Re: [PATCH 1/1] rcu/tree: Drop the lock before entering to page allocator

[Sebastian Andrzej Siewior]

On 2020-07-16 11:19:13 [+0200], Uladzislau Rezki wrote:
> Sebastian, could you please confirm that if that patch that is in
> question fixes it?
> 
> It would be appreciated!

So that preempt disable should in terms any warnings. However I don't
think that it is strictly needed and from scheduling point of view you
forbid a CPU migration which might be good otherwise.
Also if interrupts and everything is enabled then someone else might
invoke kfree_rcu() from BH context for instance.

Sebastian