Re: [PATCH v2 2/8] genirq: soft_moderation: add base files, procfs

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

Hi Luigi,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/irq/core]
[also build test ERROR on tip/x86/core tip/master linus/master v6.18-rc6 next-20251117]
[cannot apply to tip/auto-latest]
[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/Luigi-Rizzo/genirq-platform-wide-interrupt-moderation-Documentation-Kconfig-irq_desc/20251117-023148
base:   tip/irq/core
patch link:    https://lore.kernel.org/r/20251116182839.939139-3-lrizzo%40google.com
patch subject: [PATCH v2 2/8] genirq: soft_moderation: add base files, procfs
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20251118/202511180547.snSezdSu-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251118/202511180547.snSezdSu-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/202511180547.snSezdSu-lkp@intel.com/

All errors (new ones prefixed by >>):

   kernel/irq/irq_moderation.c:103: warning: ignoring '#pragma clang diagnostic' [-Wunknown-pragmas]
     103 | #pragma clang diagnostic error "-Wformat"
   In file included from include/linux/uaccess.h:10,
                    from include/linux/sched/task.h:13,
                    from include/linux/sched/signal.h:9,
                    from include/linux/rcuwait.h:6,
                    from include/linux/percpu-rwsem.h:7,
                    from include/linux/fs.h:34,
                    from include/linux/seq_file.h:11,
                    from kernel/irq/irq_moderation.c:8:
   In function 'check_copy_size',
       inlined from 'copy_from_user' at include/linux/uaccess.h:207:7,
       inlined from 'moderation_write' at kernel/irq/irq_moderation.c:169:6:
>> include/linux/ucopysize.h:54:25: error: call to '__bad_copy_to' declared with attribute error: copy destination size is too small
      54 |                         __bad_copy_to();
         |                         ^~~~~~~~~~~~~~~
   In function 'check_copy_size',
       inlined from 'copy_from_user' at include/linux/uaccess.h:207:7,
       inlined from 'mode_write' at kernel/irq/irq_moderation.c:223:6:
>> include/linux/ucopysize.h:54:25: error: call to '__bad_copy_to' declared with attribute error: copy destination size is too small
      54 |                         __bad_copy_to();
         |                         ^~~~~~~~~~~~~~~


vim +/__bad_copy_to +54 include/linux/ucopysize.h

808aac63e2bdf9 Kees Cook 2025-02-28  43  
808aac63e2bdf9 Kees Cook 2025-02-28  44  static __always_inline __must_check bool
808aac63e2bdf9 Kees Cook 2025-02-28  45  check_copy_size(const void *addr, size_t bytes, bool is_source)
808aac63e2bdf9 Kees Cook 2025-02-28  46  {
808aac63e2bdf9 Kees Cook 2025-02-28  47  	int sz = __builtin_object_size(addr, 0);
808aac63e2bdf9 Kees Cook 2025-02-28  48  	if (unlikely(sz >= 0 && sz < bytes)) {
808aac63e2bdf9 Kees Cook 2025-02-28  49  		if (!__builtin_constant_p(bytes))
808aac63e2bdf9 Kees Cook 2025-02-28  50  			copy_overflow(sz, bytes);
808aac63e2bdf9 Kees Cook 2025-02-28  51  		else if (is_source)
808aac63e2bdf9 Kees Cook 2025-02-28  52  			__bad_copy_from();
808aac63e2bdf9 Kees Cook 2025-02-28  53  		else
808aac63e2bdf9 Kees Cook 2025-02-28 @54  			__bad_copy_to();
808aac63e2bdf9 Kees Cook 2025-02-28  55  		return false;
808aac63e2bdf9 Kees Cook 2025-02-28  56  	}
808aac63e2bdf9 Kees Cook 2025-02-28  57  	if (WARN_ON_ONCE(bytes > INT_MAX))
808aac63e2bdf9 Kees Cook 2025-02-28  58  		return false;
808aac63e2bdf9 Kees Cook 2025-02-28  59  	check_object_size(addr, bytes, is_source);
808aac63e2bdf9 Kees Cook 2025-02-28  60  	return true;
808aac63e2bdf9 Kees Cook 2025-02-28  61  }
808aac63e2bdf9 Kees Cook 2025-02-28  62  

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