Re: [PATCH 2/2] iommu/io-pgtable: Add ARM SMMUv3 page table dump support

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

Hi Qinxin,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master v6.17-rc1 next-20250815]
[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/Qinxin-Xia/iommu-debug-Add-IOMMU-page-table-dump-debug-facility/20250814-173720
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20250814093005.2040511-3-xiaqinxin%40huawei.com
patch subject: [PATCH 2/2] iommu/io-pgtable: Add ARM SMMUv3 page table dump support
config: s390-allyesconfig (https://download.01.org/0day-ci/archive/20250815/202508151641.JHlhcDRk-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250815/202508151641.JHlhcDRk-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/202508151641.JHlhcDRk-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:22,
                    from arch/s390/include/asm/bug.h:69,
                    from include/linux/bug.h:5,
                    from include/linux/mmdebug.h:5,
                    from arch/s390/include/asm/cmpxchg.h:11,
                    from arch/s390/include/asm/atomic.h:16,
                    from include/linux/atomic.h:7,
                    from drivers/iommu/io-pgtable-arm.c:12:
   drivers/iommu/io-pgtable-arm.c: In function 'dump_prot':
>> include/linux/kern_levels.h:5:25: warning: format '%zu' expects argument of type 'size_t', but argument 2 has type 'int' [-Wformat=]
       5 | #define KERN_SOH        "\001"          /* ASCII Start Of Header */
         |                         ^~~~~~
   include/linux/printk.h:486:25: note: in definition of macro 'printk_index_wrap'
     486 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                         ^~~~
   include/linux/printk.h:557:9: note: in expansion of macro 'printk'
     557 |         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~
   include/linux/kern_levels.h:11:25: note: in expansion of macro 'KERN_SOH'
      11 | #define KERN_ERR        KERN_SOH "3"    /* error conditions */
         |                         ^~~~~~~~
   include/linux/printk.h:557:16: note: in expansion of macro 'KERN_ERR'
     557 |         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
         |                ^~~~~~~~
   drivers/iommu/io-pgtable-arm.c:882:25: note: in expansion of macro 'pr_err'
     882 |                         pr_err("len = %zu, attr = %s, i =%d\n", length, attr, i);
         |                         ^~~~~~
>> include/linux/kern_levels.h:5:25: warning: format '%d' expects argument of type 'int', but argument 4 has type 'size_t' {aka 'long unsigned int'} [-Wformat=]
       5 | #define KERN_SOH        "\001"          /* ASCII Start Of Header */
         |                         ^~~~~~
   include/linux/printk.h:486:25: note: in definition of macro 'printk_index_wrap'
     486 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                         ^~~~
   include/linux/printk.h:557:9: note: in expansion of macro 'printk'
     557 |         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~
   include/linux/kern_levels.h:11:25: note: in expansion of macro 'KERN_SOH'
      11 | #define KERN_ERR        KERN_SOH "3"    /* error conditions */
         |                         ^~~~~~~~
   include/linux/printk.h:557:16: note: in expansion of macro 'KERN_ERR'
     557 |         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
         |                ^~~~~~~~
   drivers/iommu/io-pgtable-arm.c:882:25: note: in expansion of macro 'pr_err'
     882 |                         pr_err("len = %zu, attr = %s, i =%d\n", length, attr, i);
         |                         ^~~~~~
   drivers/iommu/io-pgtable-arm.c: In function 'arm_lpae_dump_iova_prot':
>> drivers/iommu/io-pgtable-arm.c:911:32: warning: format '%lx' expects argument of type 'long unsigned int', but argument 4 has type 'long long unsigned int' [-Wformat=]
     911 |         seq_printf(s, "%lx - %lx    lvl %d  stage %s ",
         |                              ~~^
         |                                |
         |                                long unsigned int
         |                              %llx


vim +911 drivers/iommu/io-pgtable-arm.c

   891	
   892	static size_t arm_lpae_dump_iova_prot(struct seq_file *s, struct io_pgtable_ops *ops,
   893									   unsigned long iova)
   894	{
   895		struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
   896		struct iova_to_phys_data d;
   897		int ret;
   898	
   899		struct io_pgtable_walk_data walk_data = {
   900			.data = &d,
   901			.visit = visit_iova_to_phys,
   902			.addr = iova,
   903			.end = iova + 1,
   904		};
   905	
   906		/* Only the mapped iova will be output */
   907		ret = __arm_lpae_iopte_walk(data, &walk_data, data->pgd, data->start_level);
   908		if (ret)
   909			return ARM_LPAE_GRANULE(data);
   910	
 > 911		seq_printf(s, "%lx - %lx    lvl %d  stage %s ",
   912				   iova, iova + ARM_LPAE_BLOCK_SIZE(d.lvl, data),
   913				   d.lvl, io_pgtable_fmt_names[data->iop.fmt]);
   914	
   915		/* TODO: The dump prot is incomplete and will be supplemented later... */
   916		dump_prot(s, d.pte);
   917		seq_puts(s, "\n");
   918	
   919		return ARM_LPAE_BLOCK_SIZE(d.lvl, data);
   920	}
   921	#endif
   922	

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