On 2020-05-10 20:48, Ming Lei wrote: > On Sun, May 10, 2020 at 08:20:24PM -0700, Bart Van Assche wrote: >> What I meant is to freeze a request queue temporarily. > > But what is your motivation to freeze queue temporarily? To achieve a solution for CPU hotplugging that is much simpler than this patch series, requires less code and hence is easier to test, debug and maintain. Thanks, Bart.