On Mon, Oct 30, 2017 at 04:22:44PM -0400, Steven Rostedt wrote: > On Wed, 25 Oct 2017 14:49:34 +1100 > "Tobin C. Harding" <[email protected]> wrote: > > > > First, the static_key stuff. > > > > DEFINE_STATIC_KEY_TRUE(no_ptr_secret) : Doesn't sleep, just a > > declaration. > > > > if (static_branch_unlikely(&no_ptr_secret)) {} : Doesn't sleep, just > > some assembler to jump to returning true or false. > > > > static_branch_disable(&no_ptr_secret) : Doesn't sleep, just atomic read > > and set and maybe a WARN_ONCE. > > How quickly do you need static_branch_disable() executed? You could > always pass the work off to a worker thread (that can schedule). > > random_ready_callback -> initiates worker thread -> enables the static branch > > -- Steve
thanks Steve, v8 and onward does away with the static branch and uses a global boolean instead. thanks, Tobin.
