[jimc:dyn-drm-trc 21/21] include/linux/dynamic_debug.h:224:6: error: implicit declaration of function 'strstr'

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

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tree:   https://github.com/jimc/linux.git dyn-drm-trc
head:   d095bc48a714958c8a3e66a52aad303bfec99c6e
commit: d095bc48a714958c8a3e66a52aad303bfec99c6e [21/21] dyndbg: drop 3 includes
config: x86_64-randconfig-a002 (https://download.01.org/0day-ci/archive/20220127/202201270854.qNAMI0ad-lkp(a)intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/jimc/linux/commit/d095bc48a714958c8a3e66a52aad303bfec99c6e
        git remote add jimc https://github.com/jimc/linux.git
        git fetch --no-tags jimc dyn-drm-trc
        git checkout d095bc48a714958c8a3e66a52aad303bfec99c6e
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/net/ethernet/pensando/ionic/

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 >>):

   In file included from drivers/net/ethernet/pensando/ionic/ionic_main.c:5:
   include/linux/dynamic_debug.h: In function 'ddebug_dyndbg_module_param_cb':
>> include/linux/dynamic_debug.h:224:6: error: implicit declaration of function 'strstr' [-Werror=implicit-function-declaration]
     224 |  if (strstr(param, "dyndbg")) {
         |      ^~~~~~
>> include/linux/dynamic_debug.h:224:6: warning: incompatible implicit declaration of built-in function 'strstr'
   include/linux/dynamic_debug.h:7:1: note: include '<string.h>' or provide a declaration of 'strstr'
       6 | #include <linux/jump_label.h>
     +++ |+#include <string.h>
       7 | #endif
>> include/linux/dynamic_debug.h:230:10: error: 'EINVAL' undeclared (first use in this function)
     230 |  return -EINVAL;
         |          ^~~~~~
   include/linux/dynamic_debug.h:230:10: note: each undeclared identifier is reported only once for each function it appears in
   cc1: some warnings being treated as errors


vim +/strstr +224 include/linux/dynamic_debug.h

e9d376f0fa66bd Jason Baron 2009-02-05  220  
b48420c1d3019c Jim Cromie  2012-04-27  221  static inline int ddebug_dyndbg_module_param_cb(char *param, char *val,
b48420c1d3019c Jim Cromie  2012-04-27  222  						const char *modname)
b48420c1d3019c Jim Cromie  2012-04-27  223  {
b48420c1d3019c Jim Cromie  2012-04-27 @224  	if (strstr(param, "dyndbg")) {
516cf1be07cf3a Jim Cromie  2012-05-01  225  		/* avoid pr_warn(), which wants pr_fmt() fully defined */
516cf1be07cf3a Jim Cromie  2012-05-01  226  		printk(KERN_WARNING "dyndbg param is supported only in "
b48420c1d3019c Jim Cromie  2012-04-27  227  			"CONFIG_DYNAMIC_DEBUG builds\n");
b48420c1d3019c Jim Cromie  2012-04-27  228  		return 0; /* allow and ignore */
b48420c1d3019c Jim Cromie  2012-04-27  229  	}
b48420c1d3019c Jim Cromie  2012-04-27 @230  	return -EINVAL;
b48420c1d3019c Jim Cromie  2012-04-27  231  }
b48420c1d3019c Jim Cromie  2012-04-27  232  

:::::: The code at line 224 was first introduced by commit
:::::: b48420c1d3019ce8d84fb8e58f4ca86b8e3655b8 dynamic_debug: make dynamic-debug work for module initialization

:::::: TO: Jim Cromie <jim.cromie@gmail.com>
:::::: CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
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