Re: [PATCH -mm -next] ipc,sem: untangle RCU locking with find_alloc_undo

[Michel Lespinasse]

On Thu, Mar 28, 2013 at 8:32 AM, Rik van Riel <riel@xxxxxxxxxxx> wrote:
> The ipc semaphore code has a nasty RCU locking tangle, with both
> find_alloc_undo and semtimedop taking the rcu_read_lock(). The
> code can be cleaned up somewhat by only taking the rcu_read_lock
> once.
>
> The only caller of find_alloc_undo is in semtimedop.
>
> This should solve the trinity issue reported by Sasha Levin.
>
> Reported-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
> Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>

Looks good^Wbetter. I have nothing specific to say other than I've
been staring at it for 10 minutes :)

Reviewed-by: Michel Lespinasse <walken@xxxxxxxxxx>

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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