On Sun, 25 Apr 2021 05:56:53 +0000 Ruifeng Wang <[email protected]> wrote:
> Instead of polling for tail to be updated, use wfe instruction. > > Signed-off-by: Gavin Hu <[email protected]> > Signed-off-by: Ruifeng Wang <[email protected]> > Reviewed-by: Steve Capper <[email protected]> > Reviewed-by: Ola Liljedahl <[email protected]> > Reviewed-by: Honnappa Nagarahalli <[email protected]> > Acked-by: Konstantin Ananyev <[email protected]> Looks ok to me, but it does raise an interesting question. Shouldn't the original code have been using atomic load to look at ht->tail. This another place where "volatile considered harmful" applies.
