Quoting Koenig, Christian (2019-08-14 18:58:32)
> Am 14.08.19 um 19:48 schrieb Chris Wilson:
> > Quoting Chris Wilson (2019-08-14 18:38:20)
> >> Quoting Chris Wilson (2019-08-14 18:22:53)
> >>> Quoting Chris Wilson (2019-08-14 18:06:18)
> Quoting Chris Wilson (2019-08-14 17:42:48)
> > Quot
Am 14.08.19 um 19:48 schrieb Chris Wilson:
> Quoting Chris Wilson (2019-08-14 18:38:20)
>> Quoting Chris Wilson (2019-08-14 18:22:53)
>>> Quoting Chris Wilson (2019-08-14 18:06:18)
Quoting Chris Wilson (2019-08-14 17:42:48)
> Quoting Daniel Vetter (2019-08-14 16:39:08)
> + }
On Wed, Aug 14, 2019 at 06:20:28PM +0100, Chris Wilson wrote:
> Quoting Daniel Vetter (2019-08-14 18:06:26)
> > On Wed, Aug 14, 2019 at 05:42:48PM +0100, Chris Wilson wrote:
> > > Quoting Daniel Vetter (2019-08-14 16:39:08)
> [snip]
> > > > > > > if (old)
> > > > > > > - old-
Quoting Chris Wilson (2019-08-14 18:38:20)
> Quoting Chris Wilson (2019-08-14 18:22:53)
> > Quoting Chris Wilson (2019-08-14 18:06:18)
> > > Quoting Chris Wilson (2019-08-14 17:42:48)
> > > > Quoting Daniel Vetter (2019-08-14 16:39:08)
> > > > > > > > + } while (rcu_access_pointer(obj->fence_
Quoting Chris Wilson (2019-08-14 18:22:53)
> Quoting Chris Wilson (2019-08-14 18:06:18)
> > Quoting Chris Wilson (2019-08-14 17:42:48)
> > > Quoting Daniel Vetter (2019-08-14 16:39:08)
> > > > > > > + } while (rcu_access_pointer(obj->fence_excl) != *excl);
> > > >
> > > > What if someone is
Quoting Chris Wilson (2019-08-14 18:06:18)
> Quoting Chris Wilson (2019-08-14 17:42:48)
> > Quoting Daniel Vetter (2019-08-14 16:39:08)
> > > > > > + } while (rcu_access_pointer(obj->fence_excl) != *excl);
> > >
> > > What if someone is real fast (like really real fast) and recycles the
> >
Quoting Daniel Vetter (2019-08-14 18:06:26)
> On Wed, Aug 14, 2019 at 05:42:48PM +0100, Chris Wilson wrote:
> > Quoting Daniel Vetter (2019-08-14 16:39:08)
[snip]
> > > > > > if (old)
> > > > > > - old->shared_count = 0;
> > > > > > - write_seqcount_end(&obj->seq);
> >
Quoting Chris Wilson (2019-08-14 17:42:48)
> Quoting Daniel Vetter (2019-08-14 16:39:08)
> > > > > + } while (rcu_access_pointer(obj->fence_excl) != *excl);
> >
> > What if someone is real fast (like really real fast) and recycles the
> > exclusive fence so you read the same pointer twice, b
On Wed, Aug 14, 2019 at 05:42:48PM +0100, Chris Wilson wrote:
> Quoting Daniel Vetter (2019-08-14 16:39:08)
> > Sorry I burried myself in some other stuff ...
> >
> > On Sat, Aug 10, 2019 at 12:51:00PM +0200, Christian König wrote:
> > > Am 07.08.19 um 16:17 schrieb Chris Wilson:
> > > > Quoting C
Quoting Daniel Vetter (2019-08-14 16:39:08)
> Sorry I burried myself in some other stuff ...
>
> On Sat, Aug 10, 2019 at 12:51:00PM +0200, Christian König wrote:
> > Am 07.08.19 um 16:17 schrieb Chris Wilson:
> > > Quoting Christian König (2019-08-07 14:53:12)
> > > > The only remaining use for th
Sorry I burried myself in some other stuff ...
On Sat, Aug 10, 2019 at 12:51:00PM +0200, Christian König wrote:
> Am 07.08.19 um 16:17 schrieb Chris Wilson:
> > Quoting Christian König (2019-08-07 14:53:12)
> > > The only remaining use for this is to protect against setting a new
> > > exclusive
Am 07.08.19 um 16:17 schrieb Chris Wilson:
Quoting Christian König (2019-08-07 14:53:12)
The only remaining use for this is to protect against setting a new exclusive
fence while we grab both exclusive and shared. That can also be archived by
looking if the exclusive fence has changed or not aft
Quoting Christian König (2019-08-07 14:53:12)
> The only remaining use for this is to protect against setting a new exclusive
> fence while we grab both exclusive and shared. That can also be archived by
> looking if the exclusive fence has changed or not after completing the
> operation.
>
> v2:
The only remaining use for this is to protect against setting a new exclusive
fence while we grab both exclusive and shared. That can also be archived by
looking if the exclusive fence has changed or not after completing the
operation.
v2: switch setting excl fence to rcu_assign_pointer
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