19 Aug
2021
19 Aug
'21
9:09 p.m.
On Mon, 09 Aug 2021 11:20:32 +0200 gregkh@linuxfoundation.org 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@vger.kernel.org.
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