On Thu, Mar 9, 2017 at 2:22 PM, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote: > On Thursday, March 09, 2017 11:15:47 PM Rafael J. Wysocki wrote: >> On Thursday, March 09, 2017 10:10:31 AM Dan Williams wrote: >> > On Thu, Mar 9, 2017 at 5:39 AM, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote: [..] >> > I *think* we're ok in this case because unplugging the CPU package >> > that contains a persistent memory device will trigger >> > devm_memremap_pages() to call arch_remove_memory(). Removing a pmem >> > device can't fail. It may be held off while pages are pinned for DMA >> > memory, but it will eventually complete. >> >> What about the offlining, though? Is it guaranteed that no memory from those >> ranges will go back online after the acpi_scan_try_to_offline() call in >> acpi_scan_hot_remove()? > > My point is that after the acpi_evaluate_ej0() in acpi_scan_hot_remove() the > hardware is physically gone, so if anything is still doing DMA to that memory at > that point, then the user is going to be unhappy. Hmm, ACPI 6.1 does not have any text about what _EJ0 means for ACPI0012. -- 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>
