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-rw-r--r--kernel/resource.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/resource.c b/kernel/resource.c
index ca7ed5158cff..35fe105d581e 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -1132,6 +1132,15 @@ struct resource * __request_region(struct resource *parent,
conflict = __request_resource(parent, res);
if (!conflict)
break;
+ /*
+ * mm/hmm.c reserves physical addresses which then
+ * become unavailable to other users. Conflicts are
+ * not expected. Warn to aid debugging if encountered.
+ */
+ if (conflict->desc == IORES_DESC_DEVICE_PRIVATE_MEMORY) {
+ pr_warn("Unaddressable device %s %pR conflicts with %pR",
+ conflict->name, conflict, res);
+ }
if (conflict != parent) {
if (!(conflict->flags & IORESOURCE_BUSY)) {
parent = conflict;