On 2016-05-19 14:21:48 [+0200], Peter Zijlstra wrote:
> > +static void futex_populate_hash(unsigned int hash_bits)
> > +{
…
> > + raw_spin_lock(&mm->futex_hash.lock);
> > + /* We might have raced with another task allocating the hash. */
> > + if (!mm->futex_hash.hash) {
> > + mm->futex_hash.hash_bits = hash_bits;
> > + /*
> > + * Ensure that the above is visible before we store
> > + * the pointer.
> > + */
> > + smp_wmb(); /* (A0) Pairs with (B) */
> > + mm->futex_hash.hash = hb;
>
> smp_store_release(&mm->futex_hash.hash, hb); ?
just to be clear: You suggest to use "smp_store_release()" instead
smp_wmb() followed by the assignment?
Sebastian
