linux-kernel - Re: [PATCH-v3 1/3] genirq: Fixed Global Software Interrupt Moderation (GSIM)

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Message-ID: <202512211933.p2Yg8Zzq-lkp@intel.com>
Date: Sun, 21 Dec 2025 19:21:23 +0800
From: kernel test robot <lkp@...el.com>
To: Luigi Rizzo <lrizzo@...gle.com>, Thomas Gleixner <tglx@...utronix.de>,
	Marc Zyngier <maz@...nel.org>, Luigi Rizzo <rizzo.unipi@...il.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc: oe-kbuild-all@...ts.linux.dev,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Bjorn Helgaas <helgaas@...nel.org>,
	Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH-v3 1/3] genirq: Fixed Global Software Interrupt
 Moderation (GSIM)

Hi Luigi,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/irq/core]
[also build test ERROR on linus/master v6.19-rc1]
[cannot apply to next-20251219]
[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-Fixed-Global-Software-Interrupt-Moderation-GSIM/20251217-193249
base:   tip/irq/core
patch link:    https://lore.kernel.org/r/20251217112128.1401896-2-lrizzo%40google.com
patch subject: [PATCH-v3 1/3] genirq: Fixed Global Software Interrupt Moderation (GSIM)
config: um-allyesconfig (https://download.01.org/0day-ci/archive/20251221/202512211933.p2Yg8Zzq-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251221/202512211933.p2Yg8Zzq-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512211933.p2Yg8Zzq-lkp@intel.com/

All errors (new ones prefixed by >>):

   kernel/irq/irq_moderation.c:141: warning: ignoring '#pragma clang diagnostic' [-Wunknown-pragmas]
     141 | #pragma clang diagnostic error "-Wformat"
   In file included from include/linux/uaccess.h:11,
                    from include/linux/sched/task.h:13,
                    from include/linux/sched/signal.h:9,
                    from include/linux/rcuwait.h:6,
                    from include/linux/mm.h:36,
                    from include/linux/kallsyms.h:13,
                    from kernel/irq/irq_moderation.c:7:
   In function 'check_copy_size',
       inlined from 'copy_from_user' at include/linux/uaccess.h:218:7,
       inlined from 'mode_write' at kernel/irq/irq_moderation.c:259:6:
>> 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  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki