On Mon, 09 Aug 2021 11:20:32 +0200 <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > The patch below does not apply to the 5.10-stable tree. > If someone wants it applied there, or to any other stable or longterm > tree, then please email the backport, including the original git commit > id to <stable@xxxxxxxxxxxxxxx>. > Crap. Mathieu, seems that the "slow down 10x" patch was able to be backported to 5.10, where as this patch was not. Reason being is that start_poll_synchronize_rcu() was added in 5.13. This means because the other patch was able to be backported without this patch, we just slowed down disabling all events! Which may be a surprise to some people not expecting a stable branch from having such a big performance regression :-/ -- Steve
