On Wed, Jul 17, 2013 at 5:45 PM, Toshi Kani <toshi.kani@xxxxxx> wrote: > CONFIG_ARCH_MEMORY_PROBE enables /sys/devices/system/memory/probe > interface, which allows a given memory address to be hot-added as > follows. (See Documentation/memory-hotplug.txt for more detail.) > > # echo start_address_of_new_memory > /sys/devices/system/memory/probe > > This probe interface is required on powerpc. On x86, however, ACPI > notifies a memory hotplug event to the kernel, which performs its > hotplug operation as the result. Therefore, users should not be > required to use this interface on x86. This probe interface is also > error-prone that the kernel blindly adds a given memory address > without checking if the memory is present on the system; no probing > is done despite of its name. The kernel crashes when a user requests > to online a memory block that is not present on the system. > > This patch disables CONFIG_ARCH_MEMORY_PROBE by default on x86, > and clarifies it in Documentation/memory-hotplug.txt. Why don't you completely remove it? Who should use this strange interface? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>