« Return to Thread: [PATCH -mm 1/2] rename is_single_threaded(task) to is_current_single_threaded(void)

Re: [PATCH v2 -mm 2/2] current_is_single_threaded: don't use ->mmap_sem

by James Morris-2 :: Rate this Message:

On Fri, 10 Jul 2009, David Howells wrote:

> > However we can avoid ->mmap_sem and rely on rcu/barriers:
> >
> > - if we do not see the exiting parent on thread/process list
> > we see the result of list_del_rcu(), in this case we must
> > also see the result of list_add_rcu() which does wmb().
> >
> > - if we do see the parent but its ->mm == NULL, we need rmb()
> > to make sure we can't miss the child.
> >
> > Signed-off-by: Oleg Nesterov <oleg@...>
>
> Acked-by: David Howells <dhowells@...>

I gather this stuff is going into -mm ?

Can it be merged via security-testing#next?

--
James Morris
<jmorris@...>
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« Return to Thread: [PATCH -mm 1/2] rename is_single_threaded(task) to is_current_single_threaded(void)