tree: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git for-5.9 head: d5ff5fb977f0c3d07bdb9f87b490c70481c8666f commit: da6690767cbd344998f36081815c85f3d467e78c [11/30] regulator: consumer: Supply missing prototypes for 3 core functions config: s390-allyesconfig (attached as .config) compiler: s390-linux-gcc (GCC) 9.3.0 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 git checkout da6690767cbd344998f36081815c85f3d467e78c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from ./arch/s390/include/generated/asm/cacheflush.h:1, from drivers/media/platform/omap3isp/isp.c:42: include/asm-generic/cacheflush.h:16:42: warning: 'struct mm_struct' declared inside parameter list will not be visible outside of this definition or declaration 16 | static inline void flush_cache_mm(struct mm_struct *mm) | ^~~~~~~~~ include/asm-generic/cacheflush.h:22:46: warning: 'struct mm_struct' declared inside parameter list will not be visible outside of this definition or declaration 22 | static inline void flush_cache_dup_mm(struct mm_struct *mm) | ^~~~~~~~~ include/asm-generic/cacheflush.h:28:45: warning: 'struct vm_area_struct' declared inside parameter list will not be visible outside of this definition or declaration 28 | static inline void flush_cache_range(struct vm_area_struct *vma, | ^~~~~~~~~~~~~~ include/asm-generic/cacheflush.h:36:44: warning: 'struct vm_area_struct' declared inside parameter list will not be visible outside of this definition or declaration 36 | static inline void flush_cache_page(struct vm_area_struct *vma, | ^~~~~~~~~~~~~~ include/asm-generic/cacheflush.h:44:45: warning: 'struct page' declared inside parameter list will not be visible outside of this definition or declaration 44 | static inline void flush_dcache_page(struct page *page) | ^~~~ include/asm-generic/cacheflush.h:52:50: warning: 'struct address_space' declared inside parameter list will not be visible outside of this definition or declaration 52 | static inline void flush_dcache_mmap_lock(struct address_space *mapping) | ^~~~~~~~~~~~~ include/asm-generic/cacheflush.h:58:52: warning: 'struct address_space' declared inside parameter list will not be visible outside of this definition or declaration 58 | static inline void flush_dcache_mmap_unlock(struct address_space *mapping) | ^~~~~~~~~~~~~ include/asm-generic/cacheflush.h:75:17: warning: 'struct page' declared inside parameter list will not be visible outside of this definition or declaration 75 | struct page *page) | ^~~~ include/asm-generic/cacheflush.h:74:45: warning: 'struct vm_area_struct' declared inside parameter list will not be visible outside of this definition or declaration 74 | static inline void flush_icache_page(struct vm_area_struct *vma, | ^~~~~~~~~~~~~~ include/asm-generic/cacheflush.h:82:16: warning: 'struct page' declared inside parameter list will not be visible outside of this definition or declaration 82 | struct page *page, | ^~~~ include/asm-generic/cacheflush.h:81:50: warning: 'struct vm_area_struct' declared inside parameter list will not be visible outside of this definition or declaration 81 | static inline void flush_icache_user_page(struct vm_area_struct *vma, | ^~~~~~~~~~~~~~ In file included from include/linux/pagemap.h:11, from include/linux/blkdev.h:16, from include/linux/blk-cgroup.h:23, from include/linux/writeback.h:14, from include/linux/memcontrol.h:22, from include/linux/swap.h:9, from include/linux/suspend.h:5, from include/linux/regulator/consumer.h:35, from drivers/media/platform/omap3isp/isp.c:56: include/linux/highmem.h: In function 'zero_user_segments': 302 | flush_dcache_page(page); | ^~~~ | | | struct page * In file included from ./arch/s390/include/generated/asm/cacheflush.h:1, from drivers/media/platform/omap3isp/isp.c:42: include/asm-generic/cacheflush.h:44:51: note: expected 'struct page *' but argument is of type 'struct page *' 44 | static inline void flush_dcache_page(struct page *page) | ~~~~~~~~~~~~~^~~~ cc1: some warnings being treated as errors vim +/flush_dcache_page +302 include/linux/highmem.h ^1da177e4c3f41 Linus Torvalds 2005-04-16 286 eebd2aa355692a Christoph Lameter 2008-02-04 287 static inline void zero_user_segments(struct page *page, eebd2aa355692a Christoph Lameter 2008-02-04 288 unsigned start1, unsigned end1, eebd2aa355692a Christoph Lameter 2008-02-04 289 unsigned start2, unsigned end2) eebd2aa355692a Christoph Lameter 2008-02-04 290 { 1ec9c5ddc17aa3 Cong Wang 2011-11-25 291 void *kaddr = kmap_atomic(page); eebd2aa355692a Christoph Lameter 2008-02-04 292 eebd2aa355692a Christoph Lameter 2008-02-04 293 BUG_ON(end1 > PAGE_SIZE || end2 > PAGE_SIZE); eebd2aa355692a Christoph Lameter 2008-02-04 294 eebd2aa355692a Christoph Lameter 2008-02-04 295 if (end1 > start1) eebd2aa355692a Christoph Lameter 2008-02-04 296 memset(kaddr + start1, 0, end1 - start1); eebd2aa355692a Christoph Lameter 2008-02-04 297 eebd2aa355692a Christoph Lameter 2008-02-04 298 if (end2 > start2) eebd2aa355692a Christoph Lameter 2008-02-04 299 memset(kaddr + start2, 0, end2 - start2); eebd2aa355692a Christoph Lameter 2008-02-04 300 1ec9c5ddc17aa3 Cong Wang 2011-11-25 301 kunmap_atomic(kaddr); eebd2aa355692a Christoph Lameter 2008-02-04 @302 flush_dcache_page(page); eebd2aa355692a Christoph Lameter 2008-02-04 303 } eebd2aa355692a Christoph Lameter 2008-02-04 304 :::::: The code at line 302 was first introduced by commit :::::: eebd2aa355692afaf9906f62118620f1a1c19dbb Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user :::::: TO: Christoph Lameter <clameter(a)sgi.com&gt; :::::: CC: Linus Torvalds <torvalds(a)woody.linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org