Re: [PATCH v9 3/7] srcu: Fix invoke_rcu_callbacks() segcb length adjustment

Frederic Weisbecker
2020-11-03T14:47:26Z

On Tue, Nov 03, 2020 at 09:25:59AM -0500, Joel Fernandes (Google) wrote:
> With earlier patches, the negative counting of the unsegmented list
> cannot be used to adjust the segmented one. To fix this, sample the
> unsegmented length in advance, and use it after CB execution to adjust
> the segmented list's length.
>
> Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
> Suggested-by: Frederic Weisbecker <frederic@kernel.org>
> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>

This breaks bisection, you need to either fix up the previous patch
by adding this diff inside or better yet: expand what you did
in "rcu/tree: Make rcu_do_batch count how many callbacks were executed"
to also handle srcu before introducing the segcb count.

Thanks.