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From: madhuparnabhowmik10@gmail.com
To: bfields@fieldses.org, chuck.lever@oracle.com
Cc: linux-nfs@vger.kernel.org, paulmck@kernel.org,
	linux-kernel@vger.kernel.org,
	Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>,
	joel@joelfernandes.org,
	linux-kernel-mentees@lists.linuxfoundation.org
Subject: [Linux-kernel-mentees] [PATCH] fs: nfsd: fileache.c: Use built-in RCU list checking
Date: Thu, 13 Feb 2020 20:33:59 +0530
Message-ID: <20200213150359.5819-1-madhuparnabhowmik10@gmail.com> (raw)

From: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>

list_for_each_entry_rcu() has built-in RCU and lock checking.

Pass cond argument to list_for_each_entry_rcu() to silence
false lockdep warning when  CONFIG_PROVE_RCU_LIST is enabled
by default.

Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
---
 fs/nfsd/filecache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 32a9bf22ac08..547d2d8bde62 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -736,7 +736,7 @@ nfsd_file_find_locked(struct inode *inode, unsigned int may_flags,
 	unsigned char need = may_flags & NFSD_FILE_MAY_MASK;
 
 	hlist_for_each_entry_rcu(nf, &nfsd_file_hashtbl[hashval].nfb_head,
-				 nf_node) {
+				 nf_node, lockdep_is_held(&nfsd_file_hashtbl[hashval].nfb_lock)) {
 		if ((need & nf->nf_may) != need)
 			continue;
 		if (nf->nf_inode != inode)
-- 
2.17.1

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