Re: [PATCH -next 1/8] rcu: Fix rcu_read_unlock() deadloop due to softirq

[Frederic Weisbecker]

Le Wed, Jan 07, 2026 at 10:35:44PM -0500, Joel Fernandes a écrit :
> > 
> > By the way, when I last tried to do it from rcu_qs, it was not fixing the original bug with the IRQ work recursion.
> > 
> > I found that it was always resetting the flag. But probably it is not even the right place to do it in the first place.
> 
> I think we need to reset the flag in rcu_report_exp_rdp() as well if exp_hint
> is set and we reported exp qs.

To avoid needlessly reaching the rcu_read_unlock() slowpath whenever the exp QS has
already been reported, yes indeed.

>  I am working on a series to cover all cases and will send RFC soon. However this patch we are 
> reviewing can go in for this merge window and the rest I am preparing (for
> further improvement) for the next merge window, if that sounds good.

Ok.

-- 
Frederic Weisbecker
SUSE Labs