Messages in this thread | | | Date | Fri, 24 Feb 2012 10:54:15 -0600 (CST) | From | Christoph Lameter <> | Subject | Re: [RFC][PATCH] fix move/migrate_pages() race on task struct |
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On Fri, 24 Feb 2012, Dave Hansen wrote:
> 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@linux.com> > > It doesn't fix the code duplication, but it definitely does fix the bug
Yes I did not want to override all your good work.
Could you do another patch that removed the duplication?
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