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Date:   Sat, 24 Mar 2018 19:43:47 +0800
From:   kbuild test robot <lkp@intel.com>
To:     Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com>
Cc:     kbuild-all@01.org, jakob.unterwurzacher@theobroma-systems.com,
        Martin Elshuber <martin.elshuber@theobroma-systems.com>,
        Philipp Tomsich <philipp.tomsich@theobroma-systems.com>,
        Wolfgang Grandegger <wg@grandegger.com>,
        Marc Kleine-Budde <mkl@pengutronix.de>,
        linux-can@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 1/1] can: ucan: add driver for Theobroma Systems UCAN
 devices
Message-ID: <201803241907.upf6wIeD%fengguang.wu@intel.com>
References: <20180322135338.60923-2-jakob.unterwurzacher@theobroma-systems.com>
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In-Reply-To: <20180322135338.60923-2-jakob.unterwurzacher@theobroma-systems.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi Jakob,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]
[also build test WARNING on v4.16-rc6]
[cannot apply to next-20180323]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Jakob-Unterwurzacher/can-ucan-add-driver-for-Theobroma-Systems-UCAN-devices/20180324-164143
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/net/can/usb/ucan.c:301:16: sparse: restricted __le32 degrades to integer
   drivers/net/can/usb/ucan.c:414:32: sparse: incorrect type in argument 5 (different base types) @@    expected unsigned short [unsigned] [usertype] value @@    got  short [unsigned] [usertype] value @@
   drivers/net/can/usb/ucan.c:414:32:    expected unsigned short [unsigned] [usertype] value
   drivers/net/can/usb/ucan.c:414:32:    got restricted __le16 [usertype] <noident>
   drivers/net/can/usb/ucan.c:428:32: sparse: incorrect type in argument 5 (different base types) @@    expected unsigned short [unsigned] [usertype] value @@    got  short [unsigned] [usertype] value @@
   drivers/net/can/usb/ucan.c:428:32:    expected unsigned short [unsigned] [usertype] value
   drivers/net/can/usb/ucan.c:428:32:    got restricted __le16 [usertype] <noident>
   drivers/net/can/usb/ucan.c:683:44: sparse: incorrect type in argument 2 (different base types) @@    expected unsigned long [unsigned] [usertype] size @@    got d long [unsigned] [usertype] size @@
   drivers/net/can/usb/ucan.c:683:44:    expected unsigned long [unsigned] [usertype] size
   drivers/net/can/usb/ucan.c:683:44:    got restricted __le16 [usertype] wMaxPacketSize
   drivers/net/can/usb/ucan.c:700:44: sparse: incorrect type in argument 2 (different base types) @@    expected unsigned long [unsigned] [usertype] size @@    got d long [unsigned] [usertype] size @@
   drivers/net/can/usb/ucan.c:700:44:    expected unsigned long [unsigned] [usertype] size
   drivers/net/can/usb/ucan.c:700:44:    got restricted __le16 [usertype] wMaxPacketSize
   drivers/net/can/usb/ucan.c:752:25: sparse: cast to restricted __le16
   drivers/net/can/usb/ucan.c:779:36: sparse: incorrect type in argument 5 (different base types) @@    expected int [signed] buffer_length @@    got restricted __le1int [signed] buffer_length @@
   drivers/net/can/usb/ucan.c:779:36:    expected int [signed] buffer_length
   drivers/net/can/usb/ucan.c:779:36:    got restricted __le16 [usertype] wMaxPacketSize
   drivers/net/can/usb/ucan.c:793:54: sparse: incorrect type in argument 2 (different base types) @@    expected unsigned long [unsigned] [usertype] size @@    got d long [unsigned] [usertype] size @@
   drivers/net/can/usb/ucan.c:793:54:    expected unsigned long [unsigned] [usertype] size
   drivers/net/can/usb/ucan.c:793:54:    got restricted __le16 [usertype] wMaxPacketSize
   drivers/net/can/usb/ucan.c:853:62: sparse: incorrect type in argument 2 (different base types) @@    expected unsigned long [unsigned] [usertype] size @@    got d long [unsigned] [usertype] size @@
   drivers/net/can/usb/ucan.c:853:62:    expected unsigned long [unsigned] [usertype] size
   drivers/net/can/usb/ucan.c:853:62:    got restricted __le16 [usertype] wMaxPacketSize
   drivers/net/can/usb/ucan.c:877:61: sparse: incorrect type in argument 2 (different base types) @@    expected unsigned long [unsigned] [usertype] size @@    got d long [unsigned] [usertype] size @@
   drivers/net/can/usb/ucan.c:877:61:    expected unsigned long [unsigned] [usertype] size
   drivers/net/can/usb/ucan.c:877:61:    got restricted __le16 [usertype] wMaxPacketSize
   drivers/net/can/usb/ucan.c:891:44: sparse: incorrect type in argument 5 (different base types) @@    expected int [signed] buffer_length @@    got restricted __le1int [signed] buffer_length @@
   drivers/net/can/usb/ucan.c:891:44:    expected int [signed] buffer_length
   drivers/net/can/usb/ucan.c:891:44:    got restricted __le16 [usertype] wMaxPacketSize
>> drivers/net/can/usb/ucan.c:1238:41: sparse: incorrect type in assignment (different base types) @@    expected restricted __le16 [usertype] sample_point @@    got restricted __le16 [usertype] sample_point @@
   drivers/net/can/usb/ucan.c:1238:41:    expected restricted __le16 [usertype] sample_point
   drivers/net/can/usb/ucan.c:1238:41:    got restricted __le32 [usertype] <noident>
   drivers/net/can/usb/ucan.c:1368:18: sparse: restricted __le16 degrades to integer
   drivers/net/can/usb/ucan.c:1373:19: sparse: restricted __le16 degrades to integer
   drivers/net/can/usb/ucan.c:1407:31: sparse: incorrect type in argument 5 (different base types) @@    expected unsigned short [unsigned] [usertype] value @@    got  short [unsigned] [usertype] value @@
   drivers/net/can/usb/ucan.c:1407:31:    expected unsigned short [unsigned] [usertype] value
   drivers/net/can/usb/ucan.c:1407:31:    got restricted __le16 [usertype] <noident>
   drivers/net/can/usb/ucan.c:1448:31: sparse: incorrect type in argument 5 (different base types) @@    expected unsigned short [unsigned] [usertype] value @@    got  short [unsigned] [usertype] value @@
   drivers/net/can/usb/ucan.c:1448:31:    expected unsigned short [unsigned] [usertype] value
   drivers/net/can/usb/ucan.c:1448:31:    got restricted __le16 [usertype] <noident>

vim +301 drivers/net/can/usb/ucan.c

   298	
   299	static u8 ucan_get_can_dlc(struct ucan_can_msg *msg, u16 len)
   300	{
 > 301		if (msg->id & CAN_RTR_FLAG)
   302			return get_can_dlc(msg->dlc);
   303		else
   304			return get_can_dlc(len - (UCAN_IN_HDR_SIZE + sizeof(msg->id)));
   305	}
   306	

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