Messages in this thread | | | Subject | Re: [PATCH 02/10] rcu: Move rcu_preempt_depth_set() to rcupdate.h | From | Alan Huang <> | Date | Mon, 1 Apr 2024 19:57:40 +0800 |
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2024年4月1日 19:40,Alan Huang <mmpgouride@gmail.com> wrote: > > 2024年4月1日 00:16,Lai Jiangshan <jiangshanlai@gmail.com> wrote: >> >> On Sun, Mar 31, 2024 at 7:10 PM Joel Fernandes <joel@joelfernandes.org> wrote: >>> >>> >>> >>>> On Mar 28, 2024, at 1:20 PM, Lai Jiangshan <jiangshanlai@gmail.com> wrote: >>>> >>>> From: Lai Jiangshan <jiangshan.ljs@antgroup.com> >>>> >>>> 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. > > But ‘current’ still needs to be expanded at last, it seems to me that it only affects > the including order of the header files? > > Or what am I missing?
Get the missing part: if the user don’t need to use rcu_preempt_depth() and rcu_preempt_depth_set() but other parts of rcupdate.h, then the two has to be defined as a macro to avoid including linux/sched.h.
Sorry for the bother.
> >> >> 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. >> >> Thanks >> Lai
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