Re: [PATCH 4/4] s390/maccess: Remove spinlock from __s390_kernel_write()

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

Hi Heiko,

kernel test robot noticed the following build errors:

[auto build test ERROR on s390/features]
[also build test ERROR on trace/for-next bpf-next/master bpf/master linus/master v7.3 next-20261026]
[cannot apply to bpf-next/net]
[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/Heiko-Carstens/s390-jump_label-Serialize-text-patching-with-text_mutex/20261026-130326
base:   https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git features
patch link:    https://lore.kernel.org/r/20261026120329.1792436-5-hca%40linux.ibm.com
patch subject: [PATCH 4/4] s390/maccess: Remove spinlock from __s390_kernel_write()
config: s390-allnoconfig (https://download.01.org/0day-ci/archive/20261027/202610271725.YBK6zlkf-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 186e70f4e6a1521991d2340d3d49b23b1beff11f)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261027/202610271725.YBK6zlkf-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/202610271725.YBK6zlkf-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/s390/mm/maccess.c:9:
>> include/linux/text-patching.h:10:9: error: call to undeclared library function 'memcpy' with type 'void *(void *, const void *, __size_t)' (aka 'void *(void *, const void *, unsigned long)'); ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      10 |         return memcpy(dst, src, len);
         |                ^
   include/linux/text-patching.h:10:9: note: include the header <string.h> or explicitly provide a declaration for 'memcpy'
   In file included from arch/s390/mm/maccess.c:15:
   In file included from include/linux/cpu.h:17:
   In file included from include/linux/node.h:18:
   In file included from include/linux/device.h:32:
   In file included from include/linux/device/driver.h:21:
   In file included from include/linux/module.h:20:
   In file included from include/linux/elf.h:6:
   In file included from arch/s390/include/asm/elf.h:173:
   In file included from arch/s390/include/asm/mmu_context.h:11:
   In file included from arch/s390/include/asm/pgalloc.h:18:
   In file included from include/linux/mm.h:36:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:7:
   include/linux/signal.h:98:11: warning: array index 3 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
      98 |                 return (set->sig[3] | set->sig[2] |
         |                         ^        ~
   arch/s390/include/asm/signal.h:22:9: note: array 'sig' declared here
      22 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/s390/mm/maccess.c:15:
   In file included from include/linux/cpu.h:17:
   In file included from include/linux/node.h:18:
   In file included from include/linux/device.h:32:
   In file included from include/linux/device/driver.h:21:
   In file included from include/linux/module.h:20:
   In file included from include/linux/elf.h:6:
   In file included from arch/s390/include/asm/elf.h:173:
   In file included from arch/s390/include/asm/mmu_context.h:11:
   In file included from arch/s390/include/asm/pgalloc.h:18:
   In file included from include/linux/mm.h:36:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:7:
   include/linux/signal.h:98:25: warning: array index 2 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
      98 |                 return (set->sig[3] | set->sig[2] |
         |                                       ^        ~
   arch/s390/include/asm/signal.h:22:9: note: array 'sig' declared here
      22 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/s390/mm/maccess.c:15:
   In file included from include/linux/cpu.h:17:
   In file included from include/linux/node.h:18:
   In file included from include/linux/device.h:32:
   In file included from include/linux/device/driver.h:21:
   In file included from include/linux/module.h:20:
   In file included from include/linux/elf.h:6:
   In file included from arch/s390/include/asm/elf.h:173:
   In file included from arch/s390/include/asm/mmu_context.h:11:
   In file included from arch/s390/include/asm/pgalloc.h:18:
   In file included from include/linux/mm.h:36:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:7:
   include/linux/signal.h:99:4: warning: array index 1 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
      99 |                         set->sig[1] | set->sig[0]) == 0;
         |                         ^        ~
   arch/s390/include/asm/signal.h:22:9: note: array 'sig' declared here
      22 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/s390/mm/maccess.c:15:
   In file included from include/linux/cpu.h:17:
   In file included from include/linux/node.h:18:
   In file included from include/linux/device.h:32:
   In file included from include/linux/device/driver.h:21:
   In file included from include/linux/module.h:20:
   In file included from include/linux/elf.h:6:
   In file included from arch/s390/include/asm/elf.h:173:
   In file included from arch/s390/include/asm/mmu_context.h:11:
   In file included from arch/s390/include/asm/pgalloc.h:18:
   In file included from include/linux/mm.h:36:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:7:
   include/linux/signal.h:101:11: warning: array index 1 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
     101 |                 return (set->sig[1] | set->sig[0]) == 0;
         |                         ^        ~
   arch/s390/include/asm/signal.h:22:9: note: array 'sig' declared here
      22 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/s390/mm/maccess.c:15:
   In file included from include/linux/cpu.h:17:
   In file included from include/linux/node.h:18:
   In file included from include/linux/device.h:32:
   In file included from include/linux/device/driver.h:21:
   In file included from include/linux/module.h:20:
   In file included from include/linux/elf.h:6:
   In file included from arch/s390/include/asm/elf.h:173:
   In file included from arch/s390/include/asm/mmu_context.h:11:
   In file included from arch/s390/include/asm/pgalloc.h:18:
   In file included from include/linux/mm.h:36:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:7:
   include/linux/signal.h:114:11: warning: array index 3 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
     114 |                 return  (set1->sig[3] == set2->sig[3]) &&
         |                          ^         ~
   arch/s390/include/asm/signal.h:22:9: note: array 'sig' declared here
      22 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/s390/mm/maccess.c:15:
   In file included from include/linux/cpu.h:17:


vim +10 include/linux/text-patching.h

0c3beacf681ec8 Mike Rapoport (Microsoft  2024-10-23   6) 
0c3beacf681ec8 Mike Rapoport (Microsoft  2024-10-23   7) #ifndef text_poke_copy
0c3beacf681ec8 Mike Rapoport (Microsoft  2024-10-23   8) static inline void *text_poke_copy(void *dst, const void *src, size_t len)
0c3beacf681ec8 Mike Rapoport (Microsoft  2024-10-23   9) {
0c3beacf681ec8 Mike Rapoport (Microsoft  2024-10-23 @10) 	return memcpy(dst, src, len);
0c3beacf681ec8 Mike Rapoport (Microsoft  2024-10-23  11) }
0c3beacf681ec8 Mike Rapoport (Microsoft  2024-10-23  12) #define text_poke_copy text_poke_copy
0c3beacf681ec8 Mike Rapoport (Microsoft  2024-10-23  13) #endif
0c3beacf681ec8 Mike Rapoport (Microsoft  2024-10-23  14) 

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