Hi "Matthew, Thank you for the patch! Yet something to improve: [auto build test ERROR on tip/x86/core] [also build test ERROR on arm64/for-next/core powerpc/next s390/features linus/master v5.16-rc5] [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] url: https://github.com/0day-ci/linux/commits/Matthew-Wilcox-Oracle/Convert-vm... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git e463a09af2f0677b9485a7e8e4e70b396b2ffb6f config: riscv-randconfig-r012-20211213 (https://download.01.org/0day-ci/archive/20211213/202112131103.3ExA0BMN-lk...) compiler: riscv64-linux-gcc (GCC) 11.2.0 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 # https://github.com/0day-ci/linux/commit/687563a8e516282784ed87ca7ed3eca90... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Matthew-Wilcox-Oracle/Convert-vmcore-to-use-an-iov_iter/20211213-080748 git checkout 687563a8e516282784ed87ca7ed3eca900b42192 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=riscv SHELL=/bin/bash fs/proc/ 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 >>): fs/proc/vmcore.c:135:9: warning: no previous prototype for 'read_from_oldmem_iter' [-Wmissing-prototypes] 135 | ssize_t read_from_oldmem_iter(struct iov_iter *iter, size_t count, | ^~~~~~~~~~~~~~~~~~~~~ fs/proc/vmcore.c: In function 'read_from_oldmem_iter': fs/proc/vmcore.c:157:31: error: implicit declaration of function 'iov_iter_zero' [-Werror=implicit-function-declaration] 157 | tmp = iov_iter_zero(nr_bytes, iter); | ^~~~~~~~~~~~~ fs/proc/vmcore.c: In function 'read_from_oldmem': fs/proc/vmcore.c:187:25: error: storage size of 'iter' isn't known 187 | struct iov_iter iter; | ^~~~ fs/proc/vmcore.c:188:22: error: storage size of 'iov' isn't known 188 | struct iovec iov; | ^~~ fs/proc/vmcore.c:189:21: error: storage size of 'kvec' isn't known 189 | struct kvec kvec; | ^~~~ fs/proc/vmcore.c:194:17: error: implicit declaration of function 'iov_iter_init'; did you mean 'klist_iter_init'? [-Werror=implicit-function-declaration] 194 | iov_iter_init(&iter, READ, &iov, 1, count); | ^~~~~~~~~~~~~ | klist_iter_init fs/proc/vmcore.c:198:17: error: implicit declaration of function 'iov_iter_kvec' [-Werror=implicit-function-declaration] 198 | iov_iter_kvec(&iter, READ, &kvec, 1, count); | ^~~~~~~~~~~~~ fs/proc/vmcore.c:189:21: warning: unused variable 'kvec' [-Wunused-variable] 189 | struct kvec kvec; | ^~~~ fs/proc/vmcore.c:188:22: warning: unused variable 'iov' [-Wunused-variable] 188 | struct iovec iov; | ^~~ fs/proc/vmcore.c:187:25: warning: unused variable 'iter' [-Wunused-variable] 187 | struct iov_iter iter; | ^~~~ fs/proc/vmcore.c: In function '__read_vmcore': 337 | if (iter->count == 0 || *fpos >= vmcore_size) | ^~ fs/proc/vmcore.c:341:17: error: invalid use of undefined type 'struct iov_iter' 341 | if (iter->count > vmcore_size - *fpos) | ^~ fs/proc/vmcore.c:342:21: error: invalid use of undefined type 'struct iov_iter' 342 | iter->count = vmcore_size - *fpos; | ^~ In file included from include/linux/kernel.h:17, from include/linux/cpumask.h:10, from include/linux/smp.h:13, from include/linux/lockdep.h:14, from include/linux/spinlock.h:62, from include/linux/mmzone.h:8, from include/linux/gfp.h:6, from include/linux/mm.h:10, from fs/proc/vmcore.c:11: fs/proc/vmcore.c:346:62: error: invalid use of undefined type 'struct iov_iter' 346 | tsz = min(elfcorebuf_sz - (size_t)*fpos, iter->count); | ^~ include/linux/minmax.h:20:46: note: in definition of macro '__typecheck' 20 | (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1))) | ^ include/linux/minmax.h:36:31: note: in expansion of macro '__safe_cmp' 36 | __builtin_choose_expr(__safe_cmp(x, y), \ | ^~~~~~~~~~ include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp' 45 | #define min(x, y) __careful_cmp(x, y, <) | ^~~~~~~~~~~~~ fs/proc/vmcore.c:346:23: note: in expansion of macro 'min' 346 | tsz = min(elfcorebuf_sz - (size_t)*fpos, iter->count); | ^~~ In file included from arch/riscv/include/asm/bug.h:10, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/mm.h:9, from fs/proc/vmcore.c:11: fs/proc/vmcore.c:346:62: error: invalid use of undefined type 'struct iov_iter' 346 | tsz = min(elfcorebuf_sz - (size_t)*fpos, iter->count); | ^~ include/linux/const.h:12:55: note: in definition of macro '__is_constexpr' 12 | (sizeof(int) == sizeof(*(8 ? ((void *)((long)(x) * 0l)) : (int *)8))) | ^ include/linux/minmax.h:26:39: note: in expansion of macro '__no_side_effects' 26 | (__typecheck(x, y) && __no_side_effects(x, y)) | ^~~~~~~~~~~~~~~~~ include/linux/minmax.h:36:31: note: in expansion of macro '__safe_cmp' 36 | __builtin_choose_expr(__safe_cmp(x, y), \ | ^~~~~~~~~~ include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp' 45 | #define min(x, y) __careful_cmp(x, y, <) | ^~~~~~~~~~~~~ fs/proc/vmcore.c:346:23: note: in expansion of macro 'min' 346 | tsz = min(elfcorebuf_sz - (size_t)*fpos, iter->count); | ^~~ In file included from include/linux/kernel.h:17, from include/linux/cpumask.h:10, from include/linux/smp.h:13, from include/linux/lockdep.h:14, from include/linux/spinlock.h:62, from include/linux/mmzone.h:8, from include/linux/gfp.h:6, from include/linux/mm.h:10, from fs/proc/vmcore.c:11: fs/proc/vmcore.c:346:62: error: invalid use of undefined type 'struct iov_iter' 346 | tsz = min(elfcorebuf_sz - (size_t)*fpos, iter->count); | ^~ include/linux/minmax.h:28:34: note: in definition of macro '__cmp' 28 | #define __cmp(x, y, op) ((x) op (y) ? (x) : (y)) | ^ include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp' 45 | #define min(x, y) __careful_cmp(x, y, <) | ^~~~~~~~~~~~~ fs/proc/vmcore.c:346:23: note: in expansion of macro 'min' 346 | tsz = min(elfcorebuf_sz - (size_t)*fpos, iter->count); | ^~~ fs/proc/vmcore.c:346:62: error: invalid use of undefined type 'struct iov_iter' 346 | tsz = min(elfcorebuf_sz - (size_t)*fpos, iter->count); | ^~ include/linux/minmax.h:28:46: note: in definition of macro '__cmp' 28 | #define __cmp(x, y, op) ((x) op (y) ? (x) : (y)) | ^ include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp' 45 | #define min(x, y) __careful_cmp(x, y, <) | ^~~~~~~~~~~~~ fs/proc/vmcore.c:346:23: note: in expansion of macro 'min' 346 | tsz = min(elfcorebuf_sz - (size_t)*fpos, iter->count); | ^~~ fs/proc/vmcore.c:346:62: error: invalid use of undefined type 'struct iov_iter' 346 | tsz = min(elfcorebuf_sz - (size_t)*fpos, iter->count); | ^~ include/linux/minmax.h:32:24: note: in definition of macro '__cmp_once' 32 | typeof(y) unique_y = (y); \ | ^ include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp' 45 | #define min(x, y) __careful_cmp(x, y, <) | ^~~~~~~~~~~~~ fs/proc/vmcore.c:346:23: note: in expansion of macro 'min' 346 | tsz = min(elfcorebuf_sz - (size_t)*fpos, iter->count); | ^~~ fs/proc/vmcore.c:346:62: error: invalid use of undefined type 'struct iov_iter' 346 | tsz = min(elfcorebuf_sz - (size_t)*fpos, iter->count); | ^~ include/linux/minmax.h:32:39: note: in definition of macro '__cmp_once' 32 | typeof(y) unique_y = (y); \ | ^ include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp' 45 | #define min(x, y) __careful_cmp(x, y, <) | ^~~~~~~~~~~~~ fs/proc/vmcore.c:346:23: note: in expansion of macro 'min' 346 | tsz = min(elfcorebuf_sz - (size_t)*fpos, iter->count); | ^~~ include/linux/minmax.h:36:9: error: first argument to '__builtin_choose_expr' not a constant 36 | __builtin_choose_expr(__safe_cmp(x, y), \ | ^~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp' 45 | #define min(x, y) __careful_cmp(x, y, <) | ^~~~~~~~~~~~~ fs/proc/vmcore.c:346:23: note: in expansion of macro 'min' 346 | tsz = min(elfcorebuf_sz - (size_t)*fpos, iter->count); | ^~~ 347 | if (copy_to_iter(elfcorebuf + *fpos, tsz, iter) < tsz) | ^~~~~~~~~~~~ | copy_to_user fs/proc/vmcore.c:353:25: error: invalid use of undefined type 'struct iov_iter' 353 | if (iter->count == 0) | ^~ In file included from include/linux/kernel.h:17, from include/linux/cpumask.h:10, from include/linux/smp.h:13, from include/linux/lockdep.h:14, from include/linux/spinlock.h:62, from include/linux/mmzone.h:8, from include/linux/gfp.h:6, from include/linux/mm.h:10, from fs/proc/vmcore.c:11: fs/proc/vmcore.c:389:76: error: invalid use of undefined type 'struct iov_iter' 389 | tsz = min(elfcorebuf_sz + elfnotes_sz - (size_t)*fpos, iter->count); | ^~ include/linux/minmax.h:20:46: note: in definition of macro '__typecheck' 20 | (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1))) | ^ include/linux/minmax.h:36:31: note: in expansion of macro '__safe_cmp' 36 | __builtin_choose_expr(__safe_cmp(x, y), \ | ^~~~~~~~~~ include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp' 45 | #define min(x, y) __careful_cmp(x, y, <) | ^~~~~~~~~~~~~ fs/proc/vmcore.c:389:23: note: in expansion of macro 'min' 389 | tsz = min(elfcorebuf_sz + elfnotes_sz - (size_t)*fpos, iter->count); | ^~~ In file included from arch/riscv/include/asm/bug.h:10, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/mm.h:9, from fs/proc/vmcore.c:11: fs/proc/vmcore.c:389:76: error: invalid use of undefined type 'struct iov_iter' 389 | tsz = min(elfcorebuf_sz + elfnotes_sz - (size_t)*fpos, iter->count); | ^~ include/linux/const.h:12:55: note: in definition of macro '__is_constexpr' 12 | (sizeof(int) == sizeof(*(8 ? ((void *)((long)(x) * 0l)) : (int *)8))) | ^ include/linux/minmax.h:26:39: note: in expansion of macro '__no_side_effects' 26 | (__typecheck(x, y) && __no_side_effects(x, y)) | ^~~~~~~~~~~~~~~~~ include/linux/minmax.h:36:31: note: in expansion of macro '__safe_cmp' 36 | __builtin_choose_expr(__safe_cmp(x, y), \ | ^~~~~~~~~~ include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp' 45 | #define min(x, y) __careful_cmp(x, y, <) | ^~~~~~~~~~~~~ fs/proc/vmcore.c:389:23: note: in expansion of macro 'min' 389 | tsz = min(elfcorebuf_sz + elfnotes_sz - (size_t)*fpos, iter->count); | ^~~ In file included from include/linux/kernel.h:17, from include/linux/cpumask.h:10, from include/linux/smp.h:13, from include/linux/lockdep.h:14, from include/linux/spinlock.h:62, from include/linux/mmzone.h:8, from include/linux/gfp.h:6, from include/linux/mm.h:10, from fs/proc/vmcore.c:11: fs/proc/vmcore.c:389:76: error: invalid use of undefined type 'struct iov_iter' 389 | tsz = min(elfcorebuf_sz + elfnotes_sz - (size_t)*fpos, iter->count); | ^~ include/linux/minmax.h:28:34: note: in definition of macro '__cmp' 28 | #define __cmp(x, y, op) ((x) op (y) ? (x) : (y)) | ^ include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp' 45 | #define min(x, y) __careful_cmp(x, y, <) | ^~~~~~~~~~~~~ fs/proc/vmcore.c:389:23: note: in expansion of macro 'min' 389 | tsz = min(elfcorebuf_sz + elfnotes_sz - (size_t)*fpos, iter->count); | ^~~ fs/proc/vmcore.c:389:76: error: invalid use of undefined type 'struct iov_iter' 389 | tsz = min(elfcorebuf_sz + elfnotes_sz - (size_t)*fpos, iter->count); | ^~ include/linux/minmax.h:28:46: note: in definition of macro '__cmp' 28 | #define __cmp(x, y, op) ((x) op (y) ? (x) : (y)) | ^ include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp' 