Thanks. Unfortunately exporting cpuset_cpus_allowed() is not enough. When CONFIG_CPUSETS is _not_ defined, the function is inline to return task_cpu_possible_mask(). On arm64 the latter checks the static key arm64_mismatched_32bit_el0, and thus this symbol must be exported too. I wonder whether it would be better to avoid inlining cpuset_cpus_allowed() in this case. Br, Fred On Fri, Jun 7, 2024 at 5:29 PM Tejun Heo <tj@xxxxxxxxxx> wrote: > > On Thu, Jun 06, 2024 at 11:45:37AM -0400, Waiman Long wrote: > > > > On 6/6/24 11:10, Fred Griffoul wrote: > > > A subsequent patch calls cpuset_cpus_allowed() in the vfio driver pci > > > code. Export the symbol to be able to build the vfio driver as a kernel > > > module. > > > > > > Signed-off-by: Fred Griffoul <fgriffo@xxxxxxxxxxxx> > > > Reported-by: kernel test robot <lkp@xxxxxxxxx> > > > Closes: https://lore.kernel.org/oe-kbuild-all/202406060731.L3NSR1Hy-lkp@xxxxxxxxx/ > > > --- > > > kernel/cgroup/cpuset.c | 1 + > > > 1 file changed, 1 insertion(+) > > > > > > diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c > > > index 4237c8748715..9fd56222aa4b 100644 > > > --- a/kernel/cgroup/cpuset.c > > > +++ b/kernel/cgroup/cpuset.c > > > @@ -4764,6 +4764,7 @@ void cpuset_cpus_allowed(struct task_struct *tsk, struct cpumask *pmask) > > > rcu_read_unlock(); > > > spin_unlock_irqrestore(&callback_lock, flags); > > > } > > > +EXPORT_SYMBOL_GPL(cpuset_cpus_allowed); > > > /** > > > * cpuset_cpus_allowed_fallback - final fallback before complete catastrophe. > > > > LGTM > > > > Acked-by: Waiman Long <longman@xxxxxxxxxx> > > Acked-by: Tejun Heo <tj@xxxxxxxxxx> > > If more convenient, please feel free to route the patch with the rest of the > series. If you want it applied to the cgroup tree, please let me know. > > Thanks. > > -- > tejun
