Re: [PATCH v2 3/3] mctp: Add MCTP-over-KCS transport binding

[Konstantin Aladyshev]

Oops, sorry about that.
I've introduced this new warning when I've refactored my code to use
'dev_err_probe'.
I've sent the v3 series to correct the issue, I hope now everything is clear.
I haven't figured out how to run clang in my yocto environment where I
develop code, but the
```
make W=1 C=1 drivers/net/mctp/mctp-kcs.o
```
runs without any issues now.

Best regards,
Konstantin Aladyshev

On Tue, Oct 3, 2023 at 2:05 AM kernel test robot <lkp@xxxxxxxxx> wrote:
>
> Hi Konstantin,
>
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on cminyard-ipmi/for-next]
> [also build test WARNING on linus/master v6.6-rc4 next-20230929]
> [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/Konstantin-Aladyshev/ipmi-Move-KCS-headers-to-common-include-folder/20231002-223632
> base:   https://github.com/cminyard/linux-ipmi for-next
> patch link:    https://lore.kernel.org/r/20231002143441.545-4-aladyshev22%40gmail.com
> patch subject: [PATCH v2 3/3] mctp: Add MCTP-over-KCS transport binding
> config: sh-allyesconfig (https://download.01.org/0day-ci/archive/20231003/202310030640.tYeSJjeI-lkp@xxxxxxxxx/config)
> compiler: sh4-linux-gcc (GCC) 13.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231003/202310030640.tYeSJjeI-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/202310030640.tYeSJjeI-lkp@xxxxxxxxx/
>
> All warnings (new ones prefixed by >>):
>
>    drivers/net/mctp/mctp-kcs.c: In function 'kcs_bmc_mctp_add_device':
> >> drivers/net/mctp/mctp-kcs.c:494:31: warning: passing argument 2 of 'dev_err_probe' makes integer from pointer without a cast [-Wint-conversion]
>      494 |                               "alloc_netdev failed for KCS channel %d\n",
>          |                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>          |                               |
>          |                               char *
>    In file included from include/linux/device.h:15,
>                     from include/linux/acpi.h:14,
>                     from include/linux/i2c.h:13,
>                     from drivers/net/mctp/mctp-kcs.c:16:
>    include/linux/dev_printk.h:277:64: note: expected 'int' but argument is of type 'char *'
>      277 | __printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
>          |                                                            ~~~~^~~
> >> drivers/net/mctp/mctp-kcs.c:495:38: warning: passing argument 3 of 'dev_err_probe' makes pointer from integer without a cast [-Wint-conversion]
>      495 |                               kcs_bmc->channel);
>          |                               ~~~~~~~^~~~~~~~~
>          |                                      |
>          |                                      u32 {aka unsigned int}
>    include/linux/dev_printk.h:277:81: note: expected 'const char *' but argument is of type 'u32' {aka 'unsigned int'}
>      277 | __printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
>          |                                                                     ~~~~~~~~~~~~^~~
>    drivers/net/mctp/mctp-kcs.c:507:25: warning: passing argument 2 of 'dev_err_probe' makes integer from pointer without a cast [-Wint-conversion]
>      507 |                         "failed to allocate data_in buffer for KCS channel %d\n",
>          |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>          |                         |
>          |                         char *
>    include/linux/dev_printk.h:277:64: note: expected 'int' but argument is of type 'char *'
>      277 | __printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
>          |                                                            ~~~~^~~
>    drivers/net/mctp/mctp-kcs.c:508:32: warning: passing argument 3 of 'dev_err_probe' makes pointer from integer without a cast [-Wint-conversion]
>      508 |                         kcs_bmc->channel);
>          |                         ~~~~~~~^~~~~~~~~
>          |                                |
>          |                                u32 {aka unsigned int}
>    include/linux/dev_printk.h:277:81: note: expected 'const char *' but argument is of type 'u32' {aka 'unsigned int'}
