Re: [PATCH v6 4/4] of/fdt: mark hotpluggable memory

When movable nodes are enabled, any node containing only hotpluggable
memory is made movable at boot time.

On x86, hotpluggable memory is discovered by parsing the ACPI SRAT,
making corresponding calls to memblock_mark_hotplug().

If we introduce a dt property to describe memory as hotpluggable,
configs supporting early fdt may then also do this marking and use
movable nodes.

Signed-off-by: Reza Arbab <redacted>
---
 drivers/of/fdt.c | 6 ++++++
 mm/Kconfig       | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index c89d5d2..2cf1d66 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c

@@ -1015,6 +1015,7 @@ int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
        const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
        const __be32 *reg, *endp;
        int l;
+       bool hotpluggable;

        /* We are scanning "memory" nodes only */
        if (type == NULL) {

@@ -1034,6 +1035,7 @@ int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
                return 0;

        endp = reg + (l / sizeof(__be32));
+       hotpluggable = of_get_flat_dt_prop(node, "linux,hotpluggable", NULL);