Re: [linux-next:master 4972/5926] kernel/kexec_handover_debug.c:16:18: error: use of undeclared identifier 'kho_scratch_cnt'

[Mike Rapoport <rppt@kernel.org>]

(adding Pasha)

On Tue, Nov 04, 2025 at 10:48:31PM +0800, kernel test robot wrote:
> Hi Mike,
> 
> First bad commit (maybe != root cause):
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   17490bd0527f59d841168457b245581f314b5fa0
> commit: 8c211175c3abcebb8bffce8095d78d193e482105 [4972/5926] liveupdate-kho-warn-and-fail-on-metadata-or-preserved-memory-in-scratch-area-fix
> config: x86_64-randconfig-071-20251104 (https://download.01.org/0day-ci/archive/20251104/202511042251.paO6f5BZ-lkp@intel.com/config)
> compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251104/202511042251.paO6f5BZ-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/202511042251.paO6f5BZ-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
> >> kernel/kexec_handover_debug.c:16:18: error: use of undeclared identifier 'kho_scratch_cnt'
>       16 |         for (i = 0; i < kho_scratch_cnt; i++) {
>          |                         ^
> >> kernel/kexec_handover_debug.c:17:19: error: use of undeclared identifier 'kho_scratch'
>       17 |                 scratch_start = kho_scratch[i].addr;
>          |                                 ^
>    kernel/kexec_handover_debug.c:18:17: error: use of undeclared identifier 'kho_scratch'
>       18 |                 scratch_end = kho_scratch[i].addr + kho_scratch[i].size;
>          |                               ^
>    kernel/kexec_handover_debug.c:18:39: error: use of undeclared identifier 'kho_scratch'
>       18 |                 scratch_end = kho_scratch[i].addr + kho_scratch[i].size;
>          |                                                     ^
>    4 errors generated.
> 
> 
> vim +/kho_scratch_cnt +16 kernel/kexec_handover_debug.c
> 
> 4039a00022d42a Pasha Tatashin 2025-10-20  10  
> 4039a00022d42a Pasha Tatashin 2025-10-20  11  bool kho_scratch_overlap(phys_addr_t phys, size_t size)
> 4039a00022d42a Pasha Tatashin 2025-10-20  12  {
> 4039a00022d42a Pasha Tatashin 2025-10-20  13  	phys_addr_t scratch_start, scratch_end;
> 4039a00022d42a Pasha Tatashin 2025-10-20  14  	unsigned int i;
> 4039a00022d42a Pasha Tatashin 2025-10-20  15  
> 4039a00022d42a Pasha Tatashin 2025-10-20 @16  	for (i = 0; i < kho_scratch_cnt; i++) {
> 4039a00022d42a Pasha Tatashin 2025-10-20 @17  		scratch_start = kho_scratch[i].addr;
> 
> :::::: The code at line 16 was first introduced by commit
> :::::: 4039a00022d42ac3d68b2eea63066bc9f7ef89ce kho: warn and fail on metadata or preserved memory in scratch area
> 
> :::::: TO: Pasha Tatashin <pasha.tatashin@soleen.com>
> :::::: CC: Andrew Morton <akpm@linux-foundation.org>
> 
> -- 
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki

-- 
Sincerely yours,
Mike.