Re: [PATCH 4.19] memfd: Use radix_tree_deref_slot_protected to avoid the warning.

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On Mon, Nov 18, 2019 at 11:26:08AM +0800, zhong jiang wrote:
> The commit 99b45e7a1ba1 ("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: 99b45e7a1ba1 ("memfd: Fix locking when tagging pins")
> Signed-off-by: zhong jiang <zhongjiang@xxxxxxxxxx>

Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>





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