Re: [PATCH 2/4] hwspinlock: brcmstb hardware semaphore support

[kernel test robot <lkp@intel.com>]

Hi Kamal,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linus/master v6.16-rc5 next-20250711]
[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/Kamal-Dasu/dt-bindings-brcmstb-hwspinlock-support-for-hwspinlock/20250712-034624
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20250711154221.928164-4-kamal.dasu%40broadcom.com
patch subject: [PATCH 2/4] hwspinlock: brcmstb hardware semaphore support
config: arc-randconfig-r111-20250713 (https://download.01.org/0day-ci/archive/20250713/202507131422.6eIuyxUJ-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 12.4.0
reproduce: (https://download.01.org/0day-ci/archive/20250713/202507131422.6eIuyxUJ-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/202507131422.6eIuyxUJ-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/hwspinlock/brcmstb_hwspinlock.c:26:39: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected void [noderef] __iomem *lock_addr @@     got void *priv @@
   drivers/hwspinlock/brcmstb_hwspinlock.c:26:39: sparse:     expected void [noderef] __iomem *lock_addr
   drivers/hwspinlock/brcmstb_hwspinlock.c:26:39: sparse:     got void *priv
   drivers/hwspinlock/brcmstb_hwspinlock.c:35:39: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected void [noderef] __iomem *lock_addr @@     got void *priv @@
   drivers/hwspinlock/brcmstb_hwspinlock.c:35:39: sparse:     expected void [noderef] __iomem *lock_addr
   drivers/hwspinlock/brcmstb_hwspinlock.c:35:39: sparse:     got void *priv
>> drivers/hwspinlock/brcmstb_hwspinlock.c:73:30: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void *priv @@     got void [noderef] __iomem * @@
   drivers/hwspinlock/brcmstb_hwspinlock.c:73:30: sparse:     expected void *priv
   drivers/hwspinlock/brcmstb_hwspinlock.c:73:30: sparse:     got void [noderef] __iomem *

vim +26 drivers/hwspinlock/brcmstb_hwspinlock.c

    23	
    24	static int brcmstb_hwspinlock_trylock(struct hwspinlock *lock)
    25	{
  > 26		void __iomem *lock_addr = lock->priv;
    27	
    28		writel(HWSPINLOCK_VAL, lock_addr);
    29	
    30		return (readl(lock_addr) == HWSPINLOCK_VAL);
    31	}
    32	
    33	static void brcmstb_hwspinlock_unlock(struct hwspinlock *lock)
    34	{
    35		void __iomem *lock_addr = lock->priv;
    36	
    37		/* release the lock by writing 0 to it */
    38		writel(RESET_SEMAPHORE, lock_addr);
    39	}
    40	
    41	static void brcmstb_hwspinlock_relax(struct hwspinlock *lock)
    42	{
    43		ndelay(50);
    44	}
    45	
    46	static const struct hwspinlock_ops brcmstb_hwspinlock_ops = {
    47		.trylock	= brcmstb_hwspinlock_trylock,
    48		.unlock		= brcmstb_hwspinlock_unlock,
    49		.relax		= brcmstb_hwspinlock_relax,
    50	};
    51	
    52	static int brcmstb_hwspinlock_probe(struct platform_device *pdev)
    53	{
    54		struct hwspinlock_device *bank;
    55		struct hwspinlock *hwlock;
    56		void __iomem *io_base;
    57		int i, num_locks = BRCMSTB_MAX_SEMAPHORES;
    58	
    59		io_base = devm_platform_ioremap_resource(pdev, 0);
    60		if (IS_ERR(io_base)) {
    61			dev_err(&pdev->dev, "semaphore iobase mapping error\n");
    62			return PTR_ERR(io_base);
    63		}
    64	
    65		bank = devm_kzalloc(&pdev->dev, struct_size(bank, lock, num_locks),
    66				    GFP_KERNEL);
    67		if (!bank)
    68			return -ENOMEM;
    69	
    70		platform_set_drvdata(pdev, bank);
    71	
    72		for (i = 0, hwlock = &bank->lock[0]; i < num_locks; i++, hwlock++)
  > 73			hwlock->priv = io_base + sizeof(u32) * i;
    74	
    75		return devm_hwspin_lock_register(&pdev->dev, bank,
    76						 &brcmstb_hwspinlock_ops,
    77						 0, num_locks);
    78	}
    79	

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