Re: [PATCH v8 14/15] mm/kasan: Introduce helpers for lazy MMU mode sanitizer

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

Hi Alexander,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v7.3-rc6]
[cannot apply to akpm-mm/mm-everything s390/features kvms390/next next-20261006]
[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/Alexander-Gordeev/mm-introduce-hw_pte_t-for-PTE-table-storage/20261007-134144
base:   linus/master
patch link:    https://lore.kernel.org/r/e42d9f02ec1f8478a50fce424b95d0e7ff6a359f.1791365932.git.agordeev%40linux.ibm.com
patch subject: [PATCH v8 14/15] mm/kasan: Introduce helpers for lazy MMU mode sanitizer
config: mips-bmips_stb_defconfig (https://download.01.org/0day-ci/archive/20261008/202610080445.ZlyXFoBC-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261008/202610080445.ZlyXFoBC-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/202610080445.ZlyXFoBC-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/mips/kernel/asm-offsets.c:14:
   In file included from include/linux/compat.h:17:
   In file included from include/linux/fs.h:45:
   In file included from include/linux/slab.h:276:
   In file included from include/linux/kasan.h:9:
   In file included from include/linux/pgtable.h:6:
   In file included from arch/mips/include/asm/pgtable.h:14:
   In file included from arch/mips/include/asm/pgtable-32.h:22:
   In file included from arch/mips/include/asm/highmem.h:24:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/mips/include/asm/hardirq.h:16:
   In file included from include/asm-generic/hardirq.h:17:
   include/linux/irq.h:1211:2: error: call to undeclared function 'kfree'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1211 |         kfree(gc);
         |         ^
   In file included from arch/mips/kernel/asm-offsets.c:14:
   In file included from include/linux/compat.h:17:
   In file included from include/linux/fs.h:45:
>> include/linux/slab.h:595:6: error: conflicting types for 'kfree'
     595 | void kfree(const void *objp);
         |      ^
   include/linux/irq.h:1211:2: note: previous implicit declaration is here
    1211 |         kfree(gc);
         |         ^
   In file included from arch/mips/kernel/asm-offsets.c:26:
   In file included from include/linux/kvm_host.h:5:
   In file included from include/linux/entry-virt.h:7:
   In file included from include/linux/syscalls.h:95:
   In file included from include/trace/syscall.h:7:
   In file included from include/linux/trace_events.h:6:
   In file included from include/linux/ring_buffer.h:6:
   include/linux/poll.h:134:27: warning: division by zero is undefined [-Wdivision-by-zero]
     134 |                 M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) |
         |                                         ^~~~~~~~~
   include/linux/poll.h:132:32: note: expanded from macro 'M'
     132 | #define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X)
         |                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/poll.h:118:51: note: expanded from macro '__MAP'
     118 |         (from < to ? (v & from) * (to/from) : (v & from) / (from/to))
         |                                                          ^ ~~~~~~~~~
   include/linux/poll.h:134:39: warning: division by zero is undefined [-Wdivision-by-zero]
     134 |                 M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) |
         |                                                     ^~~~~~~~~
   include/linux/poll.h:132:32: note: expanded from macro 'M'
     132 | #define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X)
         |                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/poll.h:118:51: note: expanded from macro '__MAP'
     118 |         (from < to ? (v & from) * (to/from) : (v & from) / (from/to))
         |                                                          ^ ~~~~~~~~~
   2 warnings and 2 errors generated.
   make[3]: *** [scripts/Makefile.build:185: arch/mips/kernel/asm-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1425: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:248: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +/kfree +595 include/linux/slab.h

7bd230a26648ac Suren Baghdasaryan 2024-03-21  594  
72d67229f522e3 Kees Cook          2021-11-05 @595  void kfree(const void *objp);
af92793e52c3a9 Alexei Starovoitov 2025-09-08  596  void kfree_nolock(const void *objp);
72d67229f522e3 Kees Cook          2021-11-05  597  void kfree_sensitive(const void *objp);
05a940656e1eb2 Kees Cook          2022-09-23  598  

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