Re: [PATCH v7 2/3] fpga manager: Add cyclone-ps-spi driver for Altera FPGAs

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

Hi Joshua,

[auto build test WARNING on linus/master]
[also build test WARNING on v4.10-rc4 next-20170120]
[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/Joshua-Clayton/Altera-Cyclone-Passive-Serial-SPI-FPGA-Manager/20170120-172349
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

   include/linux/compiler.h:253:8: sparse: attribute 'no_sanitize_address': unknown attribute
>> drivers/fpga/cyclone-ps-spi.c:86:20: sparse: incompatible types in comparison expression (different signedness)
   drivers/fpga/cyclone-ps-spi.c:101:33: sparse: incompatible types in comparison expression (different type sizes)
   drivers/fpga/cyclone-ps-spi.c: In function 'rev_buf':
   drivers/fpga/cyclone-ps-spi.c:86:13: warning: comparison of distinct pointer types lacks a cast
     while (buf < fw_end) {
                ^
   In file included from include/linux/delay.h:10:0,
                    from drivers/fpga/cyclone-ps-spi.c:17:
   drivers/fpga/cyclone-ps-spi.c: In function 'cyclonespi_write':
   include/linux/kernel.h:753:16: warning: comparison of distinct pointer types lacks a cast
     (void) (&min1 == &min2);   \
                   ^
   include/linux/kernel.h:756:2: note: in expansion of macro '__min'
     __min(typeof(x), typeof(y),   \
     ^~~~~
   drivers/fpga/cyclone-ps-spi.c:101:19: note: in expansion of macro 'min'
      size_t stride = min(fw_data_end - fw_data, SZ_4K);
                      ^~~
   drivers/fpga/cyclone-ps-spi.c:103:11: warning: passing argument 1 of 'rev_buf' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
      rev_buf(fw_data, stride);
              ^~~~~~~
   drivers/fpga/cyclone-ps-spi.c:81:13: note: expected 'char *' but argument is of type 'const char *'
    static void rev_buf(char *buf, size_t len)
                ^~~~~~~

vim +86 drivers/fpga/cyclone-ps-spi.c

    70		gpiod_set_value(conf->config, 0);
    71		for (i = 0; i < (FPGA_MAX_DELAY / FPGA_MIN_DELAY); i++) {
    72			usleep_range(FPGA_MIN_DELAY, FPGA_MIN_DELAY + 20);
    73			if (!gpiod_get_value(conf->status))
    74				return 0;
    75		}
    76	
    77		dev_err(&mgr->dev, "Status pin not ready.\n");
    78		return -EIO;
    79	}
    80	
    81	static void rev_buf(char *buf, size_t len)
    82	{
    83		const u8 *fw_end = (buf + len);
    84	
    85		/* set buffer to lsb first */
  > 86		while (buf < fw_end) {
    87			*buf = bitrev8(*buf);
    88			buf++;
    89		}
    90	}
    91	
    92	static int cyclonespi_write(struct fpga_manager *mgr, const char *buf,
    93				    size_t count)
    94	{

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