Subject: Re: linux-next: manual merge of the rcu tree with the ftrace tree

From: Sebastian Andrzej Siewior <[email-masked]>
Date: Tue, 18 Nov 2025 08:35:08 +0100

On 2025-11-14 10:31:45 [-0800], Yonghong Song wrote:
> > I believe that migration needs to be disabled at this point, but I am
> > again adding Yonghong on CC for his perspective.
> 
> Yes, migration needs to be disabled for rt kernel in order to let
> bpf program running properly.

Why is disabling migration special in regard to RT kernels vs !RT?
Why do we need to disable migration given that bpf_prog_run_array()
already does that? Is there a different entry point? 
My point why is it required to disable migration on trace-point entry
for BPF given that the BPF-entry already does so.

Sebastian