* [dhowells-fs:iov-kunit 1/6] lib/kunit_iov_iter.c:551:47: warning: performing pointer arithmetic on a null pointer has undefined behavior
@ 2023-11-17 13:30 kernel test robot
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From: kernel test robot @ 2023-11-17 13:30 UTC (permalink / raw)
To: David Howells; +Cc: llvm, oe-kbuild-all
tree: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git iov-kunit
head: 7c85bb8bf31d419e04c93c10cc5348af1f499d77
commit: 9176b1c027c84dd5c718df009dd5ef26317d3094 [1/6] iov_iter: Fix some checkpatch complaints in kunit tests
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20231117/202311172145.ZjpSTmPw-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231117/202311172145.ZjpSTmPw-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311172145.ZjpSTmPw-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from lib/kunit_iov_iter.c:14:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/hexagon/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/hexagon/include/asm/io.h:337:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
547 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
560 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
| ^
In file included from lib/kunit_iov_iter.c:14:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/hexagon/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/hexagon/include/asm/io.h:337:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
573 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
| ^
In file included from lib/kunit_iov_iter.c:14:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/hexagon/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/hexagon/include/asm/io.h:337:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
584 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
594 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
604 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
>> lib/kunit_iov_iter.c:551:47: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
551 | pagelist[i] = (void *)POISON_POINTER_DELTA + 0x5a;
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
lib/kunit_iov_iter.c:629:47: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
629 | pagelist[i] = (void *)POISON_POINTER_DELTA + 0x5a;
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
lib/kunit_iov_iter.c:712:48: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
712 | pagelist[i] = (void *)POISON_POINTER_DELTA + 0x5a;
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
9 warnings generated.
vim +551 lib/kunit_iov_iter.c
521
522 /*
523 * Test the extraction of ITER_KVEC-type iterators.
524 */
525 static void __init iov_kunit_extract_pages_kvec(struct kunit *test)
526 {
527 const struct kvec_test_range *pr;
528 struct iov_iter iter;
529 struct page **bpages, *pagelist[8], **pages = pagelist;
530 struct kvec kvec[8];
531 u8 *buffer;
532 ssize_t len;
533 size_t bufsize, size = 0, npages;
534 int i, from;
535
536 bufsize = 0x100000;
537 npages = bufsize / PAGE_SIZE;
538
539 buffer = iov_kunit_create_buffer(test, &bpages, npages);
540
541 iov_kunit_load_kvec(test, &iter, READ, kvec, ARRAY_SIZE(kvec),
542 buffer, bufsize, kvec_test_ranges);
543 size = iter.count;
544
545 pr = kvec_test_ranges;
546 from = pr->from;
547 do {
548 size_t offset0 = LONG_MAX;
549
550 for (i = 0; i < ARRAY_SIZE(pagelist); i++)
> 551 pagelist[i] = (void *)POISON_POINTER_DELTA + 0x5a;
552
553 len = iov_iter_extract_pages(&iter, &pages, 100 * 1024,
554 ARRAY_SIZE(pagelist), 0, &offset0);
555 KUNIT_EXPECT_GE(test, len, 0);
556 if (len < 0)
557 break;
558 KUNIT_EXPECT_GE(test, (ssize_t)offset0, 0);
559 KUNIT_EXPECT_LT(test, offset0, PAGE_SIZE);
560 KUNIT_EXPECT_LE(test, len, size);
561 KUNIT_EXPECT_EQ(test, iter.count, size - len);
562 size -= len;
563
564 if (len == 0)
565 break;
566
567 for (i = 0; i < ARRAY_SIZE(pagelist); i++) {
568 struct page *p;
569 ssize_t part = min_t(ssize_t, len, PAGE_SIZE - offset0);
570 int ix;
571
572 KUNIT_ASSERT_GE(test, part, 0);
573 while (from == pr->to) {
574 pr++;
575 from = pr->from;
576 if (from < 0)
577 goto stop;
578 }
579 ix = from / PAGE_SIZE;
580 KUNIT_ASSERT_LT(test, ix, npages);
581 p = bpages[ix];
582 KUNIT_EXPECT_PTR_EQ(test, pagelist[i], p);
583 KUNIT_EXPECT_EQ(test, offset0, from % PAGE_SIZE);
584 from += part;
585 len -= part;
586 KUNIT_ASSERT_GE(test, len, 0);
587 if (len == 0)
588 break;
589 offset0 = 0;
590 }
591
592 if (test->status == KUNIT_FAILURE)
593 break;
594 } while (iov_iter_count(&iter) > 0);
595
596 stop:
597 KUNIT_EXPECT_EQ(test, size, 0);
598 KUNIT_EXPECT_EQ(test, iter.count, 0);
599 KUNIT_SUCCEED();
600 }
601
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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