Re: [Xen-devel] [PATCH 2/7] common: avoid atomic read-modify-write accesses in map_vcpu_info()

[Julien Grall <julien.grall@xxxxxxx>]

Hi Jan,

On 3/12/19 9:30 AM, Jan Beulich wrote:
> > > > On 11.03.19 at 18:53, <julien.grall@xxxxxxx> wrote:
> > Hi,
> >
> > On 11/03/2019 16:50, Andrew Cooper wrote:
> > > On 11/03/2019 16:48, Jan Beulich wrote:
> > > > There's no need to set the evtchn_pending_sel bits one by one. Simply
> > > > write full words with all ones.
> > > >
> > > > For Arm this requires extending write_atomic() to also handle 64-bit
> > > > values; for symmetry read_atomic() gets adjusted as well.
> > > >
> > > > Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> > > Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> > >
> > > (I'll leave the ARM assembly to Julien to check over)
> > Reviewed-by: Julien Grall <julien.grall@xxxxxxx>
> >
> > I can queue this series in my next branch once it is fully acked.
> I was meaning to apply right away whatever initial parts of it are
> fully acked, as this isn't a major change, and it doesn't have a
> significant risk of conflicts with potential last minute changes for
> 4.12.
This works for me.

Cheers,

--
Julien Grall

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