On Wed, May 13, 2015 at 12:31:57PM +0200, Borislav Petkov wrote:
> On Tue, May 12, 2015 at 02:18:41PM -0700, Paul E. McKenney wrote:
> > From: "Paul E. McKenney" <[email protected]>
> >
> > Because mce is arch-specific x86 code, there is little or no
> > performance benefit of using rcu_dereference_index_check() over using
> > smp_load_acquire(). It also turns out that mce is the only place that
> > array-index-based RCU is used, and it would be convenient to drop
> > this portion of the RCU API.
> >
> > This patch therefore changes rcu_dereference_index_check() uses to
> > smp_load_acquire(), but keeping the lockdep diagnostics, and also
> > changes rcu_access_index() uses to READ_ONCE().
> >
> > Signed-off-by: Paul E. McKenney <[email protected]>
> > Cc: [email protected]
> > Cc: Tony Luck <[email protected]>
> > Cc: Borislav Petkov <[email protected]>
>
> Looks good to me.
>
> If it is easier for you carrying it in your tree:
>
> Acked-by: Borislav Petkov <[email protected]>
>
> Otherwise, let me know.
Thank you, I have applied your Acked-by. Probably easier for me
to carry this change, given that it needs to be applied before the
later patches that remove array-index support from RCU.
Thanx, Paul
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
