On 2021-08-10 19:16:19 [+0200], Thomas Gleixner wrote: > On Tue, Aug 10 2021 at 15:54, Sebastian Andrzej Siewior wrote: > > On 2021-08-10 14:41:25 [+0100], Valentin Schneider wrote: > >> [ 4.172817] BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:35 > > > > Would it work to allocate the memory upfront and invoke the HP callback > > via smp_function_call()? > > Huch? If the memory is allocated during the prepare stage then the > actual hotplug callback can just use it. So what's the SMP function call > for? You allocate the memory per-node (based on cpuid id) and you figure that out on the target CPU. That is the smp-function call for unless there another way to gather that information. That is done in arm_pmu_acpi_find_alloc_pmu() -> read_cpuid_id() > Thanks, > > tglx Sebastian
