Hi Qi, kernel test robot noticed the following build warnings: [auto build test WARNING on brauner-vfs/vfs.all] [also build test WARNING on linus/master v6.5-rc6 next-20230816] [cannot apply to akpm-mm/mm-everything drm-misc/drm-misc-next vfs-idmapping/for-next] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Qi-Zheng/mm-move-some-shrinker-related-function-declarations-to-mm-internal-h/20230816-163833 base: https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs.all patch link: https://lore.kernel.org/r/20230816083419.41088-2-zhengqi.arch%40bytedance.com patch subject: [PATCH 1/5] mm: move some shrinker-related function declarations to mm/internal.h config: riscv-randconfig-r015-20230816 (https://download.01.org/0day-ci/archive/20230816/202308162118.motJd6aG-lkp@xxxxxxxxx/config) compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07) reproduce: (https://download.01.org/0day-ci/archive/20230816/202308162118.motJd6aG-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202308162118.motJd6aG-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): ~~~~~~~~~~ ^ In file included from mm/shrinker_debug.c:7: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:751:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] insw(addr, buffer, count); ^~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:105:53: note: expanded from macro 'insw' #define insw(addr, buffer, count) __insw(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ In file included from mm/shrinker_debug.c:7: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:759:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] insl(addr, buffer, count); ^~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:106:53: note: expanded from macro 'insl' #define insl(addr, buffer, count) __insl(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ In file included from mm/shrinker_debug.c:7: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:768:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outsb(addr, buffer, count); ^~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:118:55: note: expanded from macro 'outsb' #define outsb(addr, buffer, count) __outsb(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ In file included from mm/shrinker_debug.c:7: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:777:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outsw(addr, buffer, count); ^~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:119:55: note: expanded from macro 'outsw' #define outsw(addr, buffer, count) __outsw(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ In file included from mm/shrinker_debug.c:7: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:786:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] outsl(addr, buffer, count); ^~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/io.h:120:55: note: expanded from macro 'outsl' #define outsl(addr, buffer, count) __outsl(PCI_IOBASE + (addr), buffer, count) ~~~~~~~~~~ ^ In file included from mm/shrinker_debug.c:7: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:1134:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; ~~~~~~~~~~ ^ >> mm/shrinker_debug.c:174:5: warning: no previous prototype for function 'shrinker_debugfs_add' [-Wmissing-prototypes] int shrinker_debugfs_add(struct shrinker *shrinker) ^ mm/shrinker_debug.c:174:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int shrinker_debugfs_add(struct shrinker *shrinker) ^ static >> mm/shrinker_debug.c:249:16: warning: no previous prototype for function 'shrinker_debugfs_detach' [-Wmissing-prototypes] struct