ERROR: modpost: "bcsr_mod" [drivers/pcmcia/db1xxx_ss.ko] undefined!

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

Hi Arnd,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e783362eb54cd99b2cac8b3a9aeac942e6f6ac07
commit: 606b102876e3741851dfb09d53f3ee57f650a52c drm: fb_helper: fix CONFIG_FB dependency
date:   4 months ago
config: mips-randconfig-r002-20220120 (https://download.01.org/0day-ci/archive/20220123/202201231941.OMnmf2JQ-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project f7b7138a62648f4019c55e4671682af1f851f295)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=606b102876e3741851dfb09d53f3ee57f650a52c
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 606b102876e3741851dfb09d53f3ee57f650a52c
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All error/warnings (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "bcsr_mod" [drivers/pcmcia/db1xxx_ss.ko] undefined!
>> ERROR: modpost: "bcsr_read" [drivers/pcmcia/db1xxx_ss.ko] undefined!
--
arch/mips/boot/compressed/decompress.c:42:6: warning: no previous prototype for function 'error' [-Wmissing-prototypes]
void error(char *x)
^
arch/mips/boot/compressed/decompress.c:42:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void error(char *x)
^
static
In file included from arch/mips/boot/compressed/decompress.c:64:
In file included from arch/mips/boot/compressed/../../../../lib/decompress_unlz4.c:10:
>> arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c:506:5: warning: no previous prototype for function 'LZ4_decompress_safe_forceExtDict' [-Wmissing-prototypes]
int LZ4_decompress_safe_forceExtDict(const char *source, char *dest,
^
arch/mips/boot/compressed/../../../../lib/lz4/lz4_decompress.c:506:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int LZ4_decompress_safe_forceExtDict(const char *source, char *dest,
^
static
arch/mips/boot/compressed/decompress.c:85:6: warning: no previous prototype for function '__stack_chk_fail' [-Wmissing-prototypes]
void __stack_chk_fail(void)
^
arch/mips/boot/compressed/decompress.c:85:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void __stack_chk_fail(void)
^
static
arch/mips/boot/compressed/decompress.c:90:6: warning: no previous prototype for function 'decompress_kernel' [-Wmissing-prototypes]
void decompress_kernel(unsigned long boot_heap_start)
^
arch/mips/boot/compressed/decompress.c:90:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void decompress_kernel(unsigned long boot_heap_start)
^
static
4 warnings generated.

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org