45 | #define min(x, y) __careful_cmp(x, y, <) | ^~~~~~~~~~~~~ fs/proc/vmcore.c:389:23: note: in expansion of macro 'min' 389 | tsz = min(elfcorebuf_sz + elfnotes_sz - (size_t)*fpos, iter->count); | ^~~ fs/proc/vmcore.c:389:76: error: invalid use of undefined type 'struct iov_iter' 389 | tsz = min(elfcorebuf_sz + elfnotes_sz - (size_t)*fpos, iter->count); | ^~ include/linux/minmax.h:32:24: note: in definition of macro '__cmp_once' 32 | typeof(y) unique_y = (y); \ | ^ include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp' 45 | #define min(x, y) __careful_cmp(x, y, <) | ^~~~~~~~~~~~~ fs/proc/vmcore.c:389:23: note: in expansion of macro 'min' 389 | tsz = min(elfcorebuf_sz + elfnotes_sz - (size_t)*fpos, iter->count); | ^~~ fs/proc/vmcore.c:389:76: error: invalid use of undefined type 'struct iov_iter' 389 | tsz = min(elfcorebuf_sz + elfnotes_sz - (size_t)*fpos, iter->count); vim +337 fs/proc/vmcore.c 326 327 /* Read from the ELF header and then the crash dump. On error, negative value is 328 * returned otherwise number of bytes read are returned. 329 */ 330 static ssize_t __read_vmcore(struct iov_iter *iter, loff_t *fpos) 331 { 332 ssize_t acc = 0, tmp; 333 size_t tsz; 334 u64 start; 335 struct vmcore *m = NULL; 336 338 return 0; 339 340 /* trim iter to not go beyond EOF */ 341 if (iter->count > vmcore_size - *fpos) 342 iter->count = vmcore_size - *fpos; 343 344 /* Read ELF core header */ 345 if (*fpos < elfcorebuf_sz) { 346 tsz = min(elfcorebuf_sz - (size_t)*fpos, iter->count); 348 return -EFAULT; 349 *fpos += tsz; 350 acc += tsz; 351 352 /* leave now if filled buffer already */ 353 if (iter->count == 0) 354 return acc; 355 } 356 357 /* Read Elf note segment */ 358 if (*fpos < elfcorebuf_sz + elfnotes_sz) { 359 void *kaddr; 360 361 /* We add device dumps before other elf notes because the 362 * other elf notes may not fill the elf notes buffer 363 * completely and we will end up with zero-filled data 364 * between the elf notes and the device dumps. Tools will 365 * then try to decode this zero-filled data as valid notes 366 * and we don't want that. Hence, adding device dumps before 367 * the other elf notes ensure that zero-filled data can be 368 * avoided. 369 */ 370 #ifdef CONFIG_PROC_VMCORE_DEVICE_DUMP 371 /* Read device dumps */ 372 if (*fpos < elfcorebuf_sz + vmcoredd_orig_sz) { 373 tsz = min(elfcorebuf_sz + vmcoredd_orig_sz - 374 (size_t)*fpos, iter->count); 375 start = *fpos - elfcorebuf_sz; 376 if (vmcoredd_copy_dumps(iter, start, tsz)) 377 return -EFAULT; 378 379 *fpos += tsz; 380 acc += tsz; 381 382 /* leave now if filled buffer already */ 383 if (!iter->count) 384 return acc; 385 } 386 #endif /* CONFIG_PROC_VMCORE_DEVICE_DUMP */ 387 388 /* Read remaining elf notes */ 389 tsz = min(elfcorebuf_sz + elfnotes_sz - (size_t)*fpos, iter->count); 390 kaddr = elfnotes_buf + *fpos - elfcorebuf_sz - vmcoredd_orig_sz; 391 if (copy_to_iter(kaddr, tsz, iter) < tsz) 392 return -EFAULT; 393 394 *fpos += tsz; 395 acc += tsz; 396 397 /* leave now if filled buffer already */ 398 if (iter->count == 0) 399 return acc; 400 } 401 402 list_for_each_entry(m, &vmcore_list, list) { 403 if (*fpos < m->offset + m->size) { 404 tsz = (size_t)min_t(unsigned long long, 405 m->offset + m->size - *fpos, 406 iter->count); 407 start = m->paddr + *fpos - m->offset; 408 tmp = read_from_oldmem_iter(iter, tsz, &start, 409 cc_platform_has(CC_ATTR_MEM_ENCRYPT)); 410 if (tmp < 0) 411 return tmp; 412 *fpos += tsz; 413 acc += tsz; 414 415 /* leave now if filled buffer already */ 416 if (iter->count == 0) 417 return acc; 418 } 419 } 420 421 return acc; 422 } 423 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org