* [hch-block:drbd-blk-limits 5/16] drivers/md/raid0.c:396:7: warning: variable 'conf' is uninitialized when used here
@ 2024-02-25 17:19 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2024-02-25 17:19 UTC (permalink / raw)
To: Christoph Hellwig; +Cc: oe-kbuild-all
tree: git://git.infradead.org/users/hch/block.git drbd-blk-limits
head: 952f67c787298e616a8aa5acc3f881d267e6c7b5
commit: c3361ed114ad32d50e622fdf1e3f27d4a1dde8fb [5/16] md/raid0: use the atomic queue limit update APIs
config: s390-defconfig (https://download.01.org/0day-ci/archive/20240226/202402260107.fb5L5XSm-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project edd4aee4dd9b5b98b2576a6f783e4086173d902a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240226/202402260107.fb5L5XSm-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/202402260107.fb5L5XSm-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from drivers/md/raid0.c:17:
In file included from include/trace/events/block.h:8:
In file included from include/linux/blktrace_api.h:5:
In file included from include/linux/blk-mq.h:8:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:78:
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/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
| ^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
102 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
| ^
In file included from drivers/md/raid0.c:17:
In file included from include/trace/events/block.h:8:
In file included from include/linux/blktrace_api.h:5:
In file included from include/linux/blk-mq.h:8:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:78:
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/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
| ^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
115 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
| ^
In file included from drivers/md/raid0.c:17:
In file included from include/trace/events/block.h:8:
In file included from include/linux/blktrace_api.h:5:
In file included from include/linux/blk-mq.h:8:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:78:
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);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
692 | readsb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
700 | readsw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
708 | readsl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
717 | writesb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
726 | writesw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
735 | writesl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
>> drivers/md/raid0.c:396:7: warning: variable 'conf' is uninitialized when used here [-Wuninitialized]
396 | if (!conf) {
| ^~~~
drivers/md/raid0.c:385:21: note: initialize the variable 'conf' to silence this warning
385 | struct r0conf *conf;
| ^
| = NULL
13 warnings generated.
vim +/conf +396 drivers/md/raid0.c
381
382 static int raid0_run(struct mddev *mddev)
383 {
384 struct queue_limits lim;
385 struct r0conf *conf;
386 int ret;
387
388 if (mddev->chunk_sectors == 0) {
389 pr_warn("md/raid0:%s: chunk size must be set.\n", mdname(mddev));
390 return -EINVAL;
391 }
392 if (md_check_no_bitmap(mddev))
393 return -EINVAL;
394
395 /* if conf is not null, we are here after takeover */
> 396 if (!conf) {
397 ret = create_strip_zones(mddev, &conf);
398 if (ret < 0)
399 return ret;
400 mddev->private = conf;
401 }
402
403 blk_set_stacking_limits(&lim);
404 lim.max_hw_sectors = mddev->chunk_sectors;
405 lim.max_write_zeroes_sectors = mddev->chunk_sectors;
406 lim.io_min = mddev->chunk_sectors << 9;
407 lim.io_opt = lim.io_min * mddev->raid_disks;
408 mddev_stack_rdev_limits(mddev, &lim);
409 ret = queue_limits_set(mddev->queue, &lim);
410 if (ret)
411 goto out_free_conf;
412
413 /* calculate array device size */
414 md_set_array_sectors(mddev, raid0_size(mddev, 0, 0));
415
416 pr_debug("md/raid0:%s: md_size is %llu sectors.\n",
417 mdname(mddev),
418 (unsigned long long)mddev->array_sectors);
419
420 dump_zones(mddev);
421
422 ret = md_integrity_register(mddev);
423 if (ret)
424 goto out_free_conf;
425 return 0;
426 out_free_conf:
427 free_conf(mddev, conf);
428 return ret;
429 }
430
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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2024-02-25 17:19 [hch-block:drbd-blk-limits 5/16] drivers/md/raid0.c:396:7: warning: variable 'conf' is uninitialized when used here kernel test robot
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