On Wed, 21 Jan 2026 07:50:16 +0800 kernel test robot <[email protected]> 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/[email protected]/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/[email protected]/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 <[email protected]> > | Closes: > https://lore.kernel.org/oe-kbuild-all/[email protected]/ > > All warnings (new ones prefixed by >>): > > >> 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
