Re: [PATCH v7 1/8] mfd: core: make platform_data pointer const in struct mfd_cell

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Hi Heiko,

kernel test robot noticed the following build errors:

[auto build test ERROR on next-20240905]
[also build test ERROR on v6.11-rc6]
[cannot apply to lee-mfd/for-mfd-next groeck-staging/hwmon-next lee-leds/for-leds-next linus/master lee-mfd/for-mfd-fixes v6.11-rc6 v6.11-rc5 v6.11-rc4]
[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/Heiko-Stuebner/mfd-core-make-platform_data-pointer-const-in-struct-mfd_cell/20240906-025553
base:   next-20240905
patch link:    https://lore.kernel.org/r/20240905185232.2899464-2-heiko%40sntech.de
patch subject: [PATCH v7 1/8] mfd: core: make platform_data pointer const in struct mfd_cell
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20240908/202409081514.inB0qj3o-lkp@xxxxxxxxx/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 05f5a91d00b02f4369f46d076411c700755ae041)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240908/202409081514.inB0qj3o-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/202409081514.inB0qj3o-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

   In file included from drivers/hid/hid-sensor-hub.c:8:
   In file included from include/linux/hid.h:29:
   In file included from include/linux/hid_bpf.h:6:
   In file included from include/linux/bpf.h:21:
   In file included from include/linux/kallsyms.h:13:
   In file included from include/linux/mm.h:2206:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from drivers/hid/hid-sensor-hub.c:8:
   In file included from include/linux/hid.h:29:
   In file included from include/linux/hid_bpf.h:6:
   In file included from include/linux/bpf.h:31:
   In file included from include/linux/memcontrol.h:13:
   In file included from include/linux/cgroup.h:26:
   In file included from include/linux/kernel_stat.h:8:
   In file included from include/linux/interrupt.h:11:
   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:14:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     548 |         val = __raw_readb(PCI_IOBASE + addr);
         |                           ~~~~~~~~~~ ^
   include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     561 |         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 drivers/hid/hid-sensor-hub.c:8:
   In file included from include/linux/hid.h:29:
   In file included from include/linux/hid_bpf.h:6:
   In file included from include/linux/bpf.h:31:
   In file included from include/linux/memcontrol.h:13:
   In file included from include/linux/cgroup.h:26:
   In file included from include/linux/kernel_stat.h:8:
   In file included from include/linux/interrupt.h:11:
   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:14:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     574 |         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 drivers/hid/hid-sensor-hub.c:8:
   In file included from include/linux/hid.h:29:
   In file included from include/linux/hid_bpf.h:6:
   In file included from include/linux/bpf.h:31:
   In file included from include/linux/memcontrol.h:13:
   In file included from include/linux/cgroup.h:26:
   In file included from include/linux/kernel_stat.h:8:
   In file included from include/linux/interrupt.h:11:
   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:14:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     585 |         __raw_writeb(value, PCI_IOBASE + addr);
         |                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     595 |         __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     605 |         __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
>> drivers/hid/hid-sensor-hub.c:744:33: error: initializing 'struct hid_sensor_hub_device *' with an expression of type 'const void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
     744 |                 struct hid_sensor_hub_device *hsdev =
         |                                               ^
     745 |                         data->hid_sensor_hub_client_devs[i].platform_data;
         |                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7 warnings and 1 error generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for OMAP2PLUS_MBOX
   Depends on [n]: MAILBOX [=y] && (ARCH_OMAP2PLUS || ARCH_K3)
   Selected by [m]:
   - TI_K3_M4_REMOTEPROC [=m] && REMOTEPROC [=y] && (ARCH_K3 || COMPILE_TEST [=y])


vim +744 drivers/hid/hid-sensor-hub.c

401ca24fb34aee srinivas pandruvada 2012-09-05  732  
401ca24fb34aee srinivas pandruvada 2012-09-05  733  static void sensor_hub_remove(struct hid_device *hdev)
401ca24fb34aee srinivas pandruvada 2012-09-05  734  {
401ca24fb34aee srinivas pandruvada 2012-09-05  735  	struct sensor_hub_data *data = hid_get_drvdata(hdev);
401ca24fb34aee srinivas pandruvada 2012-09-05  736  	unsigned long flags;
e651a1da442ae0 Srinivas Pandruvada 2015-02-19  737  	int i;
401ca24fb34aee srinivas pandruvada 2012-09-05  738  
401ca24fb34aee srinivas pandruvada 2012-09-05  739  	hid_dbg(hdev, " hardware removed\n");
401ca24fb34aee srinivas pandruvada 2012-09-05  740  	hid_hw_close(hdev);
f2f13a68c37c13 Axel Lin            2012-09-19  741  	hid_hw_stop(hdev);
401ca24fb34aee srinivas pandruvada 2012-09-05  742  	spin_lock_irqsave(&data->lock, flags);
e651a1da442ae0 Srinivas Pandruvada 2015-02-19  743  	for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
e651a1da442ae0 Srinivas Pandruvada 2015-02-19 @744  		struct hid_sensor_hub_device *hsdev =
e651a1da442ae0 Srinivas Pandruvada 2015-02-19  745  			data->hid_sensor_hub_client_devs[i].platform_data;
e651a1da442ae0 Srinivas Pandruvada 2015-02-19  746  		if (hsdev->pending.status)
e651a1da442ae0 Srinivas Pandruvada 2015-02-19  747  			complete(&hsdev->pending.ready);
e651a1da442ae0 Srinivas Pandruvada 2015-02-19  748  	}
401ca24fb34aee srinivas pandruvada 2012-09-05  749  	spin_unlock_irqrestore(&data->lock, flags);
401ca24fb34aee srinivas pandruvada 2012-09-05  750  	mfd_remove_devices(&hdev->dev);
401ca24fb34aee srinivas pandruvada 2012-09-05  751  	mutex_destroy(&data->mutex);
401ca24fb34aee srinivas pandruvada 2012-09-05  752  }
401ca24fb34aee srinivas pandruvada 2012-09-05  753  

-- 
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