On 6/6/19 11:44 AM, Jason Gunthorpe wrote:
> From: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
>
> This list is always read and written while holding hmm->lock so there is
> no need for the confusing _rcu annotations.
>
> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
> Reviewed-by: Jérôme Glisse <jglisse@xxxxxxxxxx>
> ---
> mm/hmm.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/mm/hmm.c b/mm/hmm.c
> index c2fecb3ecb11e1..709d138dd49027 100644
> --- a/mm/hmm.c
> +++ b/mm/hmm.c
> @@ -911,7 +911,7 @@ int hmm_range_register(struct hmm_range *range,
> mutex_lock(&hmm->lock);
>
> range->hmm = hmm;
> - list_add_rcu(&range->list, &hmm->ranges);
> + list_add(&range->list, &hmm->ranges);
>
> /*
> * If there are any concurrent notifiers we have to wait for them for
> @@ -941,7 +941,7 @@ void hmm_range_unregister(struct hmm_range *range)
> return;
>
> mutex_lock(&hmm->lock);
> - list_del_rcu(&range->list);
> + list_del(&range->list);
> mutex_unlock(&hmm->lock);
>
> /* Drop reference taken by hmm_range_register() */
>
Good point. I'd overlooked this many times.
Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>
thanks,
--
John Hubbard
NVIDIA
