Re: [PATCH v2 2/2] fpga: Add support for Xilinx LogiCORE PR Decoupler

[kbuild test robot <lkp@intel.com>]

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Hi Moritz,

[auto build test WARNING on linus/master]
[also build test WARNING on v4.11-rc2 next-20170310]
[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/Moritz-Fischer/doc-Add-bindings-document-for-Xilinx-LogiCore-PR-Decoupler/20170320-005406
config: alpha-allyesconfig (attached as .config)
compiler: alpha-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=alpha 

All warnings (new ones prefixed by >>):

   drivers/fpga/xilinx-pr-decoupler.c: In function 'xlnx_pr_decoupler_enable_set':
>> drivers/fpga/xilinx-pr-decoupler.c:26:26: warning: large integer implicitly truncated to unsigned type [-Woverflow]
    #define CTRL_CMD_COUPLE  ~BIT(0)
                             ^
>> drivers/fpga/xilinx-pr-decoupler.c:43:10: note: in expansion of macro 'CTRL_CMD_COUPLE'
      writel(CTRL_CMD_COUPLE, priv->io_base);
             ^~~~~~~~~~~~~~~

vim +26 drivers/fpga/xilinx-pr-decoupler.c

    20	#include <linux/kernel.h>
    21	#include <linux/of_device.h>
    22	#include <linux/module.h>
    23	#include <linux/fpga/fpga-bridge.h>
    24	
    25	#define CTRL_CMD_DECOUPLE	BIT(0)
  > 26	#define CTRL_CMD_COUPLE		~BIT(0)
    27	
    28	struct xlnx_pr_decoupler_data {
    29		void __iomem *io_base;
    30		struct clk *clk;
    31	};
    32	
    33	static int xlnx_pr_decoupler_enable_set(struct fpga_bridge *bridge, bool enable)
    34	{
    35		int err;
    36		struct xlnx_pr_decoupler_data *priv = bridge->priv;
    37	
    38		err = clk_enable(priv->clk);
    39		if (err)
    40			return err;
    41	
    42		if (enable)
  > 43			writel(CTRL_CMD_COUPLE, priv->io_base);
    44		else
    45			writel(CTRL_CMD_DECOUPLE, priv->io_base);
    46	

---
0-DAY kernel test infrastructure                Open Source Technology Center
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