On 06/27/2014 07:41 AM, Grant Likely wrote: > On Thu, 26 Jun 2014 15:01:49 -0500, Nathan Fontenot <nfont@xxxxxxxxxxxxxx> wrote: >> On 06/25/2014 03:24 PM, Grant Likely wrote: >>> On Tue, 24 Jun 2014 15:10:55 -0500, Nathan Fontenot <nfont@xxxxxxxxxxxxxx> wrote: >>>>>> heh! I have often thought about adding reference counting to device tree >>>>>> properties. >>>>> >>>>> You horrible, horrible man. >>>> >>>> Yes. I are evil :) >>>> >>>> After looking again the work needed to add reference counts to properties >>>> would be huge. The few properties I am concerned with are specific to powerpc >>>> so perhaps just adding an arch specific lock around updating those >>>> properties would work. >>> >>> Which code/properties? I'd like to have a look myself. >> >> /ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory >> >> The property is updated in >> arch/powerpc/platforms/pseries/hotplug-memory.c:pseries_update_drconf_memory() > > Specifically, what do you need for the locking? Are you wanting to hold > off additional changes while that function is executing? Pantelis is > adding a mutex for device tree writers. Holding that mutex would prevent > any changes from happening in the tree without affecting readers. Would > that be sufficient? That would work. -Nathan -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
