On Wed, 21 Jan 2026 07:50:16 +0800
kernel test robot [off-list ref] wrote:

Hi Ryan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master v6.19-rc6 next-20260119]
[cannot apply to tip/sched/core kees/for-next/hardening kees/for-next/execve]
[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/Ryan-Roberts/randomize_kstack-Maintain-kstack_offset-per-task/20260119-210329
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20260119130122.1283821-4-ryan.roberts%40arm.com
patch subject: [PATCH v4 3/3] randomize_kstack: Unify random source across arches
config: x86_64-allmodconfig (https://download.01.org/0day-ci/archive/20260121/202601210752.6Nsv9et9-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/20260121/202601210752.6Nsv9et9-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 [off-list ref]
| Closes: https://lore.kernel.org/oe-kbuild-all/202601210752.6Nsv9et9-lkp@intel.com/ (local)

All warnings (new ones prefixed by >>):

quoted

quoted

vmlinux.o: warning: objtool: do_syscall_64+0x2c: call to preempt_count_add() leaves .noinstr.text section
vmlinux.o: warning: objtool: __do_fast_syscall_32+0x3d: call to preempt_count_add() leaves .noinstr.text section  

When CONFIG_DEBUG_PREEMPT or CONFIG_TRACE_PREEMP_TOGGLE is set
the preempt_count_[en|dis]able() calls inside [put|get]_cpu_var()
become real functions.

Maybe __preempt_count_[inc|dec]() can be called (with this_cpu_ptr()).

	David