On Wed, Nov 12, 2014 at 6:23 AM, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > On Thu, 06 Nov 2014 16:08:02 +0800 Weijie Yang <weijie.yang@xxxxxxxxxxx> wrote: > >> In the undo path of start_isolate_page_range(), we need to check >> the pfn validity before access its page, or it will trigger an >> addressing exception if there is hole in the zone. >> > > There is not enough information in the chagnelog for me to decide how > to handle the patch. 3.19? 3.18? 3.18+stable? > > When fixing bugs, please remember to fully explain the end-user impact > of the bug. Under what circumstances does it occur? I'm sorry to disturb you. This issue is found by code-review not a test-trigger. In "CONFIG_HOLES_IN_ZONE" environment, there is a certain chance that it would casue an addressing exception when start_isolate_page_range() fails, this could affect CMA, hugepage and memory-hotplug function. -- 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>