Re: [PATCH 2/3] vmcore: Convert __read_vmcore to use an iov_iter

From: kernel test robot
Date: Sun Dec 12 2021 - 22:24:44 EST

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In reply to: Matthew Wilcox (Oracle): "[PATCH 2/3] vmcore: Convert __read_vmcore to use an iov_iter"
Next in thread: Christoph Hellwig: "Re: [PATCH 2/3] vmcore: Convert __read_vmcore to use an iov_iter"
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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-vmcore-to-use-an-iov_iter/20211213-080748
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-lkp@xxxxxxxxx/config)
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/687563a8e516282784ed87ca7ed3eca900b42192
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@xxxxxxxxx>

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':
>> fs/proc/vmcore.c:337:17: error: invalid use of undefined type 'struct iov_iter'
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);
| ^~~
>> fs/proc/vmcore.c:347:21: error: implicit declaration of function 'copy_to_iter'; did you mean 'copy_to_user'? [-Werror=implicit-function-declaration]
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
> 337 if (iter->count == 0 || *fpos >= vmcore_size)
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);
> 347 if (copy_to_iter(elfcorebuf + *fpos, tsz, iter) < tsz)
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@xxxxxxxxxxxx

Next message: Sai Prakash Ranjan: "Re: [PATCHv6 0/5] tracing/rwmmio/arm64: Add support to trace register reads/writes"
Previous message: Ming Lei: "Re: Random high CPU utilization in blk-mq with the none scheduler"
In reply to: Matthew Wilcox (Oracle): "[PATCH 2/3] vmcore: Convert __read_vmcore to use an iov_iter"
Next in thread: Christoph Hellwig: "Re: [PATCH 2/3] vmcore: Convert __read_vmcore to use an iov_iter"
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