RE: [PATCH] device-dax: use fallback nid when numa_node is invalid

[Justin He <Justin.He@arm.com>]

Hi David

> -----Original Message-----
> From: David Hildenbrand <david@redhat.com>
> Sent: Thursday, July 29, 2021 3:59 PM
> To: Justin He <Justin.He@arm.com>; Dan Williams <dan.j.williams@intel.com>;
> Vishal Verma <vishal.l.verma@intel.com>; Dave Jiang <dave.jiang@intel.com>
> Cc: nvdimm@lists.linux.dev; linux-kernel@vger.kernel.org; nd <nd@arm.com>
> Subject: Re: [PATCH] device-dax: use fallback nid when numa_node is
> invalid
> 
> Hi Justin,
> 
> >>>
> >>
> >> Note that this patch conflicts with:
> >>
> >> https://lkml.kernel.org/r/20210723125210.29987-7-david@redhat.com
> >>
> >> But nothing fundamental. Determining a single NID is similar to how I'm
> >> handling it for ACPI:
> >>
> >> https://lkml.kernel.org/r/20210723125210.29987-6-david@redhat.com
> >>
> >
> > Okay, got it. Thanks for the reminder.
> > Seems my patch is not useful after your patch.
> >
> 
> I think your patch still makes sense. With
> 
> https://lore.kernel.org/linux-acpi/20210723125210.29987-7-
> david@redhat.com/
> 
> We'd have to detect the node id in the first loop instead.

Ok, I got your point. I will do that in v2.

Btw, sorry for commenting there about your patch 06 since I didn't
subscribe lkml via this mailbox.

+	for (i = 0; i < dev_dax->nr_range; i++) {
+		struct range range;
+
+		rc = dax_kmem_range(dev_dax, i, &range);
+		if (rc) {
+			dev_info(dev, "mapping%d: %#llx-%#llx too small after alignment\n",
+					i, range.start, range.end);
+			continue;
+		}
+		total_len += range_len(&range);
+	}
You add an additional loop to get the total_len.
I wonder is it independent on 2nd loop?
If yes, why not merge the 2 loops into one?
Sorry if this question is too simple, I don't know too much
about the background of your patch.


--
Cheers,
Justin (Jia He)