Re: [PATCH tip/core/rcu 2/2] documentation: Record reason for rcu_head two-byte alignment

From: Paul E. McKenney
Date: Tue Aug 23 2016 - 15:52:20 EST


On Tue, Aug 23, 2016 at 04:30:47PM +0200, Geert Uytterhoeven wrote:
> On Tue, Aug 23, 2016 at 4:23 PM, Paul E. McKenney
> <paulmck@xxxxxxxxxxxxxxxxxx> wrote:
> > commit 89d39c83d193733ed5fff1c480cd42c9de1da404
> > Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
> > Date: Tue Aug 23 06:51:47 2016 -0700
> >
> > rcu: Tighted up __call_rcu() rcu_head alignment check
> >
> > Commit 720abae3d68ae ("rcu: force alignment on struct
> > callback_head/rcu_head") forced the rcu_head (AKA callback_head)
> > structure's alignment to pointer size, that is, to 4-byte boundaries on
> > 32-bit systems and to 8-byte boundaries on 64-bit systems. This
> > commit therefore checks for this same alignment in __call_rcu(),
> > which used to check for two-byte alignment.
> >
> > Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
> > Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> > Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
>
> Tested-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>

Thank you! I have upgraded your Cc to Tested-by. ;-)

Thanx, Paul