The patch titled
Subject: mm/fake-numa: handle cases with no SRAT info
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-fake-numa-handle-cases-with-no-srat-info.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-fake-numa-handle-cases-with-no-srat-info.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Bruno Faccini <bfaccini@xxxxxxxxxx>
Subject: mm/fake-numa: handle cases with no SRAT info
Date: Mon, 27 Jan 2025 09:16:23 -0800
Handle more gracefully cases where no SRAT information is available, like
in VMs with no Numa support, and allow fake-numa configuration to complete
successfully in these cases
Link: https://lkml.kernel.org/r/20250127171623.1523171-1-bfaccini@xxxxxxxxxx
Fixes: 63db8170bf34 (â??mm/fake-numa: allow later numa node hotplugâ??)
Signed-off-by: Bruno Faccini <bfaccini@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Hyeonggon Yoo <hyeonggon.yoo@xxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Cc: "Mike Rapoport (IBM)" <rppt@xxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/acpi/numa/srat.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
--- a/drivers/acpi/numa/srat.c~mm-fake-numa-handle-cases-with-no-srat-info
+++ a/drivers/acpi/numa/srat.c
@@ -95,9 +95,13 @@ int __init fix_pxm_node_maps(int max_nid
int i, j, index = -1, count = 0;
nodemask_t nodes_to_enable;
- if (numa_off || srat_disabled())
+ if (numa_off)
return -1;
+ /* no or incomplete node/PXM mapping set, nothing to do */
+ if (srat_disabled())
+ return 0;
+
/* find fake nodes PXM mapping */
for (i = 0; i < MAX_NUMNODES; i++) {
if (node_to_pxm_map[i] != PXM_INVAL) {
@@ -117,6 +121,11 @@ int __init fix_pxm_node_maps(int max_nid
}
}
}
+ if (index == -1) {
+ pr_debug("No node/PXM mapping has been set\n");
+ /* nothing more to be done */
+ return 0;
+ }
if (WARN(index != max_nid, "%d max nid when expected %d\n",
index, max_nid))
return -1;
_
Patches currently in -mm which might be from bfaccini@xxxxxxxxxx are
mm-fake-numa-handle-cases-with-no-srat-info.patch
