linux-kernel - [PATCH] fs: nfsd: nfs4state.c: Use built-in RCU list checking

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Message-Id: <20200213150331.5727-1-madhuparnabhowmik10@gmail.com>
Date:   Thu, 13 Feb 2020 20:33:31 +0530
From:   madhuparnabhowmik10@...il.com
To:     bfields@...ldses.org, chuck.lever@...cle.com
Cc:     linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        joel@...lfernandes.org, frextrite@...il.com,
        linux-kernel-mentees@...ts.linuxfoundation.org, paulmck@...nel.org,
        Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
Subject: [PATCH] fs: nfsd: nfs4state.c: Use built-in RCU list checking

From: Madhuparna Bhowmik <madhuparnabhowmik10@...il.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@...il.com>
---
 fs/nfsd/nfs4state.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 369e574c5092..3a80721fe53d 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4295,7 +4295,8 @@ find_file_locked(struct knfsd_fh *fh, unsigned int hashval)
 {
 	struct nfs4_file *fp;
 
-	hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash) {
+	hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash,
+				lockdep_is_held(&state_lock)) {
 		if (fh_match(&fp->fi_fhandle, fh)) {
 			if (refcount_inc_not_zero(&fp->fi_ref))
 				return fp;
-- 
2.17.1