> On Mar 31, 2024, at 9:46 PM, Lai Jiangshan <jiangshanlai@xxxxxxxxx> wrote: > > On Sun, Mar 31, 2024 at 7:10 PM Joel Fernandes <joel@xxxxxxxxxxxxxxxxx> wrote: >> >> >> >>>> On Mar 28, 2024, at 1:20 PM, Lai Jiangshan <jiangshanlai@xxxxxxxxx> wrote: >>> >>> From: Lai Jiangshan <jiangshan.ljs@xxxxxxxxxxxx> >>> >>> Prepare for arch-specific-defined rcu_preempt_depth_set(). >>> >>> No functionality change intended, but it has to be defined as a macro >>> as rcupdate.h is a very low level header included from areas that don't >>> even know about the task struct "current". >> >> Sorry I did not follow changelog. If some rcupdate.h includers do not know >> about task_struct, how does adding a macro that uses current help? >> > > Hello > > This is how macro works and it expands blindly based on tokens on the > usage-sites. > > And rcu_preempt_depth() & rcu_preempt_depth_set() are not universally > used wrappers, the user can simply also include linux/sched.h to make > they work. Oh I see, so by hiding it in a macro, the code remains unexpanded. That makes sense.. Thanks. > > Thanks > Lai