dentry *shrinker_debugfs_detach(struct shrinker *shrinker, ^ mm/shrinker_debug.c:249:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct dentry *shrinker_debugfs_detach(struct shrinker *shrinker, ^ static >> mm/shrinker_debug.c:265:6: warning: no previous prototype for function 'shrinker_debugfs_remove' [-Wmissing-prototypes] void shrinker_debugfs_remove(struct dentry *debugfs_entry, int debugfs_id) ^ mm/shrinker_debug.c:265:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void shrinker_debugfs_remove(struct dentry *debugfs_entry, int debugfs_id) ^ static 16 warnings generated. vim +/shrinker_debugfs_add +174 mm/shrinker_debug.c bbf535fd6f06b94 Roman Gushchin 2022-05-31 173 5035ebc644aec92 Roman Gushchin 2022-05-31 @174 int shrinker_debugfs_add(struct shrinker *shrinker) 5035ebc644aec92 Roman Gushchin 2022-05-31 175 { 5035ebc644aec92 Roman Gushchin 2022-05-31 176 struct dentry *entry; e33c267ab70de42 Roman Gushchin 2022-05-31 177 char buf[128]; 5035ebc644aec92 Roman Gushchin 2022-05-31 178 int id; 5035ebc644aec92 Roman Gushchin 2022-05-31 179 47a7c01c3efc658 Qi Zheng 2023-06-09 180 lockdep_assert_held(&shrinker_rwsem); 5035ebc644aec92 Roman Gushchin 2022-05-31 181 5035ebc644aec92 Roman Gushchin 2022-05-31 182 /* debugfs isn't initialized yet, add debugfs entries later. */ 5035ebc644aec92 Roman Gushchin 2022-05-31 183 if (!shrinker_debugfs_root) 5035ebc644aec92 Roman Gushchin 2022-05-31 184 return 0; 5035ebc644aec92 Roman Gushchin 2022-05-31 185 5035ebc644aec92 Roman Gushchin 2022-05-31 186 id = ida_alloc(&shrinker_debugfs_ida, GFP_KERNEL); 5035ebc644aec92 Roman Gushchin 2022-05-31 187 if (id < 0) 5035ebc644aec92 Roman Gushchin 2022-05-31 188 return id; 5035ebc644aec92 Roman Gushchin 2022-05-31 189 shrinker->debugfs_id = id; 5035ebc644aec92 Roman Gushchin 2022-05-31 190 e33c267ab70de42 Roman Gushchin 2022-05-31 191 snprintf(buf, sizeof(buf), "%s-%d", shrinker->name, id); 5035ebc644aec92 Roman Gushchin 2022-05-31 192 5035ebc644aec92 Roman Gushchin 2022-05-31 193 /* create debugfs entry */ 5035ebc644aec92 Roman Gushchin 2022-05-31 194 entry = debugfs_create_dir(buf, shrinker_debugfs_root); 5035ebc644aec92 Roman Gushchin 2022-05-31 195 if (IS_ERR(entry)) { 5035ebc644aec92 Roman Gushchin 2022-05-31 196 ida_free(&shrinker_debugfs_ida, id); 5035ebc644aec92 Roman Gushchin 2022-05-31 197 return PTR_ERR(entry); 5035ebc644aec92 Roman Gushchin 2022-05-31 198 } 5035ebc644aec92 Roman Gushchin 2022-05-31 199 shrinker->debugfs_entry = entry; 5035ebc644aec92 Roman Gushchin 2022-05-31 200 2124f79de6a9096 John Keeping 2023-04-18 201 debugfs_create_file("count", 0440, entry, shrinker, 5035ebc644aec92 Roman Gushchin 2022-05-31 202 &shrinker_debugfs_count_fops); 2124f79de6a9096 John Keeping 2023-04-18 203 debugfs_create_file("scan", 0220, entry, shrinker, bbf535fd6f06b94 Roman Gushchin 2022-05-31 204 &shrinker_debugfs_scan_fops); 5035ebc644aec92 Roman Gushchin 2022-05-31 205 return 0; 5035ebc644aec92 Roman Gushchin 2022-05-31 206 } 5035ebc644aec92 Roman Gushchin 2022-05-31 207 e33c267ab70de42 Roman Gushchin 2022-05-31 208 int shrinker_debugfs_rename(struct shrinker *shrinker, const char *fmt, ...) e33c267ab70de42 Roman Gushchin 2022-05-31 209 { e33c267ab70de42 Roman Gushchin 2022-05-31 210 struct dentry *entry; e33c267ab70de42 Roman Gushchin 2022-05-31 211 char buf[128]; e33c267ab70de42 Roman Gushchin 2022-05-31 212 const char *new, *old; e33c267ab70de42 Roman Gushchin 2022-05-31 213 va_list ap; e33c267ab70de42 Roman Gushchin 2022-05-31 214 int ret = 0; e33c267ab70de42 Roman Gushchin 2022-05-31 215 e33c267ab70de42 Roman Gushchin 