On Wed, May 16, 2018 at 12:48:30PM +0200, Oleg Nesterov wrote:
> > +static inline bool is_rwsem_owner_spinnable(struct task_struct *owner)
> > {
> > - return owner && owner != RWSEM_READER_OWNED;
> > + return !((unsigned long)owner & RWSEM_ANONYMOUSLY_OWNED);
> > }
>
> Perhaps you should add __attribute__(aligned) to struct rw_semaphore then...
>
> I don't think it is really needed, but see the comment under struct
> address_space.
Luckily we just dropped CRIS support, but yeah, who knows if some other
dodgy arch also doesn't properly align things.
>From a quick test, m68k is the only odd one, it seems to align pointers
on 2 bytes.
