Re: [Xen-devel] rwlock and per-cpu rwlock recursive?

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 02/28/2018 11:18 AM, Jan Beulich wrote:
> > > > On 28.02.18 at 11:28, <julien.grall@xxxxxxx> wrote:
> > Looking at the implementation, I see recursion handling for
> > mm_write_lock but not for mm_read_lock. Can you confirm that only the
> > write lock can be taken recursively?
> If by "write lock" you mean an arbitrary one, then the answer of
> course is no. The mm write lock machinery adds recursiveness
> around percpu_write_lock(). See e.g. _mm_write_lock().
By "write lock", I meant mm_write_lock(). Thank you for the 
confirmation, so mm_read_lock() is not recursive.
Cheers,

--
Julien Grall

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