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From: Matthew Wilcox <willy@infradead.org>
To: zhong jiang <zhongjiang@huawei.com>
Cc: sashal@kernel.org, gregkh@linuxfoundation.org,
	stable@vger.kernel.org, linux-mm@kvack.org,
	yangyingliang@huawei.com
Subject: Re: [PATCH 4.4] memfd: Use radix_tree_deref_slot_protected to avoid the warning.
Date: Mon, 18 Nov 2019 04:25:22 -0800	[thread overview]
Message-ID: <20191118122522.GJ20752@bombadil.infradead.org> (raw)
In-Reply-To: <20191118032610.182862-3-zhongjiang@huawei.com>

On Mon, Nov 18, 2019 at 11:26:09AM +0800, zhong jiang wrote:
> The commit eb4058d8daf8 ("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@vger.kernel.org
> Fixes: eb4058d8daf8 ("memfd: Fix locking when tagging pins")
> Signed-off-by: zhong jiang <zhongjiang@huawei.com>

Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>


  reply	other threads:[~2019-11-18 12:25 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-18  3:26 [PATCH 4.14] memfd: Use radix_tree_deref_slot_protected to avoid the warning zhong jiang
2019-11-18  3:26 ` [PATCH 4.19] " zhong jiang
2019-11-18 12:25   ` Matthew Wilcox
2019-11-19  5:00   ` Patch "memfd: Use radix_tree_deref_slot_protected to avoid the warning." has been added to the 4.19-stable tree gregkh
2019-11-18  3:26 ` [PATCH 4.4] memfd: Use radix_tree_deref_slot_protected to avoid the warning zhong jiang
2019-11-18 12:25   ` Matthew Wilcox [this message]
2019-11-19  4:59   ` Patch "memfd: Use radix_tree_deref_slot_protected to avoid the warning." has been added to the 4.4-stable tree gregkh
2019-11-18  3:26 ` [PATCH 4.9] memfd: Use radix_tree_deref_slot_protected to avoid the warning zhong jiang
2019-11-18 12:25   ` Matthew Wilcox
2019-11-19  4:59   ` Patch "memfd: Use radix_tree_deref_slot_protected to avoid the warning." has been added to the 4.9-stable tree gregkh
2019-11-18 12:24 ` [PATCH 4.14] memfd: Use radix_tree_deref_slot_protected to avoid the warning Matthew Wilcox
2019-11-19  4:59 ` Patch "memfd: Use radix_tree_deref_slot_protected to avoid the warning." has been added to the 4.14-stable tree gregkh

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