>      277 | __printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
>          |                                                                     ~~~~~~~~~~~~^~~
>    drivers/net/mctp/mctp-kcs.c:516:25: warning: passing argument 2 of 'dev_err_probe' makes integer from pointer without a cast [-Wint-conversion]
>      516 |                         "failed to allocate data_out buffer for KCS channel %d\n",
>          |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>          |                         |
>          |                         char *
>    include/linux/dev_printk.h:277:64: note: expected 'int' but argument is of type 'char *'
>      277 | __printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
>          |                                                            ~~~~^~~
>    drivers/net/mctp/mctp-kcs.c:517:32: warning: passing argument 3 of 'dev_err_probe' makes pointer from integer without a cast [-Wint-conversion]
>      517 |                         kcs_bmc->channel);
>          |                         ~~~~~~~^~~~~~~~~
>          |                                |
>          |                                u32 {aka unsigned int}
>    include/linux/dev_printk.h:277:81: note: expected 'const char *' but argument is of type 'u32' {aka 'unsigned int'}
>      277 | __printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
>          |                                                                     ~~~~~~~~~~~~^~~
>
>
> vim +/dev_err_probe +494 drivers/net/mctp/mctp-kcs.c
>
>    481
>    482  static int kcs_bmc_mctp_add_device(struct kcs_bmc_device *kcs_bmc)
>    483  {
>    484          struct mctp_kcs *mkcs;
>    485          struct net_device *ndev;
>    486          char name[32];
>    487          int rc;
>    488
>    489          snprintf(name, sizeof(name), "mctpkcs%d", kcs_bmc->channel);
>    490
>    491          ndev = alloc_netdev(sizeof(*mkcs), name, NET_NAME_ENUM, mctp_kcs_setup);
>    492          if (!ndev) {
>    493                  dev_err_probe(kcs_bmc->dev,
>  > 494                                "alloc_netdev failed for KCS channel %d\n",
>  > 495                                kcs_bmc->channel);
>    496                  return -ENOMEM;
>    497          }
>    498
>    499          mkcs = netdev_priv(ndev);
>    500          mkcs->netdev = ndev;
>    501          mkcs->client.dev = kcs_bmc;
>    502          mkcs->client.ops = &kcs_bmc_mctp_client_ops;
>    503          mkcs->data_in = devm_kmalloc(kcs_bmc->dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
>    504          if (!mkcs->data_in) {
>    505                  dev_err_probe(
>    506                          kcs_bmc->dev,
>    507                          "failed to allocate data_in buffer for KCS channel %d\n",
>    508                          kcs_bmc->channel);
>    509                  rc = -ENOMEM;
>    510                  goto free_netdev;
>    511          }
>    512          mkcs->data_out = devm_kmalloc(kcs_bmc->dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
>    513          if (!mkcs->data_out) {
>    514                  dev_err_probe(
>    515                          kcs_bmc->dev,
>    516                          "failed to allocate data_out buffer for KCS channel %d\n",
>    517                          kcs_bmc->channel);
>    518                  rc = -ENOMEM;
>    519                  goto free_netdev;
>    520          }
>    521
>    522          INIT_WORK(&mkcs->rx_work, mctp_kcs_rx_work);
>    523
>    524          rc = register_netdev(ndev);
>    525          if (rc)
>    526                  goto free_netdev;
>    527
>    528          spin_lock_irq(&kcs_bmc_mctp_instances_lock);
>    529          list_add(&mkcs->entry, &kcs_bmc_mctp_instances);
>    530          spin_unlock_irq(&kcs_bmc_mctp_instances_lock);
>    531
>    532          dev_info(kcs_bmc->dev, "Add MCTP client for the KCS channel %d",
>    533                   kcs_bmc->channel);
>    534          return 0;
>    535
>    536  free_netdev:
>    537          free_netdev(ndev);
>    538
>    539          return rc;
>    540  }
>    541
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki