On Mon, 19 May 2014 08:13:16 -0700 Davidlohr Bueso <davidlohr@xxxxxx> wrote:
> > Presumably a result of commit fe2038c57c03 ("rwsem: Support optimistic
> > spinning").
>
> If CONFIG_SMP, we add two new fields to the rwsem structure
> (include/linux/rwsem.h) and likewise we update the
> __RWSEM_INITIALIZER(name) macro. Afaict the only way to trigger
> something like that is to be using the spinlock variant
> (rwsem-spinlock.h).
>
> The fix for that would be:
>
> diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
> index 3e108f1..091d993 100644
> --- a/include/linux/rwsem.h
> +++ b/include/linux/rwsem.h
> @@ -64,7 +64,7 @@ static inline int rwsem_is_locked(struct rw_semaphore *sem)
> # define __RWSEM_DEP_MAP_INIT(lockname)
> #endif
>
> -#ifdef CONFIG_SMP
> +#if defined(CONFIG_SMP) && defined(CONFIG_RWSEM_XCHGADD_ALGORITHM)
> #define __RWSEM_INITIALIZER(name) \
> { RWSEM_UNLOCKED_VALUE, \
> __RAW_SPIN_LOCK_UNLOCKED(name.wait_lock), \
that squishes the warnings for me.
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