2022-05-31 216 va_start(ap, fmt); e33c267ab70de42 Roman Gushchin 2022-05-31 217 new = kvasprintf_const(GFP_KERNEL, fmt, ap); e33c267ab70de42 Roman Gushchin 2022-05-31 218 va_end(ap); e33c267ab70de42 Roman Gushchin 2022-05-31 219 e33c267ab70de42 Roman Gushchin 2022-05-31 220 if (!new) e33c267ab70de42 Roman Gushchin 2022-05-31 221 return -ENOMEM; e33c267ab70de42 Roman Gushchin 2022-05-31 222 47a7c01c3efc658 Qi Zheng 2023-06-09 223 down_write(&shrinker_rwsem); e33c267ab70de42 Roman Gushchin 2022-05-31 224 e33c267ab70de42 Roman Gushchin 2022-05-31 225 old = shrinker->name; e33c267ab70de42 Roman Gushchin 2022-05-31 226 shrinker->name = new; e33c267ab70de42 Roman Gushchin 2022-05-31 227 e33c267ab70de42 Roman Gushchin 2022-05-31 228 if (shrinker->debugfs_entry) { e33c267ab70de42 Roman Gushchin 2022-05-31 229 snprintf(buf, sizeof(buf), "%s-%d", shrinker->name, e33c267ab70de42 Roman Gushchin 2022-05-31 230 shrinker->debugfs_id); e33c267ab70de42 Roman Gushchin 2022-05-31 231 e33c267ab70de42 Roman Gushchin 2022-05-31 232 entry = debugfs_rename(shrinker_debugfs_root, e33c267ab70de42 Roman Gushchin 2022-05-31 233 shrinker->debugfs_entry, e33c267ab70de42 Roman Gushchin 2022-05-31 234 shrinker_debugfs_root, buf); e33c267ab70de42 Roman Gushchin 2022-05-31 235 if (IS_ERR(entry)) e33c267ab70de42 Roman Gushchin 2022-05-31 236 ret = PTR_ERR(entry); e33c267ab70de42 Roman Gushchin 2022-05-31 237 else e33c267ab70de42 Roman Gushchin 2022-05-31 238 shrinker->debugfs_entry = entry; e33c267ab70de42 Roman Gushchin 2022-05-31 239 } e33c267ab70de42 Roman Gushchin 2022-05-31 240 47a7c01c3efc658 Qi Zheng 2023-06-09 241 up_write(&shrinker_rwsem); e33c267ab70de42 Roman Gushchin 2022-05-31 242 e33c267ab70de42 Roman Gushchin 2022-05-31 243 kfree_const(old); e33c267ab70de42 Roman Gushchin 2022-05-31 244 e33c267ab70de42 Roman Gushchin 2022-05-31 245 return ret; e33c267ab70de42 Roman Gushchin 2022-05-31 246 } e33c267ab70de42 Roman Gushchin 2022-05-31 247 EXPORT_SYMBOL(shrinker_debugfs_rename); e33c267ab70de42 Roman Gushchin 2022-05-31 248 26e239b37ebdfd1 Joan Bruguera Micó 2023-05-03 @249 struct dentry *shrinker_debugfs_detach(struct shrinker *shrinker, 26e239b37ebdfd1 Joan Bruguera Micó 2023-05-03 250 int *debugfs_id) 5035ebc644aec92 Roman Gushchin 2022-05-31 251 { badc28d4924bfed Qi Zheng 2023-02-02 252 struct dentry *entry = shrinker->debugfs_entry; badc28d4924bfed Qi Zheng 2023-02-02 253 47a7c01c3efc658 Qi Zheng 2023-06-09 254 lockdep_assert_held(&shrinker_rwsem); 5035ebc644aec92 Roman Gushchin 2022-05-31 255 e33c267ab70de42 Roman Gushchin 2022-05-31 256 kfree_const(shrinker->name); 14773bfa70e67f4 Tetsuo Handa 2022-07-20 257 shrinker->name = NULL; e33c267ab70de42 Roman Gushchin 2022-05-31 258 26e239b37ebdfd1 Joan Bruguera Micó 2023-05-03 259 *debugfs_id = entry ? shrinker->debugfs_id : -1; badc28d4924bfed Qi Zheng 2023-02-02 260 shrinker->debugfs_entry = NULL; badc28d4924bfed Qi Zheng 2023-02-02 261 badc28d4924bfed Qi Zheng 2023-02-02 262 return entry; 5035ebc644aec92 Roman Gushchin 2022-05-31 263 } 5035ebc644aec92 Roman Gushchin 2022-05-31 264 26e239b37ebdfd1 Joan Bruguera Micó 2023-05-03 @265 void shrinker_debugfs_remove(struct dentry *debugfs_entry, int debugfs_id) 26e239b37ebdfd1 Joan Bruguera Micó 2023-05-03 266 { 26e239b37ebdfd1 Joan Bruguera Micó 2023-05-03 267 debugfs_remove_recursive(debugfs_entry); 26e239b37ebdfd1 Joan Bruguera Micó 2023-05-03 268 ida_free(&shrinker_debugfs_ida, debugfs_id); 26e239b37ebdfd1 Joan Bruguera Micó 2023-05-03 269 } 26e239b37ebdfd1 Joan Bruguera Micó 2023-05-03 270 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
