On 02/24/2012 07:20 AM, Christoph Lameter wrote: > Subject: migration: Do not do rcu_read_unlock until the last time we need the task_struct pointer > > Migration functions perform the rcu_read_unlock too early. As a result the > task pointed to may change. Bugs were introduced when adding security checks > because rcu_unlock/lock sequences were inserted. Plus the security checks > and do_move_pages used the task_struct pointer after rcu_unlock. > > Fix those issues by removing the unlock/lock sequences and moving the > rcu_read_unlock after the last use of the task struct pointer. > > Signed-off-by: Christoph Lameter <cl@xxxxxxxxx> It doesn't fix the code duplication, but it definitely does fix the bug I was originally trying to address. Acked-by: Dave Hansen <dave@xxxxxxxxxxxxxxxxxx> -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>