On Sun, May 22, 2016 at 10:43:08AM +0200, Manfred Spraul wrote: > How would we handle mixed spin_lock()/mutex_lock() code? > For the IPC code, I would like to replace the outer lock with a mutex. > The code only uses spinlocks, because at the time it was written, the mutex > code didn't contain a busy wait. > With a mutex, the code would become simpler (all the > lock/unlock/kmalloc/relock parts could be removed). > > The result would be something like: > > mutex_lock(A) spin_lock(B) > spin_unlock_wait(B) if (!mutex_is_locked(A)) > do_something() do_something() >
Should work similarly, but we'll have to audit mutex for these same issues. I'll put it on todo.
