On Mon, Nov 18, 2019 at 11:26:07AM +0800, zhong jiang wrote:
> The commit 391d4ee568b5 ("memfd: Fix locking when tagging pins")
> introduces the following warning messages.
>
> *WARNING: suspicious RCU usage in memfd_wait_for_pins*
>
> It is because we still use radix_tree_deref_slot without read_rcu_lock.
> We should use radix_tree_deref_slot_protected instead in the case.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: 391d4ee568b5 ("memfd: Fix locking when tagging pins")
> Signed-off-by: zhong jiang <zhongjiang@xxxxxxxxxx>
Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
