From: Yasunori Goto This is to remove noisy useless message at boot. The message is a ton of "ACPI Exception (acpi_memory-0492): AE_ERROR, handle is no memory device" In my emulation, number of memory devices are not so many (only 6), but, this messages are displayed 114 times. It is showed by acpi_memory_register_notify_handler() which is called by acpi_walk_namespace(). acpi_walk_namespace() parses all of ACPI's namespace and execute acpi_memory_register_notify_handler(). So, it is called for all of the device which is defined in namespace. If the parsing device is not memory, acpi_memhotplug ignores it due to "no match" and will parse next device. This is normal route. But this message says it is exception. It is meaningless. Signed-off-by: Yasunori Goto Cc: "Brown, Len" Cc: "Yu, Luming" Signed-off-by: Andrew Morton --- drivers/acpi/acpi_memhotplug.c | 8 ++------ 1 files changed, 2 insertions(+), 6 deletions(-) diff -puN drivers/acpi/acpi_memhotplug.c~acpi-memory-hotplug-remove-useless-message-at-boot-time drivers/acpi/acpi_memhotplug.c --- a/drivers/acpi/acpi_memhotplug.c~acpi-memory-hotplug-remove-useless-message-at-boot-time +++ a/drivers/acpi/acpi_memhotplug.c @@ -488,10 +488,8 @@ acpi_memory_register_notify_handler(acpi status = is_memory_device(handle); - if (ACPI_FAILURE(status)){ - ACPI_EXCEPTION((AE_INFO, status, "handle is no memory device")); + if (ACPI_FAILURE(status)) return AE_OK; /* continue */ - } status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, acpi_memory_device_notify, NULL); @@ -507,10 +505,8 @@ acpi_memory_deregister_notify_handler(ac status = is_memory_device(handle); - if (ACPI_FAILURE(status)){ - ACPI_EXCEPTION((AE_INFO, status, "handle is no memory device")); + if (ACPI_FAILURE(status)) return AE_OK; /* continue */ - } status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, _