tree:   https://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux.git dsa_page_zero_prototype
head:   443bff56d346197a2f8c09c7159ebc9e7440429b
commit: ec41aa6ef6cba25e349a04e3b4cc1e37217d54f6 [31/39] mm/pagezero: Add stub driver to test registration API
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux.git/commit/?id=ec41aa6ef6cba25e349a04e3b4cc1e37217d54f6
        git remote add aegl https://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux.git
        git fetch --no-tags aegl dsa_page_zero_prototype
        git checkout ec41aa6ef6cba25e349a04e3b4cc1e37217d54f6
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

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

All errors (new ones prefixed by >>):

>> drivers/dma/idxd/dsa_page_clear_engine.c:29:5: error: no previous prototype for 'get_clear_pages' [-Werror=missing-prototypes]
      29 | int get_clear_pages(void *v, int migratetype, int want, struct list_head *l, int *countp)
         |     ^~~~~~~~~~~~~~~
>> drivers/dma/idxd/dsa_page_clear_engine.c:35:6: error: no previous prototype for 'add_new_page' [-Werror=missing-prototypes]
      35 | void add_new_page(void *v, struct page *page)
         |      ^~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +/get_clear_pages +29 drivers/dma/idxd/dsa_page_clear_engine.c

    27	
    28	/* Called with zone->lock held */
  > 29	int get_clear_pages(void *v, int migratetype, int want, struct list_head *l, int *countp)
    30	{
    31		return 0;
    32	}
    33	
    34	/* Called with zone->lock held */
  > 35	void add_new_page(void *v, struct page *page)
    36	{
    37	}
    38	

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