Init task invokes smp_ops->setup_cpu() from smp_cpus_done(). Init task can run on any online CPU at this point, but the setup_cpu() callback requires to be invoked on the boot CPU. This is achieved by temporarily setting the affinity of the calling user space thread to the requested CPU and reset it to the original affinity afterwards. That's racy vs. CPU hotplug and concurrent affinity settings for that thread resulting in code executing on the wrong CPU and overwriting the new affinity setting. That's actually not a problem in this context as neither CPU hotplug nor affinity settings can happen, but the access to task_struct::cpus_allowed is about to restricted. Replace it with a call to work_on_cpu_safe() which achieves the same result. Signed-off-by: Thomas Gleixner Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: linuxppc-dev@lists.ozlabs.org --- arch/powerpc/kernel/smp.c | 26 +++++++++++--------------- 1 file changed, 11 insertions(+), 15 deletions(-) --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -787,24 +787,21 @@ static struct sched_domain_topology_leve { NULL, }, }; -void __init smp_cpus_done(unsigned int max_cpus) +static __init long smp_setup_cpu_workfn(void *data __always_unused) { - cpumask_var_t old_mask; + smp_ops->setup_cpu(boot_cpuid); + return 0; +} - /* We want the setup_cpu() here to be called from CPU 0, but our - * init thread may have been "borrowed" by another CPU in the meantime - * se we pin us down to CPU 0 for a short while +void __init smp_cpus_done(unsigned int max_cpus) +{ + /* + * We want the setup_cpu() here to be called on the boot CPU, but + * init might run on any CPU, so make sure it's invoked on the boot + * CPU. */ - alloc_cpumask_var(&old_mask, GFP_NOWAIT); - cpumask_copy(old_mask, ¤t->cpus_allowed); - set_cpus_allowed_ptr(current, cpumask_of(boot_cpuid)); - if (smp_ops && smp_ops->setup_cpu) - smp_ops->setup_cpu(boot_cpuid); - - set_cpus_allowed_ptr(current, old_mask); - - free_cpumask_var(old_mask); + work_on_cpu_safe(boot_cpuid, smp_setup_cpu_workfn, NULL); if (smp_ops && smp_ops->bringup_done) smp_ops->bringup_done(); @@ -812,7 +809,6 @@ void __init smp_cpus_done(unsigned int m dump_numa_cpu_topology(); set_sched_topology(powerpc_topology); - } #ifdef CONFIG_HOTPLUG_CPU