On Tue, Aug 09, 2016 at 02:00:00PM -0400, Waiman Long wrote: > >Alternative might be to use the LSB of mutex::owner, but that's going to > >be somewhat icky too. > > I was thinking about doing that. However, the owner field is used in quite a > number of places. It may be a bit risky to change all of them.
Agreed. > >I'm not sure the 32bit platforms are going to be excited about growing > >struct mutex... > > Or we can make this a 64-bit architecture specific change if the increase in > mutex size is a real concern. Actually, we don't need to use a list_head > structure for wait_list. It can be just a pointer to mutex_waiter that has > the list_head structure. This can save a pointer from the structure. Just grow the thing, we can poke at it later if we get complaints.
