Re: [PATCH] [v1] spi: spi-mtk-nor: Modify the clock architecture of nor controller

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

Hi mtk22730,

kernel test robot noticed the following build warnings:

[auto build test WARNING on broonie-spi/for-next]
[also build test WARNING on linus/master v6.13-rc3 next-20241220]
[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/mtk22730/spi-spi-mtk-nor-Modify-the-clock-architecture-of-nor-controller/20241212-172704
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next
patch link:    https://lore.kernel.org/r/20241212092206.14071-1-Cloud.Zhang%40mediatek.com
patch subject: [PATCH] [v1] spi: spi-mtk-nor: Modify the clock architecture of nor controller
config: um-randconfig-002-20241220 (https://download.01.org/0day-ci/archive/20241221/202412210247.Brq06CHb-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 9daf10ff8f29ba3a88a105aaa9d2379c21b77d35)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241221/202412210247.Brq06CHb-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/202412210247.Brq06CHb-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/spi/spi-mtk-nor.c:10:
   In file included from include/linux/dma-mapping.h:8:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:2223:
   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/spi/spi-mtk-nor.c:10:
   In file included from include/linux/dma-mapping.h:8:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/um/include/asm/io.h:24:
   include/asm-generic/io.h:549:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     549 |         val = __raw_readb(PCI_IOBASE + addr);
         |                           ~~~~~~~~~~ ^
   include/asm-generic/io.h:567:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     567 |         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/spi/spi-mtk-nor.c:10:
   In file included from include/linux/dma-mapping.h:8:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/um/include/asm/io.h:24:
   include/asm-generic/io.h:585:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     585 |         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/spi/spi-mtk-nor.c:10:
   In file included from include/linux/dma-mapping.h:8:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/um/include/asm/io.h:24:
   include/asm-generic/io.h:601:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     601 |         __raw_writeb(value, PCI_IOBASE + addr);
         |                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:616:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     616 |         __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:631:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     631 |         __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:724:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     724 |         readsb(PCI_IOBASE + addr, buffer, count);
         |                ~~~~~~~~~~ ^
   include/asm-generic/io.h:737:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     737 |         readsw(PCI_IOBASE + addr, buffer, count);
         |                ~~~~~~~~~~ ^
   include/asm-generic/io.h:750:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     750 |         readsl(PCI_IOBASE + addr, buffer, count);
         |                ~~~~~~~~~~ ^
   include/asm-generic/io.h:764:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     764 |         writesb(PCI_IOBASE + addr, buffer, count);
         |                 ~~~~~~~~~~ ^
   include/asm-generic/io.h:778:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     778 |         writesw(PCI_IOBASE + addr, buffer, count);
         |                 ~~~~~~~~~~ ^
   include/asm-generic/io.h:792:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     792 |         writesl(PCI_IOBASE + addr, buffer, count);
         |                 ~~~~~~~~~~ ^
>> drivers/spi/spi-mtk-nor.c:746:19: warning: result of comparison of constant -22 with expression of type 'u8' (aka 'unsigned char') is always false [-Wtautological-constant-out-of-range-compare]
     746 |         if (!cnt || (cnt == -EINVAL)) {
         |                      ~~~ ^  ~~~~~~~
   14 warnings generated.


vim +746 drivers/spi/spi-mtk-nor.c

   737	
   738	static int mtk_nor_parse_clk(struct device *dev, struct mtk_nor *sp)
   739	{
   740		struct device_node *np = dev->of_node;
   741		int ret;
   742		const char *name;
   743		u8 cnt, i;
   744	
   745		cnt = of_property_count_strings(np, "clock-names");
 > 746		if (!cnt || (cnt == -EINVAL)) {
   747			dev_err(dev, "Unable to find clocks\n");
   748			ret = -EINVAL;
   749			goto out;
   750		} else if (cnt < 0) {
   751			dev_err(dev, "Count clock strings failed, err %d\n", cnt);
   752			ret = cnt;
   753			goto out;
   754		} else if (cnt > MAX_CLOCK_CNT) {
   755			ret = -EINVAL;
   756			goto out;
   757		}
   758	
   759		sp->clock_cnt = cnt;
   760	
   761		for (i = 0; i < cnt; i++) {
   762			ret = of_property_read_string_index(np, "clock-names", i,
   763					       &name);
   764			if (ret) {
   765				dev_err(dev, "failed to get clock string\n");
   766				return ret;
   767			}
   768	
   769			sp->clocks[i].name = name;
   770			sp->clocks[i].clki = devm_clk_get(dev, sp->clocks[i].name);
   771			if (IS_ERR(sp->clocks[i].clki)) {
   772				dev_err(dev, "get clock %s fail\n", sp->clocks[i].name);
   773				return PTR_ERR(sp->clocks[i].clki);
   774			}
   775		}
   776	
   777	out:
   778		return ret;
   779	}
   780	

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