Hi Paul,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.8-rc1 next-20160809]
[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/Paul-Burton/MIPS-SEAD3-device-tree-conversion/20160809-204707
config: mips-sead3_defconfig (attached as .config)
compiler: mipsel-linux-gnu-gcc (Debian 5.4.0-6) 5.4.0 20160609
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=mips 

Note: the linux-review/Paul-Burton/MIPS-SEAD3-device-tree-conversion/20160809-204707 HEAD 0eed2040422cad5cd9998891bc53368a6f15871c builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   arch/mips/mti-sead3/sead3-dtshim.c: In function 'remove_gic':
   arch/mips/mti-sead3/sead3-dtshim.c:56:11: error: 'EINVAL' undeclared (first use in this function)
      return -EINVAL;
              ^
   arch/mips/mti-sead3/sead3-dtshim.c:56:11: note: each undeclared identifier is reported only once for each function it appears in
   arch/mips/mti-sead3/sead3-dtshim.c: In function 'serial_config':
   arch/mips/mti-sead3/sead3-dtshim.c:94:13: error: implicit declaration of function 'fw_getenv' [-Werror=implicit-function-declaration]
     yamontty = fw_getenv("yamontty");
                ^

quoted

arch/mips/mti-sead3/sead3-dtshim.c:94:11: error: assignment makes pointer from integer without a cast [-Werror=int-conversion]

     yamontty = fw_getenv("yamontty");
              ^
   arch/mips/mti-sead3/sead3-dtshim.c:110:11: error: assignment makes pointer from integer without a cast [-Werror=int-conversion]
     mode_var = fw_getenv(mode_var_name);
              ^
   cc1: all warnings being treated as errors

vim +94 arch/mips/mti-sead3/sead3-dtshim.c

    88		const char *yamontty, *mode_var;
    89		char mode_var_name[9], path[18], parity;
    90		unsigned int uart, baud, stop_bits;
    91		bool hw_flow;
    92		int chosen_off, err;
    93	
  > 94		yamontty = fw_getenv("yamontty");
    95		if (!yamontty || !strcmp(yamontty, "tty0")) {
    96			uart = 0;
    97		} else if (!strcmp(yamontty, "tty1")) {

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