v4.19.13 snapshot.
diff --git a/arch/powerpc/lib/alloc.c b/arch/powerpc/lib/alloc.c
new file mode 100644
index 0000000..06796de
--- /dev/null
+++ b/arch/powerpc/lib/alloc.c
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/bootmem.h>
+#include <linux/string.h>
+#include <asm/setup.h>
+
+
+void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
+{
+ void *p;
+
+ if (slab_is_available())
+ p = kzalloc(size, mask);
+ else {
+ p = memblock_virt_alloc(size, 0);
+ }
+ return p;
+}