Re: [PATCH] softlockup: convert read_lock in hung_task to rcu_read_lock

[Ingo Molnar <mingo@elte.hu>]

* Mandeep Singh Baines <msb@google.com> wrote:

> Ingo Molnar (mingo@elte.hu) wrote:
> > 
> > I've applied your patch to tip:core/softlockup, thanks Mandeep!
> > 
> 
> Oops, I put the conversion to rcu_read_lock in a seperate patch. I
> understand now the convention is to use a patch series only when the
> patches can be applied independently.

What you did is in fact the preferred approach: keep independent stuff 
independent and make patches as gradual and split-up as possible. (as long 
as the interim state is a working kernel too)

> ---
> Since the tasklist is protected by rcu list operations, it is safe
> to convert the read_lock()s to rcu_read_lock().
> 
> Suggested-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
> Signed-off-by: Mandeep Singh Baines <msb@google.com>
> ---
>  kernel/hung_task.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)

Applied to tip:core/softlockup, thanks!

	Ingo