[RESEND PATCH v2 1/2] ftrace: disable preemption between ftrace_test_recursion_trylock/unlock()

[Miroslav Benes]

> > Side note... the comment will eventually conflict with peterz's 
> > https://lore.kernel.org/all/20210929152429.125997206@infradead.org/.
> 
> Steven, would you like to share your opinion on this patch?
> 
> If klp_synchronize_transition() will be removed anyway, the comments
> will be meaningless and we can just drop it :-P

The comment will still be needed in some form. We will handle it depending 
on what gets merged first. peterz's patches are not ready yet.

Miroslav