On 02/06/21 17:47, Will Deacon wrote: > Asymmetric systems may not offer the same level of userspace ISA support > across all CPUs, meaning that some applications cannot be executed by > some CPUs. As a concrete example, upcoming arm64 big.LITTLE designs do > not feature support for 32-bit applications on both clusters. > > Modify guarantee_online_cpus() to take task_cpu_possible_mask() into > account when trying to find a suitable set of online CPUs for a given > task. This will avoid passing an invalid mask to set_cpus_allowed_ptr() > during ->attach() and will subsequently allow the cpuset hierarchy to be > taken into account when forcefully overriding the affinity mask for a > task which requires migration to a compatible CPU. > > Cc: Li Zefan <lizefan@xxxxxxxxxx> > Cc: Tejun Heo <tj@xxxxxxxxxx> > Cc: Johannes Weiner <hannes@xxxxxxxxxxx> > Signed-off-by: Will Deacon <will@xxxxxxxxxx> Reviewed-by: Valentin Schneider <Valentin.Schneider@xxxxxxx>
