Ivo Sieben <meltedpianoman@xxxxxxxxx> writes: > Check the waitqueue task list to be non empty before entering the critical > section. This prevents locking the spin lock needlessly in case the queue > was empty, and therefor also prevent scheduling overhead on a PREEMPT_RT > system. > > Signed-off-by: Ivo Sieben <meltedpianoman@xxxxxxxxx> > --- > > REPOST: > Request for comments: > - Does this make any sense? Looks good to me. Avoiding any spinlock is good. I don't even think you need "careful", if you miss an update it was just as it happened a little later. -Andi -- ak@xxxxxxxxxxxxxxx -- Speaking for myself only -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
