During early boot-up, iomem_resource is set up from the boot
descriptor table, such as EFI Memory Table and e820. Later,
acpi_memory_device_add() calls add_memory() for each ACPI
memory device object as it enumerates ACPI namespace. This
add_memory() call is expected to fail in register_memory_resource()
at boot since iomem_resource has been set up from EFI/e820.
As a result, add_memory() returns -EEXIST, which
acpi_memory_device_add() handles as the normal case.
This scheme works fine, but the following error message is
logged for every ACPI memory device object during boot-up.
"System RAM resource %pR cannot be added\n"
This patch changes register_memory_resource() to use pr_debug()
for the message as it shows up under the normal case.
Signed-off-by: Toshi Kani <[email protected]>
---
mm/memory_hotplug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 5ea1287..90ebc91 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -75,7 +75,7 @@ static struct resource *register_memory_resource(u64 start, u64 size)
res->end = start + size - 1;
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
if (request_resource(&iomem_resource, res) < 0) {
- printk("System RAM resource %pR cannot be added\n", res);
+ pr_debug("System RAM resource %pR cannot be added\n", res);
kfree(res);
res = NULL;
}