stats.rxdropped)},
+	{"rx_dropped", NETXEN_NETDEV_STAT(rx_dropped)},
 	{"tx_dropped", NETXEN_NIC_STAT(stats.txdropped)},
 	{"csummed", NETXEN_NIC_STAT(stats.csummed)},
 	{"rx_pkts", NETXEN_NIC_STAT(stats.rx_pkts)},
@@ -679,11 +687,27 @@ netxen_nic_get_ethtool_stats(struct net_device *dev,
 {
 	struct netxen_adapter *adapter = netdev_priv(dev);
 	int index;
+	struct rtnl_link_stats64 temp;
+	const struct rtnl_link_stats64 *net_stats;
+	char *p = NULL;
 
+	net_stats = dev_get_stats(dev, &temp);
 	for (index = 0; index < NETXEN_NIC_STATS_LEN; index++) {
-		char *p =
-		    (char *)adapter +
-		    netxen_nic_gstrings_stats[index].stat_offset;
+
+		switch (netxen_nic_gstrings_stats[index].type) {
+		case NETDEV_STATS:
+			p = (char *)net_stats +
+				netxen_nic_gstrings_stats[index].stat_offset;
+			break;
+		case NETXEN_STATS:
+			p = (char *)adapter +
+				netxen_nic_gstrings_stats[index].stat_offset;
+			break;
+		default:
+			data[index] = 0;
+			continue;
+		}
+
 		data[index] =
 		    (netxen_nic_gstrings_stats[index].sizeof_stat ==
 		     sizeof(u64)) ? *(u64 *) p : *(u32 *) p;
-- 1.7.1 
--
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