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

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Date:   Fri, 20 Jan 2017 19:26:31 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Joshua Clayton <stillcompiling@...il.com>
Cc:     kbuild-all@...org, Alan Tull <atull@...nsource.altera.com>,
        Moritz Fischer <moritz.fischer@...us.com>,
        Russell King <linux@...linux.org.uk>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Anatolij Gustschin <agust@...x.de>,
        Joshua Clayton <stillcompiling@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-fpga@...r.kernel.org
Subject: Re: [PATCH v7 2/3] fpga manager: Add cyclone-ps-spi driver for
 Altera FPGAs

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
config: alpha-allyesconfig (attached as .config)
compiler: alpha-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/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/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 +103 drivers/fpga/cyclone-ps-spi.c

    95		struct cyclonespi_conf *conf = (struct cyclonespi_conf *)mgr->priv;
    96		const char *fw_data = buf;
    97		const char *fw_data_end = fw_data + count;
    98	
    99		while (fw_data < fw_data_end) {
   100			int ret;
 > 101			size_t stride = min(fw_data_end - fw_data, SZ_4K);
   102	
 > 103			rev_buf(fw_data, stride);
   104			ret = spi_write(conf->spi, fw_data, stride);
   105			if (ret) {
   106				dev_err(&mgr->dev, "spi error in firmware write: %d\n",

---
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