tree: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next-test head: 5811244192fc4e18c001c69300044c2acf30bd91 commit: 032b7f08932c9b212952d6d585e45b2941b3e8be [129/159] powerpc/64s/radix: serialize_against_pte_lookup IPIs trim mm_cpumask config: powerpc-randconfig-r026-20210209 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=032b7f08932c9b212952d6d585e45b2941b3e8be git remote add powerpc https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git git fetch --no-tags powerpc next-test git checkout 032b7f08932c9b212952d6d585e45b2941b3e8be # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <l...@intel.com>
All warnings (new ones prefixed by >>):
>> arch/powerpc/mm/book3s64/radix_tlb.c:646:6: warning: no previous prototype
>> for function 'exit_lazy_flush_tlb' [-Wmissing-prototypes]
void exit_lazy_flush_tlb(struct mm_struct *mm, bool always_flush)
^
arch/powerpc/mm/book3s64/radix_tlb.c:646:1: note: declare 'static' if the
function is not intended to be used outside of this translation unit
void exit_lazy_flush_tlb(struct mm_struct *mm, bool always_flush)
^
static
1 warning generated.
vim +/exit_lazy_flush_tlb +646 arch/powerpc/mm/book3s64/radix_tlb.c
641
642 /*
643 * If always_flush is true, then flush even if this CPU can't be removed
644 * from mm_cpumask.
645 */
> 646 void exit_lazy_flush_tlb(struct mm_struct *mm, bool always_flush)
647 {
648 unsigned long pid = mm->context.id;
649 int cpu = smp_processor_id();
650
651 /*
652 * A kthread could have done a mmget_not_zero() after the
flushing CPU
653 * checked mm_cpumask, and be in the process of kthread_use_mm
when
654 * interrupted here. In that case, current->mm will be set to
mm,
655 * because kthread_use_mm() setting ->mm and switching to the
mm is
656 * done with interrupts off.
657 */
658 if (current->mm == mm)
659 goto out;
660
661 if (current->active_mm == mm) {
662 WARN_ON_ONCE(current->mm != NULL);
663 /* Is a kernel thread and is using mm as the lazy tlb */
664 mmgrab(&init_mm);
665 current->active_mm = &init_mm;
666 switch_mm_irqs_off(mm, &init_mm, current);
667 mmdrop(mm);
668 }
669
670 /*
671 * This IPI may be initiated from any source including those not
672 * running the mm, so there may be a racing IPI that comes after
673 * this one which finds the cpumask already clear. Check and
avoid
674 * underflowing the active_cpus count in that case. The race
should
675 * not otherwise be a problem, but the TLB must be flushed
because
676 * that's what the caller expects.
677 */
678 if (cpumask_test_cpu(cpu, mm_cpumask(mm))) {
679 atomic_dec(&mm->context.active_cpus);
680 cpumask_clear_cpu(cpu, mm_cpumask(mm));
681 always_flush = true;
682 }
683
684 out:
685 if (always_flush)
686 _tlbiel_pid(pid, RIC_FLUSH_ALL);
687 }
688
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
.config.gz
Description: application/gzip
