On Thu, Aug 11, 2016 at 05:44:46PM +0800, Xishi Qiu wrote: > arm64: > SECTION_SIZE_BITS 30 -----1G > > The memory hotplug(add_memory -->check_hotplug_memory_range) > must be aligned with section.So I can not add mem with 64M ... > Can I modify the SECTION_SIZE_BITS to 26? There was a patch to reduce this to 27: http://lkml.kernel.org/g/1465821119-3384-1-git-send-email-jszhang@xxxxxxxxxxx Also some discussions in this thread on a different patch: http://lkml.iu.edu/hypermail/linux/kernel/1604.1/03036.html Does your system really have such small alignment memory blocks? -- Catalin -- 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>