On Sat, Oct 10, 2020 at 1:55 AM Xianting Tian <tian.xianting@xxxxxxx> wrote: > > In architecture like powerpc, we can have cpus without any local memory > attached to it. In such cases the node does not have real memory. > > Use local_memory_node(), which is guaranteed to have memory. > local_memory_node is a noop in other architectures that does not support > memoryless nodes. ... > /* Have map->numa_node, but choose node of redirect target CPU */ > - numa = cpu_to_node(cpu); > + numa = local_memory_node(cpu_to_node(cpu)); There are so many calls to cpu_to_node() throughout the kernel. Are you going to convert all of them one patch at a time to the above sequence? Why not do this CONFIG_HAVE_MEMORYLESS_NODES in cpu_to_node() instead? and save the churn.
