tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 0c947b893d69231a9add855939da7c66237ab44f commit: 50f53fb721817a6efa541cca24f1b7caa84801c1 arm64: trans_pgd: make trans_pgd_map_page generic date: 12 months ago config: arm64-randconfig-s031-20220117 (https://download.01.org/0day-ci/archive/20220118/202201181248.rDauB3ns-lk...) compiler: aarch64-linux-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 50f53fb721817a6efa541cca24f1b7caa84801c1 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/kernel/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) arch/arm64/kernel/hibernate.c:181:39: sparse: sparse: cast to restricted gfp_t vim +202 arch/arm64/kernel/hibernate.c 183 184 /* 185 * Copies length bytes, starting at src_start into an new page, 186 * perform cache maintenance, then maps it at the specified address low 187 * address as executable. 188 * 189 * This is used by hibernate to copy the code it needs to execute when 190 * overwriting the kernel text. This function generates a new set of page 191 * tables, which it loads into ttbr0. 192 * 193 * Length is provided as we probably only want 4K of data, even on a 64K 194 * page system. 195 */ 196 static int create_safe_exec_page(void *src_start, size_t length, 197 unsigned long dst_addr, 198 phys_addr_t *phys_dst_addr) 199 { 200 struct trans_pgd_info trans_info = { 201 .trans_alloc_page = hibernate_page_alloc, 203 }; 204 205 void *page = (void *)get_safe_page(GFP_ATOMIC); 206 pgd_t *trans_pgd; 207 int rc; 208 209 if (!page) 210 return -ENOMEM; 211 212 memcpy(page, src_start, length); 213 __flush_icache_range((unsigned long)page, (unsigned long)page + length); 214 215 trans_pgd = (void *)get_safe_page(GFP_ATOMIC); 216 if (!trans_pgd) 217 return -ENOMEM; 218 219 rc = trans_pgd_map_page(&trans_info, trans_pgd, page, dst_addr, 220 PAGE_KERNEL_EXEC); 221 if (rc) 222 return rc; 223 224 /* 225 * Load our new page tables. A strict BBM approach requires that we 226 * ensure that TLBs are free of any entries that may overlap with the 227 * global mappings we are about to install. 228 * 229 * For a real hibernate/resume cycle TTBR0 currently points to a zero 230 * page, but TLBs may contain stale ASID-tagged entries (e.g. for EFI 231 * runtime services), while for a userspace-driven test_resume cycle it 232 * points to userspace page tables (and we must point it at a zero page 233 * ourselves). Elsewhere we only (un)install the idmap with preemption 234 * disabled, so T0SZ should be as required regardless. 235 */ 236 cpu_set_reserved_ttbr0(); 237 local_flush_tlb_all(); 238 write_sysreg(phys_to_ttbr(virt_to_phys(trans_pgd)), ttbr0_el1); 239 isb(); 240 241 *phys_dst_addr = virt_to_phys(page); 242 243 return 0; 244 } 245 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org