tree: https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux.git hlp_vsie head: c953a69b1dd683366b955620b839b3c2a09b3595 commit: 505c353437dc7d73370468ec77fd159fad9916fb [11/15] s390/mm: Add gmap shadowing for large pmds config: s390-randconfig-r025-20200730 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 6700f4b9fe6321ef704efa4890af5bc351a124f0) 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 s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu git checkout 505c353437dc7d73370468ec77fd159fad9916fb # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> arch/s390/mm/gmap.c:2183:6: warning: no previous prototype for function 'gmap_shadow_pgt_lookup' [-Wmissing-prototypes] void gmap_shadow_pgt_lookup(struct gmap *sg, unsigned long *sge, ^ arch/s390/mm/gmap.c:2183:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void gmap_shadow_pgt_lookup(struct gmap *sg, unsigned long *sge, ^ static 1 warning generated. vim +/gmap_shadow_pgt_lookup +2183 arch/s390/mm/gmap.c 2169 2170 /** 2171 * gmap_shadow_lookup_pgtable - find a shadow page table 2172 * @sg: pointer to the shadow guest address space structure 2173 * @saddr: the address in the shadow guest address space 2174 * @pgt: parent gmap address of the page table to get shadowed 2175 * @dat_protection: if the pgtable is marked as protected by dat 2176 * @fake: pgt references contiguous guest memory block, not a pgtable 2177 * 2178 * Returns 0 if the shadow page table was found and -EAGAIN if the page 2179 * table was not found. 2180 * 2181 * Called with sg->mm->mmap_lock in read. 2182 */ > 2183 void gmap_shadow_pgt_lookup(struct gmap *sg, unsigned long *sge, 2184 unsigned long saddr, unsigned long *pgt, 2185 int *dat_protection, int *fake) 2186 { 2187 struct page *page; 2188 2189 /* Shadow page tables are full pages (pte+pgste) */ 2190 page = pfn_to_page(*sge >> PAGE_SHIFT); 2191 *pgt = page->index & ~GMAP_SHADOW_FAKE_TABLE; 2192 *dat_protection = !!(*sge & _SEGMENT_ENTRY_PROTECT); 2193 *fake = !!(page->index & GMAP_SHADOW_FAKE_TABLE); 2194 } 2195 EXPORT_SYMBOL_GPL(gmap_shadow_pgt_lookup); 2196 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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