On Wed, 19 Nov 2014 08:21:39 +0900 Minchan Kim <minchan@xxxxxxxxxx> wrote: > Main reason I sent the patch is I got a subtle bug when I implement > new feature of zsmalloc(ie, compaction) due to link's mishandling > (ie, link was over page boundary by my fault). > Although it was totally my mistake, it took time for a while > to find a root cause because unpredictable kmapped address should > be unmapped so it's almost random crash. Fair enough. That's pretty rude behaviour from kunmap_atomic(). Unfortunately it just doesn't have anything with which to check the address - we'd need to create a special per-cpu array[KM_TYPE_NR] just for the purpose. -- 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>